708 lines
22 KiB
HTML
708 lines
22 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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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="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Change Pool Tuning Information (QWCCHGTN) API</title>
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<!-- Begin Header Records ========================================= -->
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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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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- WM SCRIPT A converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Change History: -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>Change Pool Tuning Information (QWCCHGTN) API</h2>
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<div class="box" style="width: 80%;">
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<br>
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Required Parameter Group:<br>
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<!-- iddvc RMBR -->
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<br>
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<table width="100%">
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<tr>
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<td align="center" valign="top" width="10%">1</td>
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<td align="left" valign="top" width="50%">System pool identifier</td>
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<td align="left" valign="top" width="20%">Input</td>
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<td align="left" valign="top" width="20%">Binary(4)</td>
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</tr>
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<tr>
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<td align="center" valign="top">2</td>
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<td align="left" valign="top">Change request</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(*)</td>
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</tr>
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<tr>
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<td align="center" valign="top">3</td>
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<td align="left" valign="top">Length of change request</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Binary(4)</td>
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</tr>
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<tr>
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<td align="center" valign="top">4</td>
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<td align="left" valign="top">Format name</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(8)</td>
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</tr>
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<tr>
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<td align="center" valign="top">5</td>
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<td align="left" valign="top">Error code</td>
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<td align="left" valign="top">I/O</td>
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<td align="left" valign="top">Char(*)</td>
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</tr>
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</table>
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<br>
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Default Public Authority: *EXCLUDE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: No<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The Change Pool Tuning Information (QWCCHGTN) API changes information about
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tuning being performed by the system for the different storage pools. The
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Materialize Resource Management Data (MATRMD) machine interface (MI)
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instruction can be used to retrieve the current setting of the tuning
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parameters.</p>
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<br>
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<!-- Please NOTE: DO NOT DELETE THIS SECTION if this API has no authorities and locks. -->
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<!-- Instead, use the commented out coding below to indicate NONE. -->
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<h3>Authorities and Locks</h3>
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<!-- Use this if there are no authorities and locks. -->
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<p>None.</p>
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<br>
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<h3>Required Parameter Group</h3>
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<dl>
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<dt><strong>System pool identifier</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>The pool is to be changed. This number corresponds to the number returned on
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option 9 of the Materialize Resource Management Data (MATRMD) MI instruction.
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This also corresponds to the identifier shown on the Work with System Status
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display. This parameter is a value ranging from 2 through 64, where pool 2 is
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the base pool.</p>
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</dd>
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<dt><strong>Change request</strong></dt>
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<dd>INPUT; CHAR(*)
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<p>The variable containing the new tuning information. See <a href="#HDRTUNI1">
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TUNI0100 Format</a> for the definition of the fields for this parameter.</p>
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</dd>
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<dt><strong>Length of change request</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>The length of the change request list. This area must be as large as the
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format specified.</p>
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</dd>
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<dt><strong>Format name</strong></dt>
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<dd>INPUT; CHAR(8)
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<p>The format of the information to be changed. The valid values are:</p>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top"><em>TUNI0100</em></td>
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<td align="left" valign="top">Tuning information for a storage pool.</td>
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</tr>
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</table>
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<br>
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</dd>
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<dt><strong>Error code</strong></dt>
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<dd>I/O; CHAR(*)
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<p>The structure in which to return error information. For the format of the
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structure, see <a href="../apiref/error.htm#hdrerrcod">Error Code Parameter</a>.</p>
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</dd>
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</dl>
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<br>
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<h3><a name="HDRTUNI1">TUNI0100 Format</a></h3>
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<p>The following table shows the information that must be specified in the
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change request parameter when format TUNI0100 is specified. For a detailed
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description of each field, see <a href="#HDRTUNI1D">Field Descriptions</a>.</p>
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<table border width="80%">
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<tr>
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<th align="center" valign="bottom" colspan="2">Offset</th>
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<th align="left" valign="bottom" rowspan="2">Type</th>
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<th align="left" valign="bottom" rowspan="2">Field</th>
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</tr>
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<tr>
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<th align="center" valign="bottom">Dec</th>
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<th align="center" valign="bottom">Hex</th>
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</tr>
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<tr>
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<td align="center" valign="top" width="10%">0</td>
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<td align="center" valign="top" width="10%">0</td>
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<td align="left" valign="top" width="20%">CHAR(1)</td>
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<td align="left" valign="top" width="60%">Type of tuning</td>
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</tr>
