104 lines
6.5 KiB
HTML
104 lines
6.5 KiB
HTML
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<!DOCTYPE html
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<meta name="abstract" content="Use this table to learn what information each tool can yield about your query, when in the process a specific tool can analyze your query, and the tasks that each tool can perform to improve your query." />
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<meta name="description" content="Use this table to learn what information each tool can yield about your query, when in the process a specific tool can analyze your query, and the tasks that each tool can perform to improve your query." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Query optimization tools: Comparison table</title>
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</head>
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<body id="compare"><a name="compare"><!-- --></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">Query optimization tools: Comparison table</h1>
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<div><p>Use this table to learn what information each tool can yield about
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your query, when in the process a specific tool can analyze your query, and
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the tasks that each tool can perform to improve your query.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><thead align="left"><tr><th align="left" valign="top" id="d0e21"><span class="cmdname">PRTSQLINF</span></th>
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<th align="left" valign="top" id="d0e24"><span class="cmdname">STRDBG</span> or <span class="cmdname">CHGQRYA</span></th>
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<th align="left" valign="top" id="d0e30">File-based monitor (STRDBMON)</th>
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<th align="left" valign="top" id="d0e32">Memory-Based Monitor</th>
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<th align="left" valign="top" id="d0e34">Visual Explain</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" headers="d0e21 ">Available without running query (after access
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plan has been created)</td>
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<td align="left" valign="top" headers="d0e24 ">Only available when the query is run</td>
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<td align="left" valign="top" headers="d0e30 ">Only available when the query is run</td>
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<td align="left" valign="top" headers="d0e32 ">Only available when the query is run</td>
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<td align="left" valign="top" headers="d0e34 ">Only available when the query is explained</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e21 ">Displayed for all queries in SQL program,
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whether executed or not</td>
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<td align="left" valign="top" headers="d0e24 ">Displayed only for those queries which are
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executed</td>
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<td align="left" valign="top" headers="d0e30 ">Displayed only for those queries which are
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executed</td>
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<td align="left" valign="top" headers="d0e32 ">Displayed only for those queries which are
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executed</td>
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<td valign="top" headers="d0e34 ">Displayed only for those queries that are explained</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e21 ">Information about host variable implementation</td>
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<td align="left" valign="top" headers="d0e24 ">Limited information about the implementation
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of host variables</td>
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<td align="left" valign="top" headers="d0e30 ">All information about host variables, implementation,
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and values</td>
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<td align="left" valign="top" headers="d0e32 ">All information about host variables, implementation,
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and values</td>
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<td valign="top" headers="d0e34 ">All information about host variables, implementation, and values</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e21 ">Available only to SQL users with programs,
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packages, or service programs</td>
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<td align="left" valign="top" headers="d0e24 ">Available to all query users (<span class="cmdname">OPNQRYF</span>,
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SQL, QUERY/400)</td>
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<td align="left" valign="top" headers="d0e30 ">Available to all query users (<span class="cmdname">OPNQRYF</span>,
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SQL, QUERY/400) </td>
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<td align="left" valign="top" headers="d0e32 ">Available only to SQL interfaces</td>
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<td valign="top" headers="d0e34 ">Available through iSeries™ Navigator Database and API interface</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e21 ">Messages are printed to spool file</td>
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<td align="left" valign="top" headers="d0e24 ">Messages is displayed in job log</td>
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<td align="left" valign="top" headers="d0e30 ">Performance rows are written to database
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table</td>
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<td align="left" valign="top" headers="d0e32 ">Performance information is collected in memory
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and then written to database table</td>
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<td valign="top" headers="d0e34 ">Information is displayed visually through iSeries Navigator</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e21 ">Easier to tie messages to query with subqueries
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or unions</td>
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<td align="left" valign="top" headers="d0e24 ">Difficult to tie messages to query with subqueries
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or unions</td>
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<td align="left" valign="top" headers="d0e30 ">Uniquely identifies every query, subquery
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and materialized view</td>
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<td align="left" valign="top" headers="d0e32 ">Repeated query requests are summarized</td>
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<td valign="top" headers="d0e34 ">Easy to view implementation of the query and associated information</td>
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</tr>
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</tbody>
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</table>
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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>
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</body>
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</html>
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