91 lines
5.6 KiB
HTML
91 lines
5.6 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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<meta name="DC.Title" content="Query optimization performance information messages and open data paths" />
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<meta name="abstract" content="Several of the following SQL run-time messages refer to open data paths." />
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<meta name="description" content="Several of the following SQL run-time messages refer to open data paths." />
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<meta name="DC.subject" content="open data path, definition, definitions, data path, open, path, open data, open data path, information messages, performance, open data path messages, message, open data path information" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Query optimization performance information messages and open data paths</title>
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</head>
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<body id="pimesodp"><a name="pimesodp"><!-- --></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 performance information messages and open data paths</h1>
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<div><p>Several of the following SQL run-time messages refer to open data
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paths.</p>
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<p>An open data path (ODP) definition is an internal object that is created
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when a cursor is opened or when other SQL statements are run. It provides
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a direct link to the data so that I/O operations can occur. ODPs are used
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on OPEN, INSERT, UPDATE, DELETE, and SELECT INTO statements to perform their
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respective operations on the data.</p>
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<p>Even though SQL cursors are closed and SQL statements have already been
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run, the database manager in many cases will save the associated ODPs of the
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SQL operations to reuse them the next time the statement is run. So an SQL
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CLOSE statement may close the SQL cursor but leave the ODP available to be
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used again the next time the cursor is opened. This can significantly reduce
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the processing and response time in running SQL statements.</p>
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<p>The ability to reuse ODPs when SQL statements are run repeatedly is an
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important consideration in achieving faster performance.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="sql7910.htm">SQL7910 - All SQL cursors closed</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7911.htm">SQL7911 - ODP reused</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7912.htm">SQL7912 - ODP created</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7913.htm">SQL7913 - ODP deleted</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7914.htm">SQL7914 - ODP not deleted</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7915.htm">SQL7915 - Access plan for SQL statement has been built</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7916.htm">SQL7916 - Blocking used for query</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7917.htm">SQL7917 - Access plan not updated</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7918.htm">SQL7918 - Reusable ODP deleted</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7919.htm">SQL7919 - Data conversion required on FETCH or embedded SELECT</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="sql7939.htm">SQL7939 - Data conversion required on INSERT or UPDATE</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajqmsgref.htm" title="See the following for query optimizer message reference:">Query optimizer messages 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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