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<tr>
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<td align="center" valign="top">1</td>
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<td align="center" valign="top">1</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Change page handling</td>
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</tr>
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<tr>
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<td align="center" valign="top">2</td>
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<td align="center" valign="top">2</td>
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<td align="left" valign="top">BINARY(4)</td>
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<td align="left" valign="top">Blocking factor for nondatabase objects</td>
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</tr>
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<tr>
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<td align="center" valign="top">6</td>
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<td align="center" valign="top">6</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Allow exchange operations (for class 1 objects in
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pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">7</td>
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<td align="center" valign="top">7</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Type of transfer from main storage to auxiliary
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storage (for class 1 objects in pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">8</td>
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<td align="center" valign="top">8</td>
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<td align="left" valign="top">BINARY(4)</td>
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<td align="left" valign="top">Blocking factor for database (class 1)
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objects</td>
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</tr>
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<tr>
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<td align="center" valign="top">12</td>
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<td align="center" valign="top">C</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Allow exchange operations (for class 2 objects in
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pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">13</td>
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<td align="center" valign="top">D</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Type of transfer from main storage to auxiliary
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storage (for class 2 objects in pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">14</td>
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<td align="center" valign="top">E</td>
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<td align="left" valign="top">BINARY(4)</td>
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<td align="left" valign="top">Blocking factor for database (class 2)
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objects</td>
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</tr>
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<tr>
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<td align="center" valign="top">18</td>
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<td align="center" valign="top">12</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Allow exchange operations (for class 3 objects in
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pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">19</td>
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<td align="center" valign="top">13</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Type of transfer from main storage to auxiliary
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storage (for class 3 objects in pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">20</td>
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<td align="center" valign="top">14</td>
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<td align="left" valign="top">BINARY(4)</td>
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<td align="left" valign="top">Blocking factor for database (class 3)
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objects</td>
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</tr>
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<tr>
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<td align="center" valign="top">24</td>
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<td align="center" valign="top">18</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Allow exchange operations (for class 4 objects in
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pool)</td>
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</tr>
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<tr>
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<td align="center" valign="top">25</td>
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<td align="center" valign="top">19</td>
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<td align="left" valign="top">CHAR(1)</td>
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<td align="left" valign="top">Type of transfer from main storage (for class 4
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objects in pool) to auxiliary storage</td>
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</tr>
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<tr>
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<td align="center" valign="top">26</td>
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<td align="center" valign="top">1A</td>
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<td align="left" valign="top">BINARY(4)</td>
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<td align="left" valign="top">Blocking factor for database (class 4)
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objects</td>
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</tr>
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</table>
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<p>When tuning is requested (values 1, 2, or 3 for the type of tuning field),
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the system periodically categorizes database objects into four different
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performance classes. The classes are:</p>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top" width="10%"><em>Class 1</em></td>
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<td align="left" valign="top" width="90%">Object access appears to be random. A disk access
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is required for nearly each record that is accessed.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>Class 2</em></td>
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<td align="left" valign="top">Locality of reference detected. Several records
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are being accessed per disk access.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>Class 3</em></td>
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<td align="left" valign="top">High locality of reference detected. The object
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is being processed in a sequential manner; references are highly clustered and
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large portions of the object are resident in main storage.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>Class 4</em></td>
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<td align="left" valign="top">The class of a database object is adjusted if the
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object's size is small in comparison to the available storage in the storage
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pool. This class adjustment involves adding 1 to the class number; therefore, a
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class 3 database object (as defined above) would be treated as a class 4 if it
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were small in comparison to the available storage in the storage pool.</td>
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</tr>
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</table>
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<p>Reference information for determining an object's class is collected
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periodically. It is collected by storage pool because an object's class varies
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over time and by storage pool.</p>
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<p><strong>Note:</strong> When a new system pool is created as a result of
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starting a subsystem, the type of tuning and change page handling attributes
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for the new system pool are initialized based on the type of storage pool being
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created. For shared storage pools, the type of tuning and change page handling
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attributes are set based on the paging option defined for the shared storage
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pool. For private storage pools, the type of tuning attribute is set to
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indicate no tuning should be done and the change page handling attribute is set
