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Lu, Huayi 27019c2991 DWS TOOL 830.201 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
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 07:35:25 +00:00

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<a name="EN-US_TOPIC_0000001819336113"></a><a name="EN-US_TOPIC_0000001819336113"></a>
<h1 class="topictitle1">VOLATILE</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_p840815374219">The table-specific keyword <strong id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_b64755475131554">VOLATILE</strong> is provided in the input file, but the keyword is not supported by GaussDB(DWS). The tool replaces it with the <strong id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_b27607761631554">LOCAL TEMPORARY </strong>keyword during the migration process. Volatile tables are migrated as local temporary or unlogged based on the config input.</p>
<p id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_p175110387221"><strong id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_b16572774631554">Input: CREATE VOLATILE TABLE</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_screen2677101582815"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">VOLATILE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">T1</span><span class="w"> </span><span class="p">(</span><span class="n">c1</span><span class="w"> </span><span class="nb">int</span><span class="w"> </span><span class="p">,</span><span class="n">c2</span><span class="w"> </span><span class="nb">int</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_p14677131572812"><strong id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_b51202644712">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_screen56781615172811"><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">CREATE</span>
<span class="w"> </span><span class="k">LOCAL</span><span class="w"> </span><span class="k">TEMPORARY</span><span class="w"> </span><span class="k">TABLE</span>
<span class="w"> </span><span class="n">T1</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="n">c1</span><span class="w"> </span><span class="nb">INTEGER</span>
<span class="w"> </span><span class="p">,</span><span class="n">c2</span><span class="w"> </span><span class="nb">INTEGER</span>
<span class="w"> </span><span class="p">)</span>
<span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_p1288911304312"><strong id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_b140709794431554">Input: CREATE VOLATILE TABLE AS WITH DATA</strong> (session_mode=Teradata)</p>
<p id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_p15871335141415">If the source table has a PRIMARY KEY or a UNIQUE CONSTRAINT, then it will not contain any duplicate records. In this case, the MINUS operator is not required or added to remove duplicate records.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_screen5893230193114"><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">CREATE</span><span class="w"> </span><span class="k">VOLATILE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">tabV1</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="n">C1</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="mi">99</span>
<span class="w"> </span><span class="p">,</span><span class="n">C2</span><span class="w"> </span><span class="nb">INTEGER</span>
<span class="w"> </span><span class="p">,</span><span class="n">C3</span><span class="w"> </span><span class="nb">INTEGER</span>
<span class="w"> </span><span class="p">,</span><span class="n">C4</span><span class="w"> </span><span class="nb">NUMERIC</span><span class="w"> </span><span class="p">(</span><span class="mi">20</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="p">(</span><span class="nb">BIGINT</span><span class="p">)</span>
<span class="w"> </span><span class="p">,</span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="n">XX1</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">C1</span><span class="p">,</span><span class="w"> </span><span class="n">C2</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="p">(</span><span class="n">C1</span><span class="p">,</span><span class="w"> </span><span class="n">C3</span><span class="w"> </span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">tabV2</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">tabV1</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="k">DATA</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="p">(</span><span class="n">C1</span><span class="p">)</span>
<span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">COMMIT</span><span class="w"> </span><span class="k">PRESERVE</span><span class="w"> </span><span class="k">ROWS</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_p1389633015318"><strong id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_b316514194719">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001819336113__en-us_topic_0000001706223989_en-us_topic_0000001384071360_screen589833083117"><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></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">LOCAL</span><span class="w"> </span><span class="k">TEMPORARY</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">tabV1</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="n">C1</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="mi">99</span>
<span class="w"> </span><span class="p">,</span><span class="n">C2</span><span class="w"> </span><span class="nb">INTEGER</span>
<span class="w"> </span><span class="p">,</span><span class="n">C3</span><span class="w"> </span><span class="nb">INTEGER</span>
<span class="w"> </span><span class="p">,</span><span class="n">C4</span><span class="w"> </span><span class="nb">NUMERIC</span><span class="w"> </span><span class="p">(</span><span class="mi">20</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">CAST</span><span class="p">(</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="nb">BIGINT</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="p">,</span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="n">XX1</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">C1</span><span class="p">,</span><span class="w"> </span><span class="n">C2</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="p">)</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="w"> </span><span class="p">(</span><span class="n">C1</span><span class="p">);</span>
<span class="k">BEGIN</span><span class="w"> </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">tabV2</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">LIKE</span><span class="w"> </span><span class="n">tabV1</span><span class="w"> </span><span class="k">INCLUDING</span><span class="w"> </span><span class="k">ALL</span><span class="w"> </span><span class="k">EXCLUDING</span><span class="w"> </span><span class="n">PARTITION</span><span class="w"> </span><span class="k">EXCLUDING</span><span class="w"> </span><span class="n">RELOPTIONS</span><span class="w"> </span><span class="k">EXCLUDING</span><span class="w"> </span><span class="n">DISTRIBUTION</span>
<span class="w"> </span><span class="p">)</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="w"> </span><span class="p">(</span><span class="n">C1</span><span class="p">);</span>
<span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">tabV2</span><span class="w"> </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">tabV1</span><span class="p">;</span>
<span class="k">END</span>
<span class="p">;</span>
<span class="o">/</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0061.html">Migrating Tables</a></div>
</div>
</div>
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