vpruthi/doc-exports
1
0
Fork 0
forked from docs/doc-exports
Code Pull Requests Activity
doc-exports/docs/dws/dev/dws_06_0341.html
Lu, Huayi e6fa411af0 DWS DEV 830.201 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:24:04 +00:00

718 lines
101 KiB
HTML
Raw Blame History

<a name="EN-US_TOPIC_0000001495991693"></a><a name="EN-US_TOPIC_0000001495991693"></a>
<h1 class="topictitle1">System Catalog Information Functions</h1>
<div id="body0000001495991693"><div class="section" id="EN-US_TOPIC_0000001495991693__section17815173014118"><h4 class="sectiontitle">format_type(type_oid, typemod)</h4><p id="EN-US_TOPIC_0000001495991693__p881393044116">Description: Gets SQL name of a data type.</p>
<p id="EN-US_TOPIC_0000001495991693__p281323084115">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p08138308415">Note:</p>
<p id="EN-US_TOPIC_0000001495991693__p9813133014111"><strong id="EN-US_TOPIC_0000001495991693__b87300319794254">format_type</strong> returns the SQL name of a data type that is identified by its type OID and possibly a type modifier. Pass NULL for the type modifier if no specific modifier is known. Certain type modifiers are passed for data types with length limitations. The SQL name returned from <strong id="EN-US_TOPIC_0000001495991693__b52932945894254">format_type</strong> contains the length of the data type, which can be calculated by taking sizeof(int32) from actual storage length [actual storage len - sizeof(int32)] in the unit of bytes. 32-bit space is required to store the customized length set by users. So the actual storage length contains 4 bytes more than the customized length. In the following example, the SQL name returned from <strong id="EN-US_TOPIC_0000001495991693__b149432780694254">format_type</strong> is character varying(6), indicating the length of varchar type is 6 bytes. So the actual storage length of varchar type is 10 bytes.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen6815123064115"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">format_type</span><span class="p">((</span><span class="k">SELECT</span><span class="w"> </span><span class="n">oid</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_type</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">typname</span><span class="o">=</span><span class="s1">'varchar'</span><span class="p">),</span><span class="w"> </span><span class="mi">10</span><span class="p">);</span>
<span class="w"> </span><span class="n">format_type</span><span class="w"> </span>
<span class="c1">----------------------</span>
<span class="w"> </span><span class="nb">character</span><span class="w"> </span><span class="nb">varying</span><span class="p">(</span><span class="mi">6</span><span class="p">)</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1258872611417"><h4 class="sectiontitle">pg_check_authid(role_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p55881026114118">Description: Check whether a role name with given OID exists.</p>
<p id="EN-US_TOPIC_0000001495991693__p85881026114116">Return type: Boolean</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section47744234414"><h4 class="sectiontitle">pg_describe_object(catalog_id, object_id, object_sub_id)</h4><p id="EN-US_TOPIC_0000001495991693__p2077432311417">Description: Gets description of a database object.</p>
<p id="EN-US_TOPIC_0000001495991693__p1177411232411">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p1477412319417">Note: <strong id="EN-US_TOPIC_0000001495991693__b174418596894254">pg_describe_object</strong> returns a description of a database object specified by catalog OID, object OID and a (possibly zero) sub-object ID. This is useful to determine the identity of an object as stored in the <strong id="EN-US_TOPIC_0000001495991693__b84805981994254">pg_depend</strong> catalog.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section6266020134116"><h4 class="sectiontitle">pg_get_constraintdef(constraint_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p10266162014117">Description: Gets definition of a constraint.</p>
<p id="EN-US_TOPIC_0000001495991693__p1726672044110">Return type: text</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section7871517174110"><h4 class="sectiontitle">pg_get_constraintdef(constraint_oid, pretty_bool)</h4><p id="EN-US_TOPIC_0000001495991693__p28771784119">Description: Gets definition of a constraint.</p>
<p id="EN-US_TOPIC_0000001495991693__p58751714111">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p38781754112">Note: <strong id="EN-US_TOPIC_0000001495991693__b176268041294254">pg_get_constraintdef</strong> and <strong id="EN-US_TOPIC_0000001495991693__b145282403794254">pg_get_indexdef</strong> respectively reconstruct the creating command for a constraint and an index. </p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section851731434111"><h4 class="sectiontitle">pg_get_expr(pg_node_tree, relation_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p115176141412">Description: Decompiles internal form of an expression, assuming that any Vars in it refer to the relationship indicated by the second parameter.</p>
<p id="EN-US_TOPIC_0000001495991693__p7517171414418">Return type: text</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1785461174115"><h4 class="sectiontitle">pg_get_expr(pg_node_tree, relation_oid, pretty_bool)</h4><p id="EN-US_TOPIC_0000001495991693__p14853511134120">Description: Decompiles internal form of an expression, assuming that any Vars in it refer to the relationship indicated by the second parameter.</p>
<p id="EN-US_TOPIC_0000001495991693__p1185441174117">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p128541411174114">Note: <strong id="EN-US_TOPIC_0000001495991693__b66044276194254">pg_get_expr</strong> decompiles the internal form of an individual expression, such as the default value for a column. It can be useful when examining the contents of system catalogs. If the expression might contain Vars, specify the OID of the relationship they refer to as the second parameter; if no Vars are expected, zero is sufficient.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1045145354014"><h4 class="sectiontitle">pg_get_indexdef(index_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p16450155354019">Description: Gets <strong id="EN-US_TOPIC_0000001495991693__b46487359194254">CREATE INDEX</strong> command for index.</p>
<p id="EN-US_TOPIC_0000001495991693__p16450135314403">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p1045195316404"><strong id="EN-US_TOPIC_0000001495991693__b447685919356">index_oid</strong> indicates the index OID, which can be queried in the PG_STATIO_ALL_INDEXES system view.</p>
<p id="EN-US_TOPIC_0000001495991693__p64511553134020">Example: Query the OID and CREATE INDEX command of <strong id="EN-US_TOPIC_0000001495991693__b151610407994254">index ds_ship_mode_t1_index1</strong>.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen12451953144014"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">indexrelid</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">PG_STATIO_ALL_INDEXES</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">indexrelname</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'ds_ship_mode_t1_index1'</span><span class="p">;</span>
<span class="w"> </span><span class="n">indexrelid</span>
<span class="c1">------------</span>
<span class="w"> </span><span class="mi">136035</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
<span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_get_indexdef</span><span class="p">(</span><span class="mi">136035</span><span class="p">);</span>
<span class="w"> </span><span class="n">pg_get_indexdef</span>
<span class="c1">---------------------------------------------------------------------------------------------------------------</span>
<span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">ds_ship_mode_t1_index1</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">tpcds</span><span class="p">.</span><span class="n">ship_mode_t1</span><span class="w"> </span><span class="k">USING</span><span class="w"> </span><span class="n">psort</span><span class="w"> </span><span class="p">(</span><span class="n">sm_ship_mode_sk</span><span class="p">)</span><span class="w"> </span><span class="n">TABLESPACE</span><span class="w"> </span><span class="n">pg_default</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1455964824019"><h4 class="sectiontitle">pg_get_indexdef(index_oid, column_no, pretty_bool)</h4><p id="EN-US_TOPIC_0000001495991693__p19558194815405">Description: Gets <strong id="EN-US_TOPIC_0000001495991693__b206044465194254">CREATE INDEX</strong> command for index, or definition of just one index column when <strong id="EN-US_TOPIC_0000001495991693__b172050372094254">column_no</strong> is not zero.</p>