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to the system default value.</p>
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<br>
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<h3><a name="HDRTUNI1D">Field Descriptions</a></h3>
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<p><strong>Allow exchange operations.</strong> The exchange operation used to
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reduce the working set size. This is done by overlaying data that is already in
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main storage with new data this is being brought into main storage. The values
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for this field are:</p>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top">Use the system default, which is 1 (allow
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exchange operations)</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>1</em></td>
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<td align="left" valign="top">Allow exchange operations</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>2</em></td>
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<td align="left" valign="top">Disable exchange operations</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>3</em></td>
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<td align="left" valign="top">Disable exchange operations (The data that
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already exists in main storage should be a good candidate to be replaced when
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additional storage is needed in the storage pool.)</td>
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</tr>
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</table>
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<p>The value specified for this field is ignored unless static tuning is
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specified for the type of tuning field.</p>
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<p><strong>Blocking factor for database objects.</strong> The amount of data
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that should be brought into main storage when a request is made to read
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database objects from auxiliary storage. The values for this field are:</p>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top">Use the system default, which is 4 (transfer data
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into main storage in 4KB blocks)</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>4</em></td>
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<td align="left" valign="top">Transfer data into main storage in 4KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>8</em></td>
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<td align="left" valign="top">Transfer data into main storage in 8KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>16</em></td>
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<td align="left" valign="top">Transfer data into main storage in 16KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>32</em></td>
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<td align="left" valign="top">Transfer data into main storage in 32KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>64</em></td>
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<td align="left" valign="top">Transfer data into main storage in 64KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>128</em></td>
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<td align="left" valign="top">Transfer data into main storage in 128KB
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blocks</td>
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</tr>
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</table>
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<p>The system may need to issue multiple I/O operations to bring the data into
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main storage. The value specified for the blocking factor for database objects
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field is ignored unless static tuning is specified for the type of tuning
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field.</p>
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<p><strong>Blocking factor for nondatabase objects.</strong> The amount of data
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that should be brought into main storage when a request is made to read
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nondatabase objects from auxiliary storage. The possible values for this field
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are:</p>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top">Use the system default, which is 4 (transfer data
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into main storage in 4KB blocks)</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>4</em></td>
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<td align="left" valign="top">Transfer data into main storage in 4KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>8</em></td>
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<td align="left" valign="top">Transfer data into main storage in 8KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>16</em></td>
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<td align="left" valign="top">Transfer data into main storage in 16KB
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blocks</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>32</em></td>
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<td align="left" valign="top">Transfer data into main storage in 32KB
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blocks</td>
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</tr>
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</table>
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<p>The system may need to issue multiple I/O operations to bring the data into
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main storage. The value specified for the blocking factor for nondatabase
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objects is ignored unless static tuning is specified for the type of tuning
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field.</p>
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<p><strong>Change page handling.</strong> The method the system uses to
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determine when to write changed pages to auxiliary storage. The values for this
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field are:</p>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top">Use the system default, which is 1 (Changed pages
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should be written to auxiliary storage when there is a demand for pages in a
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storage pool.)</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>1</em></td>
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<td align="left" valign="top">Changed pages should be written to auxiliary
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storage when there is a demand for pages in a storage pool</td>
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</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>2</em></td>
|
|
<td align="left" valign="top">In addition to writing changed pages on demand,
|
|
periodically write changed pages to auxiliary storage</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p><strong>Type of transfer from main storage to auxiliary storage.</strong>
|
|
The method the system uses to process a request to write an object to auxiliary
|
|
storage. The values for this field are:</p>
|
|
|
|
<table cellpadding="5">
|
|
<!-- cols="5 95" -->
|
|
<tr>
|
|
<td align="left" valign="top"><em>0</em></td>
|
|
<td align="left" valign="top">Use the system default, which is 1 (When objects
|
|
are changed, write the changes to auxiliary storage. Indicate that the portion
|
|
of the object that was written to auxiliary storage should be a good candidate
|
|
to be replaced when additional storage is needed in the storage pool.)</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>1</em></td>
|
|
<td align="left" valign="top">When objects are changed, write the changes to
|
|
auxiliary storage. Indicate that the portion of the object that was written to
|
|
auxiliary storage should be a good candidate to be replaced when additional
|
|
storage is needed in the storage pool.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>2</em></td>
|
|
<td align="left" valign="top">When objects are changed, write the changes to
|
|
auxiliary storage.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>3</em></td>
|
|
<td align="left" valign="top">Do not immediately write the changes to auxiliary
|
|
storage. Indicate that the portion of the object that was changed should be a
|
|
good candidate to be replaced when additional storage is needed in the storage
|
|
pool.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>4</em></td>
|
|
<td align="left" valign="top">Do not immediately write the changes to auxiliary
|
|
storage.</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p>The value specified for this field is ignored unless static tuning is
|
|
specified for the type of tuning field.</p>
|
|
|
|
<p><strong>Type of tuning.</strong> The method used by the system to tune the
|
|
storage pool. The values for this field are:</p>
|
|
|
|
<table cellpadding="5">
|
|
<!-- cols="5 95" -->
|
|
<tr>
|
|
<td align="left" valign="top"><em>0</em></td>
|
|
<td align="left" valign="top">No tuning is being performed for this pool.
