128 lines
7.6 KiB
HTML
128 lines
7.6 KiB
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<meta name="DC.Title" content="Multiple system libraries" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2002, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Multiple system libraries</title>
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</head>
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<body id="rzalymultiplesystemlibraries"><a name="rzalymultiplesystemlibraries"><!-- --></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">Multiple system libraries</h1>
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<div><p>In general, all system libraries continue to exist in the system disk
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pool. However, to support better isolation and recovery of the independent
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disk pool group containing system libraries, the following instances of system
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libraries are also created in the primary disk pool:</p>
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<ol><li><strong>QSYSnnnnn</strong>: This contains the database cross reference information
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for the database represented by the disk pool group. Normally only internal
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system code creates objects into this library.</li>
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<li><strong>QSYS2nnnnn</strong>: This contains the SQL catalogues for the database
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represented by the disk pool group. Normally only internal system code creates
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objects into this library.</li>
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<li><strong>QRCYnnnnn</strong>: Any recovery object associated with objects within the
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disk pool group is stored in this library for the primary disk pool for
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the group. These objects may be needed for recovery when the disk pool group
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is varied on. The system disk pool equivalent of this library is QRECOVERY
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.</li>
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<li><strong>QRCLnnnnn</strong>: When the reclaim instance is run on the disk pool group,
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any resulting information normally stored in QRCL is now stored in the QRCL
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of the primary disk pool for the group. Normally only functions called during
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reclaim storage processing create objects into this library instance. Also,
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when reclaim storage recovers the addressability of lost objects, these objects
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can be inserted into the QRCLnnnnn library. These are user objects that originally
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existed in another library. </li>
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<li><strong>QRPLnnnnn</strong>: Whenever an object contained within the disk pool group
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is replaced while it is in use, the in-use object is renamed and moved to
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the QRPLnnnnn library in the primary disk pool for the group. The new object
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is inserted into the specified library. The system disk pool equivalent of
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this library is QRPLOBJ. QRPLnnnnn is cleared at vary on.</li>
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</ol>
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<p>In the above, nnnnn is the independent disk pool number right-aligned and
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padded with zeros.</p>
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<p>One new library attribute, Protected, is introduced to support the extended
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library capability. Since the libraries QSYSnnnnn, QSYS2nnnnn, and SYSIBnnnnn
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are special versions that correspond to the system libraries, only operating
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system code can create objects into them. Applications cannot create objects
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into these libraries.</p>
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<div class="section"><h4 class="sectiontitle">Library attribute settings</h4><div class="p">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><thead align="left"><tr class="tablemainheaderbar"><th class="oddrowblue" align="left" valign="top" width="15%" id="d0e50">Library</th>
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<th class="oddrowblue" align="left" valign="top" width="15%" id="d0e52">*SYSBAS library</th>
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<th class="oddrowblue" align="center" valign="top" width="35%" id="d0e54">Protected in
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independent disk pool</th>
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<th class="oddrowblue" align="center" valign="top" width="35%" id="d0e56">Protected
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in system disk pool</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="15%" headers="d0e50 ">QSYSnnnnn</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">QSYS</td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">Yes </td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</td>
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</tr>
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<tr><td align="left" valign="top" width="15%" headers="d0e50 ">QSYS2nnnnn</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">QSYS2</td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">Yes</td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</td>
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</tr>
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<tr><td align="left" valign="top" width="15%" headers="d0e50 ">SYSIBnnnnn</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">SYSIBM </td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">Yes</td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</td>
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</tr>
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<tr><td align="left" valign="top" width="15%" headers="d0e50 ">QRCLnnnnn</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">QRCL</td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">No</td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</td>
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</tr>
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<tr><td align="left" valign="top" width="15%" headers="d0e50 ">QRCYnnnnn</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">QRECOVERY</td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">No</td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</td>
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</tr>
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<tr><td align="left" valign="top" width="15%" headers="d0e50 ">QRPLnnnnn</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">QRPLOBJ</td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">No</td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</td>
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</tr>
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<tr><td align="left" valign="top" width="15%" headers="d0e50 ">All user libs</td>
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<td align="left" valign="top" width="15%" headers="d0e52 ">Not applicable</td>
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<td align="center" valign="top" width="35%" headers="d0e54 ">No</td>
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<td align="center" valign="top" width="35%" headers="d0e56 ">No</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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<p>The normal search order for objects is to search the libraries
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based on the user-specified library value, the user's library list, and the
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namespace in effect for the job. The only exception to this occurs when the
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user job has a disk pool group in the job's namespace. In this case, aliasing
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support takes effect for object references to the database control objects
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in QSYS, QSYS2, and SYSIBM. The objects in the QSYSnnnnn, QSYS2nnnnn, and
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SYSIBnnnnn libraries are returned so that users are operating on the database
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control information associated with their extended namespace. </p>
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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="rzalyhowiaspswork.htm">How independent disk pools work</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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