63 lines
3.7 KiB
HTML
63 lines
3.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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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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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Title" content="SQL4024 - Parallel index preload access method used" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>SQL4024 - Parallel index preload access method used</title>
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</head>
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<body id="sql4024"><a name="sql4024"><!-- --></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">SQL4024 - Parallel index preload access method used</h1>
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<div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th colspan="2" align="center" valign="middle" id="d0e16">SQL4024</th>
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</tr>
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</thead>
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<tbody><tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e16 ">Message Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e16 ">Parallel index preload access method used</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e16 ">Cause Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e16 ">The query optimizer chose to use a parallel index preload access method
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to reduce the processing time required for this query. This means that the
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indexes used by this query will be loaded into active memory when the query
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is opened.</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e16 ">Recovery Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e16 ">Parallel index preload can improve the performance of queries. Even
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though the access plan was created to use parallel preload, the system will
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actually use parallel preload only if the following are true: <ul><li>The query attribute degree was specified with an option of *IO or *ANY
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for the application process.</li>
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<li>There is enough main storage to load all of the index objects used by
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this query into active memory. Normally, a minimum of 5 megabytes would be
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a minimum. Increasing the size of the shared pool may improve performance.</li>
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</ul>
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For more information about parallel index preload, refer to the <a href="rzajqdta.htm#rzajqdta">Data access on DB2 UDB for iSeries: data access paths and methods</a>.</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="prtsqlinfmsg.htm" title="The following are the messages returned from PRTSQLINF.">PRTSQLINF message reference</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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