|
|
|
|
<p>All values specified for the blocking factor, the allow exchange operations,
|
|
and the type of transfer from main storage to auxiliary storage fields are
|
|
ignored. The system default values are used for all these fields.</p>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>1</em></td>
|
|
<td align="left" valign="top">Static tuning is being performed for this pool.
|
|
Static tuning implies that the values specified for blocking factor, exchange
|
|
operation, and transfers to auxiliary storage are not dynamically adjusted by
|
|
the system.
|
|
|
|
<p>Values must be specified for the blocking factor, allow exchange operations,
|
|
and type of transfer from main storage to auxiliary storage for the storage
|
|
pools.</p>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>2</em></td>
|
|
<td align="left" valign="top">Dynamic tuning of transfers into main storage is
|
|
being performed. This indicates that the system is dynamically adjusting the
|
|
blocking factor and exchange operations.
|
|
|
|
<p>Because the values for blocking factor and allow exchange operations are
|
|
dynamically adjusted, the values specified on the API are ignored. The value
|
|
used for the transfer to auxiliary storage field is set to ensure that requests
|
|
to write data to auxiliary storage are processed immediately.</p>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top"><em>3</em></td>
|
|
<td align="left" valign="top">Dynamic tuning of transfers into main storage and
|
|
to auxiliary storage is being performed. This indicates that the system is
|
|
dynamically adjusting the blocking factor, exchange operations, and transfers
|
|
to auxiliary storage.
|
|
|
|
<p>Because the values for the blocking factor, allow exchange operations, and
|
|
transfers to auxiliary storage are dynamically adjusted, the values specified
|
|
on the API are ignored.</p>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<br>
|
|
|
|
|
|
<h3>Error Messages</h3>
|
|
|
|
<table width="100%" cellpadding="5">
|
|
<!-- cols="15 85" -->
|
|
<tr>
|
|
<th align="left" valign="top">Message ID</th>
|
|
<th align="left" valign="top">Error Message Text</th>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top" width="15%">CPF1001 E</td>
|
|
<td align="left" valign="top" width="85%">Wait time expired for system
|
|
response.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1870 E</td>
|
|
<td align="left" valign="top">Value &1 for type of tuning not valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1871 E</td>
|
|
<td align="left" valign="top">Value &1 for change page handling not
|
|
valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1872 E</td>
|
|
<td align="left" valign="top">Value &1 for blocking factor not valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1873 E</td>
|
|
<td align="left" valign="top">Value &1 for exchange operation not
|
|
valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1874 E</td>
|
|
<td align="left" valign="top">Value &1 for transfer to auxiliary storage
|
|
not valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1875 E</td>
|
|
<td align="left" valign="top">Value &1 for change request length not
|
|
valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF1876 E</td>
|
|
<td align="left" valign="top">Value &1 for pool number not valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF24B4 E</td>
|
|
<td align="left" valign="top">Severe error while addressing parameter
|
|
list.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF3CF1 E</td>
|
|
<td align="left" valign="top">Error code parameter not valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF3CF2 E</td>
|
|
<td align="left" valign="top">Error(s) occurred during running of &1
|
|
API.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF3C21 E</td>
|
|
<td align="left" valign="top">Format name &1 is not valid.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF3C90 E</td>
|
|
<td align="left" valign="top">Literal value cannot be changed.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td align="left" valign="top">CPF9872 E</td>
|
|
<td align="left" valign="top">Program or service program &1 in library
|
|
&2 ended. Reason code &3.</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<br>
|
|
<hr>
|
|
API introduced: V2R3
|
|
|
|
<hr>
|
|
<center>
|
|
<table cellpadding="2" cellspacing="2">
|
|
<tr align="center">
|
|
<td valign="middle" align="center"><a href="#Top">Top</a> | <a href="wm1.htm">
|
|
Work Management APIs</a> | <a href="aplist.htm">APIs by category</a></td>
|
|
</tr>
|
|
</table>
|
|
</center>
|
|
</body>
|
|
</html>
|
|
|