<p id="EN-US_TOPIC_0000001495991693__p1255815489400">Return type: text</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen555934820401"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_get_indexdef</span><span class="p">(</span><span class="mi">136035</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="k">false</span><span class="p">);</span>
<span class="w"> </span><span class="n">pg_get_indexdef</span>
<span class="c1">---------------------------------------------------------------------------------------------------------------</span>
<span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">ds_ship_mode_t1_index1</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">tpcds</span><span class="p">.</span><span class="n">ship_mode_t1</span><span class="w"> </span><span class="k">USING</span><span class="w"> </span><span class="n">psort</span><span class="w"> </span><span class="p">(</span><span class="n">sm_ship_mode_sk</span><span class="p">)</span><span class="w"> </span><span class="n">TABLESPACE</span><span class="w"> </span><span class="n">pg_default</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
<span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_get_indexdef</span><span class="p">(</span><span class="mi">136035</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="k">false</span><span class="p">);</span>
<span class="w"> </span><span class="n">pg_get_indexdef</span>
<span class="c1">-----------------</span>
<span class="w"> </span><span class="n">sm_ship_mode_sk</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1378684410407"><h4 class="sectiontitle">pg_get_keywords()</h4><p id="EN-US_TOPIC_0000001495991693__p157864448401">Description: Gets list of SQL keywords and their categories.</p>
<p id="EN-US_TOPIC_0000001495991693__p177865443403">Return type: SETOF record</p>
<p id="EN-US_TOPIC_0000001495991693__p6786164419403">Note: <strong id="EN-US_TOPIC_0000001495991693__b185940057894254">pg_get_keywords</strong> returns a set of records describing the SQL keywords recognized by the server. The <strong id="EN-US_TOPIC_0000001495991693__b196316958394254">word</strong> column contains the keyword. The <strong id="EN-US_TOPIC_0000001495991693__b66105584194254">catcode</strong> column contains a category code: <strong id="EN-US_TOPIC_0000001495991693__b195056538794254">U</strong> for unreserved, <strong id="EN-US_TOPIC_0000001495991693__b169044594694254">C</strong> for column name, <strong id="EN-US_TOPIC_0000001495991693__b181540755694254">T</strong> for type or function name, or <strong id="EN-US_TOPIC_0000001495991693__b208936416294254">R</strong> for reserved. The <strong id="EN-US_TOPIC_0000001495991693__b31252256394254">catdesc</strong> column contains a possibly-localized string describing the category.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1299594014013"><h4 class="sectiontitle">pg_get_ruledef(rule_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p1099412401400">Description: Gets <strong id="EN-US_TOPIC_0000001495991693__b97987281394254">CREATE RULE</strong> command for a rule.</p>
<p id="EN-US_TOPIC_0000001495991693__p999564011402">Return type: text</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1526553813402"><h4 class="sectiontitle">pg_get_ruledef(rule_oid, pretty_bool)</h4><p id="EN-US_TOPIC_0000001495991693__p2265143817405">Description: Gets <strong id="EN-US_TOPIC_0000001495991693__b199637866094254">CREATE RULE</strong> command for a rule.</p>
<p id="EN-US_TOPIC_0000001495991693__p1426510388406">Return type: text</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section6706153484019"><h4 class="sectiontitle">pg_get_userbyid(role_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p20706113444017">Description: Gets role name with given OID.</p>
<p id="EN-US_TOPIC_0000001495991693__p67061034124014">Return type: name</p>
<p id="EN-US_TOPIC_0000001495991693__p1706153412405">Note: <strong id="EN-US_TOPIC_0000001495991693__b120654753994254">pg_get_userbyid</strong> extracts a role's name given its OID.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section19949731154016"><h4 class="sectiontitle">pg_get_viewdef(viewname text [, pretty bool [, fullflag bool]])</h4><p id="EN-US_TOPIC_0000001495991693__p894811315408">Description: gets underlying <strong id="EN-US_TOPIC_0000001495991693__b44319819094254">SELECT</strong> command for views.</p>
<p id="EN-US_TOPIC_0000001495991693__p1894817317406">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p69487317409">Note:</p>
<ul id="EN-US_TOPIC_0000001495991693__ul1794915318402"><li id="EN-US_TOPIC_0000001495991693__li109496318407"><strong id="EN-US_TOPIC_0000001495991693__b50364336894254">pg_get_viewdef</strong> reconstructs the <strong id="EN-US_TOPIC_0000001495991693__b152249402494254">SELECT</strong> query that defines a view. If the value of <strong id="EN-US_TOPIC_0000001495991693__b133604829794254">pretty bool</strong> is set to <strong id="EN-US_TOPIC_0000001495991693__b18744941994254">true</strong>, the display format is suitable for printing and more readable. The default value of <strong id="EN-US_TOPIC_0000001495991693__b118073682894254">pretty bool</strong> is <strong id="EN-US_TOPIC_0000001495991693__b152302206294254">false</strong>, and the display format is not readable. Use the default format for dump purposes whenever possible. The <strong id="EN-US_TOPIC_0000001495991693__b105106315794254">pretty bool</strong> parameter can be applied only to valid views.</li><li id="EN-US_TOPIC_0000001495991693__li13949163134013">When <strong id="EN-US_TOPIC_0000001495991693__b90033792594254">fullflag bool</strong> is set to <strong id="EN-US_TOPIC_0000001495991693__b81179534694254">true</strong>, the complete definition of the view is displayed. The default value is <strong id="EN-US_TOPIC_0000001495991693__b39287543994254">false</strong>.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section2046462874019"><h4 class="sectiontitle">pg_get_viewdef(viewoid oid [, pretty bool [, fullflag bool]])</h4><p id="EN-US_TOPIC_0000001495991693__p1646432811400">Description: gets underlying <strong id="EN-US_TOPIC_0000001495991693__b114539825494254">SELECT</strong> command for views.</p>
<p id="EN-US_TOPIC_0000001495991693__p84641728174019">Return type: text</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section0855825114014"><h4 class="sectiontitle">pg_get_viewdef(view_oid, wrap_column_int)</h4><p id="EN-US_TOPIC_0000001495991693__p20855182512404">Description: Gets underlying SELECT command for view, wrapping lines with columns as specified, printing is implied.</p>
<p id="EN-US_TOPIC_0000001495991693__p98551525134011">Return type: text</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1589152111402"><h4 class="sectiontitle">pg_get_tabledef(table_oid)</h4><p id="EN-US_TOPIC_0000001495991693__p88906215407">Description: Obtains a table definition based on <strong id="EN-US_TOPIC_0000001495991693__b55826584594254">table_oid</strong>.</p>
<p id="EN-US_TOPIC_0000001495991693__p1989010211406">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p589020211409">Example: Obtain the OID of the table <strong id="EN-US_TOPIC_0000001495991693__b28892554694254">customer_t2</strong> from the system catalog <strong id="EN-US_TOPIC_0000001495991693__b82100337594254">pg_class</strong>, and then use this function to query the definition of <strong id="EN-US_TOPIC_0000001495991693__b155660402194254">customer_t2</strong> to obtain the table columns, storage mode (row-store or column-store), and table distribution mode configured for <strong id="EN-US_TOPIC_0000001495991693__b62070737294254">customer_t2</strong> when it is created.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen789122164019"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">oid</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_class</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">relname</span><span class="w"> </span><span class="o">=</span><span class="s1">'customer_t2'</span><span class="p">;</span>
<span class="w"> </span><span class="n">oid</span>
<span class="c1">-------</span>
<span class="w"> </span><span class="mi">17353</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
<span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_get_tabledef</span><span class="p">(</span><span class="mi">17353</span><span class="p">);</span>
