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4.3 KiB
HTML
58 lines
4.3 KiB
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Testing temporary storage usage with the query governor" />
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<meta name="abstract" content="The predictive storage governor specifies a temporary storage limit for database queries. You can use the query governor to test if a query uses any temporary object to run the query, such as a hash table, sort or temporary index." />
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<meta name="description" content="The predictive storage governor specifies a temporary storage limit for database queries. You can use the query governor to test if a query uses any temporary object to run the query, such as a hash table, sort or temporary index." />
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<meta name="DC.Relation" scheme="URI" content="../cl/prtsqlinf.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Testing temporary storage usage with the query governor</title>
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</head>
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<body id="rzajqstoragegov"><a name="rzajqstoragegov"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Testing temporary storage usage with the query governor</h1>
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<div><p>The predictive storage governor specifies a temporary storage limit
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for database queries. You can use the query governor to test if a query uses
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any temporary object to run the query, such as a hash table, sort or temporary
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index.</p>
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<div class="section"><p>To test for a temporary object's usage, do the following: </p>
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<ul><li>Set the query storage limit to zero ( QRYSTGLMT(0) ) using the <span class="cmdname">Change
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Query Attributes (CHGQRYA)</span> command or in the INI file. This forces
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an inquiry message from the governor anytime a temporary object will be used
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for the query, regardless of the temporary object's estimated size.</li>
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<li>Prompt for message help on the inquiry message and find the same information
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that you can find by running the <span class="cmdname">Print SQL Information (PRTSQLINF)</span> command.
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This allows you to see what temporary object(s) was involved. </li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="govrle.htm" title="The DB2 Universal Database for iSeries Predictive Query Governor can stop the initiation of a query if the estimated run time (elapsed execution time) or estimated temporary storage for the query is excessive. The governor acts before a query is run instead of while a query is run. The governor can be used in any interactive or batch job on the iSeries. It can be used with all DB2 Universal Database for iSeries query interfaces and is not limited to use with SQL queries.">Set resource limits with the Predictive Query Governor</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/prtsqlinf.htm">Print SQL Information (PRTSQLINF) command</a></div>
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<div><a href="../cl/chgqrya.htm">Change Query Attributes (CHGQRYA) command</a></div>
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</div>
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</div>
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<img src="./deltaend.gif" alt="End of change" /></body>
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</html>
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