67 lines
3.6 KiB
HTML
67 lines
3.6 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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<meta name="DC.Title" content="SQL4002 - Reusable ODP sort used" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>SQL4002 - Reusable ODP sort used</title>
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</head>
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<body id="sql4002"><a name="sql4002"><!-- --></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">SQL4002 - Reusable ODP sort 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">SQL4002</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 ">Reusable ODP sort 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 ">Conditions exist in the query which cause a sort to be used. This allowed
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the open data path (ODP) to be reusable. One of the following reasons may
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be the cause for the sort: <ul><li>The query contains ordering columns (ORDER BY) from more than one table,
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or contains ordering columns from a secondary table of a join query that cannot
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be reordered.</li>
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<li>The grouping and ordering columns are not compatible.</li>
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<li>DISTINCT was specified for the query.</li>
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<li>UNION was specified for the query.</li>
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<li>The query had to be implemented using a sort. Key length of more than
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2000 bytes, more than 120 ordering columns, or an ordering column containing
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a reference to an external user-defined function was specified for ordering.</li>
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<li>The query optimizer chose to use a sort rather than an index to order
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the results of the query.</li>
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</ul>
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</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 ">A reusable ODP generally results in improved performance when compared
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to a non-reusable ODP.</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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