<span class="w"> </span><span class="n">pg_get_tabledef</span>
<span class="c1">--------------------------------------------</span>
<span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">search_path</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">dbadmin</span><span class="p">;</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">customer_t2</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">state_id</span><span class="w"> </span><span class="nb">character</span><span class="p">(</span><span class="mi">2</span><span class="p">),</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">state_name</span><span class="w"> </span><span class="nb">character</span><span class="w"> </span><span class="nb">varying</span><span class="p">(</span><span class="mi">40</span><span class="p">),</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">area_id</span><span class="w"> </span><span class="nb">numeric</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="n">orientation</span><span class="o">=</span><span class="k">column</span><span class="p">,</span><span class="w"> </span><span class="n">compression</span><span class="o">=</span><span class="n">low</span><span class="p">)</span><span class="o">+</span>
<span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="p">(</span><span class="n">state_id</span><span class="p">)</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="k">TO</span><span class="w"> </span><span class="k">GROUP</span><span class="w"> </span><span class="n">group_version1</span><span class="p">;</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section463171813401"><h4 class="sectiontitle">pg_get_tabledef(table_name)</h4><p id="EN-US_TOPIC_0000001495991693__p1763718194017">Description: Obtains a table definition based on <strong id="EN-US_TOPIC_0000001495991693__b194619812694254">table_name</strong>.</p>
<p id="EN-US_TOPIC_0000001495991693__p136318186408">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p36312187407">Remarks: <strong id="EN-US_TOPIC_0000001495991693__b53681948694254">pg_get_tabledef</strong> reconstructs the <strong id="EN-US_TOPIC_0000001495991693__b167444565594254">CREATE</strong> statement of the table definition, including the table definition, index information, and comments. Users need to create the dependent objects of the table, such as groups, schemas, tablespaces, and servers. The table definition does not include the statements for creating these dependent objects.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section38200141403"><h4 class="sectiontitle">pg_options_to_table(reloptions)</h4><p id="EN-US_TOPIC_0000001495991693__p4820101494013">Description: Gets the set of storage option name/value pairs.</p>
<p id="EN-US_TOPIC_0000001495991693__p3820121415408">Return type: SETOF record</p>
<p id="EN-US_TOPIC_0000001495991693__p682019143409">Note: <strong id="EN-US_TOPIC_0000001495991693__b24150311994254">pg_options_to_table</strong> returns the set of storage option name/value pairs (<strong id="EN-US_TOPIC_0000001495991693__b68180287294254">option_name</strong>/<strong id="EN-US_TOPIC_0000001495991693__b168867058694254">option_value</strong>) when passing <strong id="EN-US_TOPIC_0000001495991693__b94093289294254">pg_class.reloptions</strong> or <strong id="EN-US_TOPIC_0000001495991693__b51237347494254">pg_attribute.attoptions</strong>.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section841817464019"><h4 class="sectiontitle">pg_typeof(any)</h4><p id="EN-US_TOPIC_0000001495991693__p54175484010">Description: Gets the data type of any value.</p>
<p id="EN-US_TOPIC_0000001495991693__p54183415408">Return type: regtype</p>
<p id="EN-US_TOPIC_0000001495991693__p14181345409">Note:</p>
<p id="EN-US_TOPIC_0000001495991693__p941810411405"><strong id="EN-US_TOPIC_0000001495991693__b64914746294254">pg_typeof</strong> returns the OID of the data type of the value that is passed to it. This can be helpful for troubleshooting or dynamically constructing SQL queries. The function is declared as returning <strong id="EN-US_TOPIC_0000001495991693__b113293975394254">regtype</strong>, which is an OID alias type (see <a href="dws_06_0022.html">Object Identifier Types</a>). This means that it is the same as an OID for comparison purposes but displays as a type name.</p>
<p id="EN-US_TOPIC_0000001495991693__p17418541408">Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen1341804124017"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">pg_typeof</span><span class="p">(</span><span class="mi">33</span><span class="p">);</span>
<span class="w"> </span><span class="n">pg_typeof</span><span class="w"> </span>
<span class="c1">-----------</span>
<span class="w"> </span><span class="nb">integer</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">typlen</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_type</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">oid</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pg_typeof</span><span class="p">(</span><span class="mi">33</span><span class="p">);</span>
<span class="w"> </span><span class="n">typlen</span><span class="w"> </span>
<span class="c1">--------</span>
<span class="w"> </span><span class="mi">4</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section055817589396"><h4 class="sectiontitle">collation for (any)</h4><p id="EN-US_TOPIC_0000001495991693__p855835823911">Description: Gets the collation of the parameter.</p>
<p id="EN-US_TOPIC_0000001495991693__p1755812586398">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p105581585391">Note:</p>
<p id="EN-US_TOPIC_0000001495991693__p20558558103912">The expression <strong id="EN-US_TOPIC_0000001495991693__b158042530794254">collation for</strong> returns the collation of the value that is passed to it. Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen10558658153919"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="k">collation</span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">description</span><span class="p">)</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_description</span><span class="w"> </span><span class="k">LIMIT</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
<span class="w"> </span><span class="n">pg_collation_for</span><span class="w"> </span>
<span class="c1">------------------</span>
<span class="w"> </span><span class="ss">&quot;default&quot;</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001495991693__p1055845812399">The value might be quoted and schema-qualified. If no collation is derived for the argument expression, then a null value is returned. If the parameter is not of a collectable data type, then an error is thrown.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section8367145518347"><h4 class="sectiontitle">getdistributekey(table_name)</h4><p id="EN-US_TOPIC_0000001495991693__p123670558343">Description: Gets a distribution column for a hash table.</p>
<p id="EN-US_TOPIC_0000001495991693__p5367155573415">Return type: text</p>
<p id="EN-US_TOPIC_0000001495991693__p036716557341">Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen136718556348"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">getdistributekey</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
<span class="w"> </span><span class="n">getdistributekey</span><span class="w"> </span>
<span class="c1">------------------</span>
<span class="w"> </span><span class="n">i_item_sk</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section3716258736"><h4 class="sectiontitle">table_skewness(text)</h4><p id="EN-US_TOPIC_0000001495991693__p97468391816">Description: Queries the percentage of table data among all nodes.</p>
<p id="EN-US_TOPIC_0000001495991693__p374617395117">Parameter: Indicates that the type of the name of the to-be-queried table is text.</p>
<p id="EN-US_TOPIC_0000001495991693__p1574623918116">Return type: record</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1965135118419"><h4 class="sectiontitle">table_skewness(table_name text, column_name text[, row_num text])</h4><p id="EN-US_TOPIC_0000001495991693__p774613919118">Description: Queries the proportion of column data distributed on each node based on the hash distribution rule. The results are sorted based on the data volumes of the nodes.</p>
