65 lines
4.3 KiB
HTML
65 lines
4.3 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="keywords" content="description, package, access plan and packages" />
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<title>Packages and access plans</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="packageap"></a>
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<h2 id="packageap"><a href="rbafzmst02.htm#ToC_38">Packages and access plans</a></h2><a id="idx106" name="idx106"></a><a id="idx107" name="idx107"></a>
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<p>A <span class="italic">package</span> is an object that contains control structures
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used to execute SQL statements.<sup class="fn"><a id="wq13" name="wq13" href="rbafzmstpackageap.htm#wq14">4</a></sup> Packages are produced during distributed program preparation. The control
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structures can be thought of as the bound or operational form of SQL statements.
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All control structures in a package are derived from the SQL statements embedded
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in a single source program.</p>
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<p>In this book, the term <span class="italic">access plan</span> is used in general
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for packages, procedures, functions, triggers, and programs or service programs
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that contain control structures used to execute SQL statements. For example,
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the description of the DROP statement says that dropping an object also invalidates
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any access plans that reference the object (see <a href="rbafzmstdropst.htm#dropst">DROP</a>). This
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means that any packages, procedures, functions, triggers, and programs or
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service programs containing control structures referencing the dropped object
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are invalidated.</p>
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<p>An invalidated <span class="italic">access plan</span> will be implicitly rebuilt
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the next time its associated SQL statement is executed. For example, if an
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index is dropped that is used in an <span class="italic">access plan</span> for
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a SELECT INTO statement, the next time that SELECT INTO statement is executed,
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the access plan will be rebuilt.</p>
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<p>A package can also be created by the QSQPRCED API. Packages created by
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the QSQPRCED API can only be used by the QSQPRCED API. They cannot be used
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at an application server through DRDA® protocols. For more information, see the <a href="../apis/file1.htm">i5/OS™ APIs</a> information in the <span class="bold">Programming</span> category
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of the iSeries Information Center.</p>
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<p>The QSQPRCED API is used by IBM eServer iSeries Access for Windows to create packages for caching
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SQL statements executed via ODBC, JDBC, SQLJ, OLD DB, and .NET interfaces.</p>
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<hr /><div class="fnnum"><a id="wq14" name="wq14" href="rbafzmstpackageap.htm#wq13">4</a>.</div>
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<div class="fntext">For non-distributed SQL programs, non-distributed
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service programs, SQL functions, and SQL procedures, the control structures
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used to execute SQL statements are stored in the associated space of the object.</div>
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<br />
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<hr /><br />
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[ <a href="#Top_Of_Page">Top of Page</a> | <a href="rbafzmstali.htm">Previous Page</a> | <a href="rbafzmstch1routines.htm">Next Page</a> | <a href="rbafzmst02.htm#wq1">Contents</a> |
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<a href="rbafzmstindex.htm#index">Index</a> ]
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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