77 lines
5.3 KiB
HTML
77 lines
5.3 KiB
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<meta name="DC.Title" content="Gather information about embedded SQL statements with the PRTSQLINF command" />
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<meta name="abstract" content="The Print SQL Information (PRTSQLINF) command returns information about the embedded SQL statements in a program, SQL package (the object normally used to store the access plan for a remote query), or service program. This information is then stored in a spooled file." />
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<meta name="description" content="The Print SQL Information (PRTSQLINF) command returns information about the embedded SQL statements in a program, SQL package (the object normally used to store the access plan for a remote query), or service program. This information is then stored in a spooled file." />
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<title>Gather information about embedded SQL statements with the PRTSQLINF command</title>
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<body id="psi"><a name="psi"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Gather information about embedded SQL statements with the <span class="cmdname">PRTSQLINF</span> command</h1>
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<div><p>The <span class="cmdname">Print SQL Information (PRTSQLINF)</span> command
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returns information about the embedded SQL statements in a program, SQL package
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(the object normally used to store the access plan for a remote query), or
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service program. This information is then stored in a spooled file.</p>
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<div class="section"><p><span class="cmdname">PRTSQLINF</span> provides information about: </p>
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<ul><li>The SQL statements being executed</li>
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<li>The type of access plan used during execution. This includes information
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about how the query will be implemented, the indexes used, the join order,
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whether a sort is done, whether a database scan is sued, and whether an index
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is created.</li>
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<li>A list of the command parameters used to precompile the source member
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for the object.</li>
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<li>The CREATE PROCEDURE and CREATE FUNCTION statement text used to create
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external procedures or User Defined Functions.</li>
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</ul>
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<p>This output is similar to the information that you can get from debug
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messages. However, while query debug messages work at runtime, <span class="cmdname">PRTSQLINF</span> works
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retroactively. You can also see this information in the second level text
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of the query governor inquiry message CPA4259.</p>
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</div>
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<div class="section"><p>You can issue <span class="cmdname">PRTSQLINF</span> in a couple of ways.
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First, you can run the <span class="cmdname">PRTSQLINF</span> command against a saved
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access plan. This means you must execute or at least prepare the query (using
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SQL's PREPARE statement) before you use the command. It is best to execute
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the query because the index created as a result of PREPARE is relatively sparse
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and may well change after the first run. <span class="cmdname">PRTSQLINF</span>'s requirement
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of a saved access plan means the command cannot be used with <span class="cmdname">OPNQRYF</span>.</p>
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</div>
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<div class="section"><p>You can also run <span class="cmdname">PRTSQLINF</span> against functions,
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stored procedures, triggers, SQL packages, and programs from iSeries™ Navigator.
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This function is called Explain SQL. To view <span class="cmdname">PRTSQLINF</span> information,
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right-click an object and select <span class="uicontrol">Explain SQL</span>.</p>
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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="queryopt.htm" title="Query optimization is an iterative process. You can gather performance information about your queries and control the processing of your queries.">Optimizing query performance using query optimization tools</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>
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</div>
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</body>
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</html>
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