<p id="EN-US_TOPIC_0000001495991693__p57467393119">Parameters: <strong id="EN-US_TOPIC_0000001495991693__b629725648112745">table_name</strong> indicates a table name, <strong id="EN-US_TOPIC_0000001495991693__b416120653112745">column_name</strong> indicates a column name, and <strong id="EN-US_TOPIC_0000001495991693__b2094942027112745">row_num</strong> indicates that all data in the current column is returned. The default value is <strong id="EN-US_TOPIC_0000001495991693__b828234217112745">0</strong>. A value other than <strong id="EN-US_TOPIC_0000001495991693__b1264464362112745">0</strong> indicates the number of data records whose statistics are sampled. (Records are randomly sampled.)</p>
<p id="EN-US_TOPIC_0000001495991693__p2747039715">Return type: record</p>
<p id="EN-US_TOPIC_0000001495991693__p19747203910115">Example:</p>
<p id="EN-US_TOPIC_0000001495991693__p147473391714">Distribute data by hash based on the column <strong id="EN-US_TOPIC_0000001495991693__b1893886637112745">a</strong> in the <strong id="EN-US_TOPIC_0000001495991693__b905137235112745">tx</strong> table. Seven records are distributed on DN 1, two records on DN 2, and one record on DN 0.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen137471039618"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">table_skewness</span><span class="p">(</span><span class="s1">'tx'</span><span class="p">,</span><span class="s1">'a'</span><span class="p">);</span>
<span class="w"> </span><span class="n">seqnum</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">num</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ratio</span>
<span class="c1">--------+-----+----------</span>
<span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">7</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">70</span><span class="p">.</span><span class="mi">000</span><span class="o">%</span>
<span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">20</span><span class="p">.</span><span class="mi">000</span><span class="o">%</span>
<span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">10</span><span class="p">.</span><span class="mi">000</span><span class="o">%</span>
<span class="p">(</span><span class="mi">3</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section287481117518"><h4 class="sectiontitle">table_data_skewness(data_row record, locatorType "char")</h4><p id="EN-US_TOPIC_0000001495991693__p07501939918">Description: Calculates the bucket distribution index for the records concatenated using the columns in a specified table.</p>
<p id="EN-US_TOPIC_0000001495991693__p137504391119">Parameters: <strong id="EN-US_TOPIC_0000001495991693__b1836126773112745">data_row</strong> indicates the record concatenated using columns in the specified table. <strong id="EN-US_TOPIC_0000001495991693__b830779059112745">locatorType</strong> indicates the distribution rule. You are advised to set <strong id="EN-US_TOPIC_0000001495991693__b154015614112745">locatorType</strong> to <strong id="EN-US_TOPIC_0000001495991693__b1036246619112745">H</strong>, indicating hash distribution.</p>
<p id="EN-US_TOPIC_0000001495991693__p27500392115">Return type: smallint</p>
<p id="EN-US_TOPIC_0000001495991693__p167501539510">Example:</p>
<p id="EN-US_TOPIC_0000001495991693__p14750239416">Calculates the bucket distribution index based on the hash distribution rule for the records combined concatenated using the columns in the <strong id="EN-US_TOPIC_0000001495991693__b1796774977112745">tx</strong> table.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen575063915117"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">table_data_skewness</span><span class="p">(</span><span class="k">row</span><span class="p">(</span><span class="n">a</span><span class="p">),</span><span class="w"> </span><span class="s1">'H'</span><span class="p">)</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">tx</span><span class="p">;</span>
<span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">table_data_skewness</span><span class="w"> </span>
<span class="c1">---+---------------------</span>
<span class="w"> </span><span class="mi">3</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">0</span>
<span class="w"> </span><span class="mi">6</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">2</span>
<span class="w"> </span><span class="mi">7</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">2</span>
<span class="w"> </span><span class="mi">4</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">1</span>
<span class="w"> </span><span class="mi">5</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">1</span>
<span class="p">(</span><span class="mi">5</span><span class="w"> </span><span class="k">rows</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section24392432518"><h4 class="sectiontitle">table_distribution(schemaname text, tablename text)</h4><p id="EN-US_TOPIC_0000001495991693__p375363917118">Description: Queries the storage space occupied by a specified table on each node.</p>
<p id="EN-US_TOPIC_0000001495991693__p97539391218">Parameter: Indicates that the types of the schema name and table name for the table to be queried are both text.</p>
<p id="EN-US_TOPIC_0000001495991693__p127531391110">Return type: record</p>
<div class="note" id="EN-US_TOPIC_0000001495991693__note67539391112"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001495991693__ul147546394114"><li id="EN-US_TOPIC_0000001495991693__li14754639413">To query for the storage distribution of a specified table by using this function, you must have the <strong id="EN-US_TOPIC_0000001495991693__b30645636112745">SELECT</strong> permission for the table.</li><li id="EN-US_TOPIC_0000001495991693__li1775415394111">The performance of <strong id="EN-US_TOPIC_0000001495991693__b1346670126112745">table_distribution</strong> is better than that of <strong id="EN-US_TOPIC_0000001495991693__b1362459529112745">table_skewness</strong>. Especially in a large cluster with a large amount of data, <strong id="EN-US_TOPIC_0000001495991693__b1211545890112745">table_distribution</strong> is recommended.</li><li id="EN-US_TOPIC_0000001495991693__li11755143919114">When you use <strong id="EN-US_TOPIC_0000001495991693__b1040708202112745">table_distribution</strong> and want to view the space usage, you can use <strong id="EN-US_TOPIC_0000001495991693__b1652799069112745">dnsize</strong> or <strong id="EN-US_TOPIC_0000001495991693__b1590494498112745">(sum(dnsize) over ())</strong> to view the percentage.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section113289171561"><h4 class="sectiontitle">table_distribution(regclass)</h4><p id="EN-US_TOPIC_0000001495991693__p4755153917112">Description: Queries the storage space occupied by a specified table on each node.</p>
<p id="EN-US_TOPIC_0000001495991693__p47561391411">Parameter: Indicates the name or OID of the table to be queried. The table name can be defined by the schema name. Parameter type: regclass</p>
<p id="EN-US_TOPIC_0000001495991693__p177561639115">Return type: record</p>
<div class="note" id="EN-US_TOPIC_0000001495991693__note5756739713"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001495991693__ul97566395117"><li id="EN-US_TOPIC_0000001495991693__li7757339210">To query for the storage distribution of a specified table by using this function, you must have the <strong id="EN-US_TOPIC_0000001495991693__b1623958892112745">SELECT</strong> permission for the table.</li><li id="EN-US_TOPIC_0000001495991693__li17757173917112">The performance of <strong id="EN-US_TOPIC_0000001495991693__b713613718112745">table_distribution</strong> is better than that of <strong id="EN-US_TOPIC_0000001495991693__b588234929112745">table_skewness</strong>. Especially in a large cluster with a large amount of data, <strong id="EN-US_TOPIC_0000001495991693__b123022121112745">table_distribution</strong> is recommended.</li><li id="EN-US_TOPIC_0000001495991693__li17757103911117">When you use <strong id="EN-US_TOPIC_0000001495991693__b130470369112745">table_distribution</strong> and want to view the space usage, you can use <strong id="EN-US_TOPIC_0000001495991693__b1908857064112745">dnsize</strong> or <strong id="EN-US_TOPIC_0000001495991693__b52784697112745">(sum(dnsize) over ())</strong> to view the percentage.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1327283314614"><h4 class="sectiontitle">table_distribution()</h4><p id="EN-US_TOPIC_0000001495991693__p13758739214">Description: Queries the storage distribution of all tables in the current database.</p>
<p id="EN-US_TOPIC_0000001495991693__p975873916111">Return type: record</p>
