54 lines
3.1 KiB
HTML
54 lines
3.1 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<!DOCTYPE html
|
||
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html lang="en-us" xml:lang="en-us">
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||
|
|
<meta name="security" content="public" />
|
||
|
|
<meta name="Robots" content="index,follow" />
|
||
|
|
<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))' />
|
||
|
|
<meta name="DC.Type" content="reference" />
|
||
|
|
<meta name="DC.Title" content="Example 2: Control how the system runs the Open Query File command" />
|
||
|
|
<meta name="abstract" content="This example shows how to optimize to minimize the number of records read." />
|
||
|
|
<meta name="description" content="This example shows how to optimize to minimize the number of records read." />
|
||
|
|
<meta name="DC.Relation" scheme="URI" content="rbafosropn.htm" />
|
||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
||
|
|
<meta name="DC.Format" content="XHTML" />
|
||
|
|
<meta name="DC.Identifier" content="rbafosropenex2" />
|
||
|
|
<meta name="DC.Language" content="en-us" />
|
||
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
||
|
|
<!-- US Government Users Restricted Rights -->
|
||
|
|
<!-- Use, duplication or disclosure restricted by -->
|
||
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
||
|
|
<title>Example 2: Control how the system runs the Open Query File command</title>
|
||
|
|
</head>
|
||
|
|
<body id="rbafosropenex2"><a name="rbafosropenex2"><!-- --></a>
|
||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
||
|
|
<h1 class="topictitle1">Example 2: Control how the system runs the Open Query File command</h1>
|
||
|
|
<div><p>This example shows how to optimize to minimize the number of records
|
||
|
|
read.</p>
|
||
|
|
<div class="section"><div class="p">Assume that you have multiple programs that will access the same
|
||
|
|
file which is built by the Open Query File (OPNQRYF) command. In this case,
|
||
|
|
you will want to optimize the performance so that the application programs
|
||
|
|
read only the data they are interested in. This means that you want OPNQRYF
|
||
|
|
to perform the selection as efficiently as possible. You can specify: <pre>OVRDBF FILE(FILEA) SHARE(*YES)
|
||
|
|
OPNQRYF FILE(FILEA) QRYSLT('CODE *EQ "B"') +
|
||
|
|
KEYFLD(CUST) OPTIMIZE(*MINWAIT)
|
||
|
|
CALL PGM(PGMA)
|
||
|
|
POSDBF OPNID(FILEA) POSITION(*START)
|
||
|
|
CALL PGM(PGMB)
|
||
|
|
CLOF OPNID(FILEA)
|
||
|
|
DLTOVR FILE(FILEA)</pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div>
|
||
|
|
<div class="familylinks">
|
||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafosropn.htm" title="The optimization function allows you to specify how you are going to use the results of the query.">Control how the system runs the Open Query File (OPNQRYF) command</a></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|