forked from docs/doc-exports
Lu, Huayi
e6fa411af0
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>
24 lines
3.1 KiB
HTML
24 lines
3.1 KiB
HTML
<a name="EN-US_TOPIC_0000001188270496"></a><a name="EN-US_TOPIC_0000001188270496"></a>
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<h1 class="topictitle1">System Operation</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001188270496__en-us_topic_0059778982_p93511448513"><span id="EN-US_TOPIC_0000001188270496__text1761580221">GaussDB(DWS)</span> runs SQL statements to perform different system operations, such as setting variables, displaying the execution plan, and collecting garbage data.</p>
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<div class="section" id="EN-US_TOPIC_0000001188270496__sc740521470cf4158875c46fb0d761fd6"><h4 class="sectiontitle">Setting Variables</h4><p id="EN-US_TOPIC_0000001188270496__a2c60d9823c4f46a09c58c8695cdf4ca6">For details about how to set various parameters for a session or transaction, see <a href="dws_06_0220.html">SET</a>.</p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001188270496__s5d3edc3919f842b28ea5f7ec940934c2"><h4 class="sectiontitle">Displaying the Execution Plan</h4><p id="EN-US_TOPIC_0000001188270496__a29c56febd0434b788aab18c372a9cdbc">For details about how to display the execution plan that <span id="EN-US_TOPIC_0000001188270496__text396007768">GaussDB(DWS)</span> makes for SQL statements, see <a href="dws_06_0232.html">EXPLAIN</a>.</p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001188270496__s1076fb7dc8064ba0babd27fab6320a57"><h4 class="sectiontitle">Specifying a Checkpoint in Transaction Logs</h4><p id="EN-US_TOPIC_0000001188270496__a1a7ed1acada44e24af708ac8b08f5d1e">By default, WALs periodically specify checkpoints in a transaction log. <strong id="EN-US_TOPIC_0000001188270496__b4167443115054">CHECKPOINT</strong> forces an immediate checkpoint when the related command is issued, without waiting for a regular checkpoint scheduled by the system. For details, see <a href="dws_06_0258.html">CHECKPOINT</a>.</p>
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<div class="section" id="EN-US_TOPIC_0000001188270496__s4455102cf5734183b654143a0c8f5857"><h4 class="sectiontitle">Collecting Unnecessary Data</h4><p id="EN-US_TOPIC_0000001188270496__a9f3dce6533294eb0ae1589d6ad6998fb">For details about how to collect garbage data and analyze a database as required, For details, see <a href="dws_06_0226.html">VACUUM</a>.</p>
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<div class="section" id="EN-US_TOPIC_0000001188270496__sf0f43b969fd047faa63bc2945696ddc5"><h4 class="sectiontitle">Collecting statistics</h4><p id="EN-US_TOPIC_0000001188270496__a89d7a7f23ebc42ff9cd6efc600b471bc">For details about how to collect statistics on tables in databases, For details, see <a href="dws_06_0245.html">ANALYZE | ANALYSE</a>.</p>
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<div class="section" id="EN-US_TOPIC_0000001188270496__s8579954e6a11498e95d3618ff200364e"><h4 class="sectiontitle">Setting the Constraint Check Mode for the Current Transaction</h4><p id="EN-US_TOPIC_0000001188270496__a2e2d88da972b426fa996ac5a3fe262d1">For details about how to set the constraint check mode for the current transaction, For details, see <a href="dws_06_0221.html">SET CONSTRAINTS</a>.</p>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_2000.html">SQL Syntax Reference</a></div>
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