<div class="note" id="EN-US_TOPIC_0000001495991693__note137582391613"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001495991693__ul1175933915117"><li id="EN-US_TOPIC_0000001495991693__li475919398116">This function involves the query for information about all tables in the database. To execute this function, you must have the administrator rights or rights of the preset role <strong id="EN-US_TOPIC_0000001495991693__b1882152769112745">gs_role_read_all_stats</strong>.</li></ul>
<p id="EN-US_TOPIC_0000001495991693__p194413264385">Based on the table_distribution() function, <span id="EN-US_TOPIC_0000001495991693__text769433086">GaussDB(DWS)</span> provides the PGXC_GET_TABLE_SKEWNESS view as an alternative way to query for data skew. You are advised to use this view when the number of tables in the database is less than 10000.</p>
</div></div>
<p id="EN-US_TOPIC_0000001495991693__p1086983613817">Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen111738210402"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span>
<span class="normal">24</span>
<span class="normal">25</span>
<span class="normal">26</span>
<span class="normal">27</span>
<span class="normal">28</span>
<span class="normal">29</span>
<span class="normal">30</span>
<span class="normal">31</span>
<span class="normal">32</span>
<span class="normal">33</span>
<span class="normal">34</span>
<span class="normal">35</span>
<span class="normal">36</span>
<span class="normal">37</span>
<span class="normal">38</span>
<span class="normal">39</span>
<span class="normal">40</span>
<span class="normal">41</span>
<span class="normal">42</span>
<span class="normal">43</span>
<span class="normal">44</span>
<span class="normal">45</span>
<span class="normal">46</span>
<span class="normal">47</span>
<span class="normal">48</span>
<span class="normal">49</span>
<span class="normal">50</span>
<span class="normal">51</span>
<span class="normal">52</span>
<span class="normal">53</span>
<span class="normal">54</span>
<span class="normal">55</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">table_distribution</span><span class="p">();</span>
<span class="w"> </span><span class="n">schemaname</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">tablename</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">nodename</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dnsize</span>
<span class="c1">--------------------+-------------------------+--------------+--------</span>
<span class="w"> </span><span class="n">scheduler</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pg_task</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_group</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_item</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">sea</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_group</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="n">sea</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_item</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">customer_t1</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_session_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_operator_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_ec_operator_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pgxc_copy_error_log</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_features</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">98304</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_implementation_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_languages</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_packages</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_parts</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_sizing</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_sizing_profiles</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6005_6006</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">scheduler</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pg_task</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_group</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_item</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="n">sea</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_group</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">sea</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_item</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">customer_t1</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_session_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_operator_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_ec_operator_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pgxc_copy_error_log</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_features</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">98304</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_implementation_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_languages</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_packages</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_parts</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_sizing</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_sizing_profiles</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6003_6004</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">scheduler</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pg_task</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_group</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_item</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">sea</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_group</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">sea</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ocr_item</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">customer_t1</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16384</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_session_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_operator_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">dbms_om</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_ec_operator_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pgxc_copy_error_log</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_features</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">98304</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_implementation_info</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_languages</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_packages</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_parts</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_sizing</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">49152</span>
<span class="w"> </span><span class="n">information_schema</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">sql_sizing_profiles</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dn_6001_6002</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">8192</span>
<span class="p">(</span><span class="mi">51</span><span class="w"> </span><span class="k">rows</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section45812462069"><h4 class="sectiontitle">gs_table_distribution(schemaname text, tablename text)</h4><p id="EN-US_TOPIC_0000001495991693__p1076033912113">Description: Queries the storage space occupied by a specified table on each node.</p>
<p id="EN-US_TOPIC_0000001495991693__p1476012391116">Return type: record</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001495991693__table9760103911115" frame="border" border="1" rules="all"><caption><b>Table 1 </b>gs_table_distribution(schemaname text, tablename text)</caption><thead align="left"><tr id="EN-US_TOPIC_0000001495991693__row750517162511"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.29.4.2.4.1.1"><p id="EN-US_TOPIC_0000001495991693__p2763183917120">Column</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.29.4.2.4.1.2"><p id="EN-US_TOPIC_0000001495991693__p0764193917118">Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.29.4.2.4.1.3"><p id="EN-US_TOPIC_0000001495991693__p17765039212">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001495991693__row1505171615519"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p976515396111">schemaname</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p67665399120">name</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.29.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p187661039212">Specifies the schema name.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row1950511615513"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p376763911117">tablename</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p176773911112">name</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.29.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p57673399116">Table name</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row8505151617511"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p13768439013">relkind</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p15768939518">character</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.29.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p1876819391815">Type.</p>
<ul id="EN-US_TOPIC_0000001495991693__ul117688391719"><li id="EN-US_TOPIC_0000001495991693__li1276819399111"><strong id="EN-US_TOPIC_0000001495991693__b1956494124112745">i</strong>: index</li><li id="EN-US_TOPIC_0000001495991693__li16769339117"><strong id="EN-US_TOPIC_0000001495991693__b1249146258112745">r</strong>: table</li></ul>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row6506151635115"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p476919397119">nodename</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p976963920114">name</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.29.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p147701397112">Node name</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row28125273342"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p1577013391014">dnsize</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.29.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p577093913110">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.29.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p177713392119">Storage space of the table on the node, in bytes.</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="note" id="EN-US_TOPIC_0000001495991693__note47718391110"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001495991693__ul3772193910111"><li id="EN-US_TOPIC_0000001495991693__li137721639416">To query for the storage distribution of a specified table by using this function, you must have the <strong id="EN-US_TOPIC_0000001495991693__b581915434112745">SELECT</strong> permission for the table.</li><li id="EN-US_TOPIC_0000001495991693__li19772539519">This function is based on the physical file storage space records in the <strong id="EN-US_TOPIC_0000001495991693__b1858391437112745">PG_RELFILENODE_SIZE</strong> system catalog. Ensure that the GUC parameters <strong id="EN-US_TOPIC_0000001495991693__b1568625289112745">use_workload_manager</strong> and <strong id="EN-US_TOPIC_0000001495991693__b2131528026112745">enable_perm_space</strong> are enabled.</li><li id="EN-US_TOPIC_0000001495991693__li12772173914112">The performance of the <strong id="EN-US_TOPIC_0000001495991693__b760779216112745">gs_table_distribution</strong> function is lower than that of the <strong id="EN-US_TOPIC_0000001495991693__b414493552112745">table_distribution</strong> function when a single table is queried. But when the entire database is queried, the performance of the <strong id="EN-US_TOPIC_0000001495991693__b731487252112745">gs_table_distribution</strong> function is much better. In a large cluster with a large amount of data, you are advised to use the <strong id="EN-US_TOPIC_0000001495991693__b2063655050112745">gs_table_distribution</strong> function to query all tables in the database.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section128801016379"><h4 class="sectiontitle">gs_table_distribution()</h4><p id="EN-US_TOPIC_0000001495991693__p5773133915112">Description: Quickly queries the storage distribution of all tables in the current database.</p>
<p id="EN-US_TOPIC_0000001495991693__p107733391616">Return type: record</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001495991693__table77731739815" frame="border" border="1" rules="all"><caption><b>Table 2 </b>gs_table_distribution()</caption><thead align="left"><tr id="EN-US_TOPIC_0000001495991693__row756011552385"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.30.4.2.4.1.1"><p id="EN-US_TOPIC_0000001495991693__p277611391111">Column</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.30.4.2.4.1.2"><p id="EN-US_TOPIC_0000001495991693__p20777239912">Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.30.4.2.4.1.3"><p id="EN-US_TOPIC_0000001495991693__p14777639717">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001495991693__row1356115583817"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p20777133912112">schemaname</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p14778163912114">name</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.30.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p677853917111">Schema name</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row35612055153817"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p1477993917118">tablename</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p977917391115">name</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.30.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p157791394111">Table name</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row156135513382"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p278017391918">relkind</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p978093913119">character</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.30.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p77801739914">Type of the table. <strong id="EN-US_TOPIC_0000001495991693__b214199982112745">i</strong>: index; <strong id="EN-US_TOPIC_0000001495991693__b150714108112745">r</strong>: table.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row1356105503814"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p678118398110">nodename</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p1378183911112">name</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.30.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p0781143913119">Node name</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row135611055193811"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p378219398112">dnsize</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.30.4.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p18782739718">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.30.4.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p11783193918116">Storage space of the table on the node, in bytes.</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="note" id="EN-US_TOPIC_0000001495991693__note27836392012"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001495991693__ul1578316391312"><li id="EN-US_TOPIC_0000001495991693__li147831139311">To query for the storage distribution of a specified table by using this function, you must have the <strong id="EN-US_TOPIC_0000001495991693__b54534207112745">SELECT</strong> permission for the table.</li><li id="EN-US_TOPIC_0000001495991693__li167846392110">This function is based on the physical file storage space records in the <strong id="EN-US_TOPIC_0000001495991693__b286457933112745">PG_RELFILENODE_SIZE</strong> system catalog. Ensure that the GUC parameters <strong id="EN-US_TOPIC_0000001495991693__b1926795663112745">use_workload_manager</strong> and <strong id="EN-US_TOPIC_0000001495991693__b2140477872112745">enable_perm_space</strong> are enabled.</li><li id="EN-US_TOPIC_0000001495991693__li18784123910113">The performance of the <strong id="EN-US_TOPIC_0000001495991693__b841007814112745">gs_table_distribution</strong> function is lower than that of the <strong id="EN-US_TOPIC_0000001495991693__b1989195552112745">table_distribution</strong> function when a single table is queried. But when the entire database is queried, the performance of the <strong id="EN-US_TOPIC_0000001495991693__b609298274112745">gs_table_distribution</strong> function is much better. In a large cluster with a large amount of data, you are advised to use the <strong id="EN-US_TOPIC_0000001495991693__b1122515592112745">gs_table_distribution</strong> function to query all tables in the database.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section1615854111710"><h4 class="sectiontitle">pgxc_get_stat_dirty_tables(int dirty_percent, int n_tuples)</h4><p id="EN-US_TOPIC_0000001495991693__p2078611392112">Description: Obtains information about insertion, update, and deletion operations on tables and the dirty page rate of tables. This function optimizes the performance of the <strong id="EN-US_TOPIC_0000001495991693__b846562460112745">PGXC_GET_STAT_ALL_TABLES</strong> view. It can quickly filter out tables whose dirty page rate is greater than <strong id="EN-US_TOPIC_0000001495991693__b1024490720112745">dirty_percent</strong> and number of dead tuples is greater than <strong id="EN-US_TOPIC_0000001495991693__b188451324112745">n_tuples</strong> on each DN, and return the filtering results to the CN for summary and output.</p>
<p id="EN-US_TOPIC_0000001495991693__p187860390115">Return type: SETOF record</p>
<p id="EN-US_TOPIC_0000001495991693__p17861539413">The following table describes return columns.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001495991693__table8787139617" frame="border" border="1" rules="all"><thead align="left"><tr id="EN-US_TOPIC_0000001495991693__r296db8ff4a4f4195b3fd7d935ac3436d"><th align="left" class="cellrowborder" valign="top" width="33.33%" id="mcps1.3.31.5.1.4.1.1"><p id="EN-US_TOPIC_0000001495991693__p279153913111">Column</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="17.919999999999998%" id="mcps1.3.31.5.1.4.1.2"><p id="EN-US_TOPIC_0000001495991693__p7791439616">Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="48.75%" id="mcps1.3.31.5.1.4.1.3"><p id="EN-US_TOPIC_0000001495991693__p47922391915">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001495991693__r4058f6bdc9254911b191aa0e08d7edb6"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p167929391319">relid</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p4792239818">oid</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p147930399110">Table OID</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__r9a69c15440fd4b3d86b38804ac7efffd"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p1279310392116">relname</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p177941439715">name</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p19794193913113">Table name</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row1596942488"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p137943391715">schemaname</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p127951339117">name</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p157955391115">Schema name of the table</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__r3b0439badf02493a9fc3a84029209848"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p107962390112">n_tup_ins</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p8797113914113">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p77973392120">Number of inserted tuples</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row204781949282"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p979810393119">n_tup_upd</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p679817392111">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p1279914391214">Number of updated tuples</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row4302327154218"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p67992391617">n_tup_del</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p380017398118">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p68002392114">Number of deleted tuples</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row174687374424"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p158007396115">n_live_tup</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p158015391217">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p198011339115">Number of live tuples</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row157104984219"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p1580218397114">n_dead_tup</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p68028391213">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p20802153920115">Number of dead tuples</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row14389195612816"><td class="cellrowborder" valign="top" width="33.33%" headers="mcps1.3.31.5.1.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p10803103920119">dirty_page_rate</p>
</td>
<td class="cellrowborder" valign="top" width="17.919999999999998%" headers="mcps1.3.31.5.1.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p16803163916116">numeric(5,2)</p>
</td>
<td class="cellrowborder" valign="top" width="48.75%" headers="mcps1.3.31.5.1.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p48049391110">Dirty page rate (%) of a table</p>
</td>
</tr>
</tbody>
</table>
</div>
<p id="EN-US_TOPIC_0000001495991693__p17804193920118">Example:</p>
<p id="EN-US_TOPIC_0000001495991693__p13804173913111">Query the tables whose dirty page rate is greater than 10% and number of dirty data rows is greater than 1000 in the database:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen380553914112"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pgxc_get_stat_dirty_tables</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="k">where</span><span class="w"> </span><span class="n">dirty_page_rate</span><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="mi">10</span><span class="w"> </span><span class="k">and</span><span class="w"> </span><span class="n">n_dead_tup</span><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="mi">1000</span><span class="p">;</span>
<span class="w"> </span><span class="n">relid</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">relname</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">schemaname</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">n_tup_ins</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">n_tup_upd</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">n_tup_del</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">n_live_tup</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">n_dead_tup</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dirty_page_rate</span>
<span class="c1">-------+-------------------------+------------+-----------+-----------+-----------+------------+------------+-----------------</span>
<span class="w"> </span><span class="mi">16782</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">bandwidth_history_table</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">scheduler</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">356355</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">202068</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">154287</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">29031</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">15</span><span class="p">.</span><span class="mi">84</span>
<span class="w"> </span><span class="mi">12050</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">gs_wlm_instance_history</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">pg_catalog</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">406464</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">234835</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">171647</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">27721</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">13</span><span class="p">.</span><span class="mi">90</span>
<span class="p">(</span><span class="mi">2</span><span class="w"> </span><span class="k">rows</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section13431631189"><h4 class="sectiontitle">pgxc_get_stat_dirty_tables(int dirty_percent, int n_tuples, text schema)</h4><p id="EN-US_TOPIC_0000001495991693__p980716395113">Description: Obtains information about insertion, update, and deletion operations on tables and the dirty page rate of tables. This function optimizes the performance of the <strong id="EN-US_TOPIC_0000001495991693__b1894735706112745">PGXC_GET_STAT_ALL_TABLES</strong> view. It can quickly filter out tables whose dirty page rate is greater than <strong id="EN-US_TOPIC_0000001495991693__b1580485490112745">dirty_percent</strong> and number of dead tuples is greater than <strong id="EN-US_TOPIC_0000001495991693__b842651218112745">n_tuples</strong> on each DN, and return the filtering results to the CN for summary and output. <strong id="EN-US_TOPIC_0000001495991693__b2141185674112745">text schema</strong> indicates tables whose schema name is <strong id="EN-US_TOPIC_0000001495991693__b2103137056112745">schema</strong>.</p>
<p id="EN-US_TOPIC_0000001495991693__p11807639215">Return type: SETOF record</p>
<p id="EN-US_TOPIC_0000001495991693__p16807133917116">The return columns of the function are the same as those of the <strong id="EN-US_TOPIC_0000001495991693__b1108623307112745">pgxc_get_stat_dirty_tables(int dirty_percent, int n_tuples)</strong> function.</p>
<p id="EN-US_TOPIC_0000001495991693__p198072392114">Example:</p>
<p id="EN-US_TOPIC_0000001495991693__p1807193912117">Query the dirty page rate of the <strong id="EN-US_TOPIC_0000001495991693__b2007074670112745">pg_catalog.pg_class </strong>system catalog.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen780710391119"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">relname</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">table_name</span><span class="p">,</span><span class="n">dirty_page_rate</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pgxc_get_stat_dirty_tables</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="s1">'pg_catalog'</span><span class="p">)</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">relname</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'pg_class'</span><span class="p">;</span>
<span class="w"> </span><span class="k">table_name</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">dirty_page_rate</span>
<span class="c1">------------+-----------------</span>
<span class="w"> </span><span class="n">pg_class</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">16</span><span class="p">.</span><span class="mi">46</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section147261373135"><h4 class="sectiontitle">gs_switch_relfilenode()</h4><p id="EN-US_TOPIC_0000001495991693__p168185391418">Description: Exchanges meta information of two tables or partitions. (This is only used for the redistribution tool. An error message is displayed when the function is directly used by users).</p>
<p id="EN-US_TOPIC_0000001495991693__p681918398110">Return type: integer</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001495991693__section153827559134"><h4 class="sectiontitle">copy_error_log_create()</h4><p id="EN-US_TOPIC_0000001495991693__p1181914391119">Description: Creates the error table (<strong id="EN-US_TOPIC_0000001495991693__b1099800520112745">public.pgxc_copy_error_log</strong>) required for creating the <strong id="EN-US_TOPIC_0000001495991693__b943310408112745">COPY FROM</strong> error tolerance mechanism.</p>
<p id="EN-US_TOPIC_0000001495991693__p581915391113">Return type: <span id="EN-US_TOPIC_0000001495991693__text9105556192216">boolean</span></p>
<div class="note" id="EN-US_TOPIC_0000001495991693__note178191439217"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001495991693__ul98208396113"><li id="EN-US_TOPIC_0000001495991693__li168201739411">This function attempts to create the <strong id="EN-US_TOPIC_0000001495991693__b1640825864112745">public.pgxc_copy_error_log</strong> table. For details about the table, see <a href="#EN-US_TOPIC_0000001495991693__table2822639715">Table 3</a>.</li><li id="EN-US_TOPIC_0000001495991693__li148202391716">Create the B-tree index on the <strong id="EN-US_TOPIC_0000001495991693__b2049053008112745">relname</strong> column and execute <strong id="EN-US_TOPIC_0000001495991693__b1004758322112745">REVOKE ALL on public.pgxc_copy_error_log FROM public</strong> to manage permissions for the error table (the permissions are the same as those of the <strong id="EN-US_TOPIC_0000001495991693__b1786882794112745">COPY</strong> statement).</li><li id="EN-US_TOPIC_0000001495991693__li15821183913112"><strong id="EN-US_TOPIC_0000001495991693__b27631266112745">public.pgxc_copy_error_log</strong> is a row-store table. Therefore, this function can be executed and <strong id="EN-US_TOPIC_0000001495991693__b212495643112745">COPY FROM</strong> error tolerance is available only when row-store tables can be created in the cluster. After the GUC parameter <strong id="EN-US_TOPIC_0000001495991693__b1947531385112745">enable_hadoop_env</strong> is enabled, row-based tables cannot be created in the cluster. The default value is <strong id="EN-US_TOPIC_0000001495991693__b1885819636112745">off</strong>.</li><li id="EN-US_TOPIC_0000001495991693__li2821339619">Same as the error table and the <strong id="EN-US_TOPIC_0000001495991693__b2012463815112745">COPY</strong> statement, the function requires <strong id="EN-US_TOPIC_0000001495991693__b1882266659112745">sysadmin</strong> or higher permissions.</li><li id="EN-US_TOPIC_0000001495991693__li14821173915112">If the <strong id="EN-US_TOPIC_0000001495991693__b1650966477112745">public.pgxc_copy_error_log</strong> table or the <strong id="EN-US_TOPIC_0000001495991693__b653131688112745">copy_error_log_relname_idx</strong> index already exists before the function creates it, the function will report an error and roll back.</li></ul>
</div></div>
<div class="tablenoborder"><a name="EN-US_TOPIC_0000001495991693__table2822639715"></a><a name="table2822639715"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001495991693__table2822639715" frame="border" border="1" rules="all"><caption><b>Table 3 </b>Error table public.pgxc_copy_error_log</caption><thead align="left"><tr id="EN-US_TOPIC_0000001495991693__row48415282214"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.34.5.2.4.1.1"><p id="EN-US_TOPIC_0000001495991693__p78265393112">Column</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.34.5.2.4.1.2"><p id="EN-US_TOPIC_0000001495991693__p19827239616">Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.34.5.2.4.1.3"><p id="EN-US_TOPIC_0000001495991693__p2828439314">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001495991693__row65469159815"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p188290393111">relname</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p582916391111">varchar</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.34.5.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p98300395110">Name of the table, which is in the form of <em id="EN-US_TOPIC_0000001495991693__i1330787430112745">Schema name</em><strong id="EN-US_TOPIC_0000001495991693__b713467850112745">.</strong><em id="EN-US_TOPIC_0000001495991693__i153019784112745">Table name</em></p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row984112817210"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p78305398119">begintime</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p383013919116">timestamp with time zone</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.34.5.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p98314394116">Time when a data format error was reported</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row148502818216"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p78311639717">filename</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p1832339311">character varying</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.34.5.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p198326398110">Name of the source data file where a data format error occurs</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row1418810441476"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p2832163911119">rownum</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p1383320391918">bigint</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.34.5.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p1383320399119">Number of the row where a data format error occurs in a source data file</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row181905441873"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p12834739619">rawrecord</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p683412394114">text</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.34.5.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p19834639718">Raw record of a data format error in the source data file. To prevent a field from being too long, the length of the field cannot exceed 1024 bytes.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001495991693__row1487854919720"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.1 "><p id="EN-US_TOPIC_0000001495991693__p783553911118">detail</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.34.5.2.4.1.2 "><p id="EN-US_TOPIC_0000001495991693__p1835183918111">text</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.34.5.2.4.1.3 "><p id="EN-US_TOPIC_0000001495991693__p483633915113">Error details</p>
</td>
</tr>
</tbody>
</table>
</div>
<p id="EN-US_TOPIC_0000001495991693__p16601192592913">Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001495991693__screen121812414297"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">copy_error_log_create</span><span class="p">();</span>
<span class="w"> </span><span class="n">copy_error_log_create</span>
<span class="c1">-----------------------</span>
<span class="w"> </span><span class="n">t</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_06_0051.html">System Information Functions</a></div>
</div>
</div>
View Git Blame Copy Permalink