79 lines
4.7 KiB
HTML
79 lines
4.7 KiB
HTML
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<meta name="DC.Title" content="Library user disk pools" />
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<title>Library user disk pools</title>
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</head>
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<body id="hdrunolibusrasps"><a name="hdrunolibusrasps"><!-- --></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">Library user disk pools</h1>
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<div><p id="hdrunolibusrasps__v5r4"><a name="hdrunolibusrasps__v5r4"><!-- --></a>Library user disk pools contain libraries and user-defined file
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systems (UDFS). Library user disk pool steps are easier to recover than nonlibrary
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user disk pools. </p>
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<ul><li>Do not create system or product libraries (libraries that begin with a
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Q or #) or folders (folders that begin with a Q) in a user disk pool. Do not
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restore any of these libraries or folders to a user disk pool.
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Doing so can cause unpredictable results.</li>
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<li>Library disk pools may contain both libraries and document library objects.
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The document library for a user disk pool is called QDOCnnnn, where <em>nnnn</em> is
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the number of the disk pool.</li>
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<li>Journals and objects that are being journaled must be in the same disk
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pool. Place the journal receivers in a different disk pool. This protects
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against the loss of both the objects and the receivers if a disk media failure
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occurs. <p>In order to begin journaling, the journal (object type *JRN) and
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the object to be journaled must be in the same disk pool. Use the following
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commands to start journaling:</p>
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<ul><li>Start Journal Physical File (STRJRNPF) command for physical files</li>
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<li>Start Journal Access Path (STRJRNAP) command for access paths</li>
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<li>Start Journal (STRJRN) command for integrated file system objects</li>
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<li>Start Journal Object (STRJRNOBJ) command for other object types</li>
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</ul>
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<p>Journaling cannot be started again for an object that is saved and
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then restored to a different disk pool that does not contain the journal.
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The journal and the object must be in the same disk pool for journaling to
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be automatically started again for the object.</p>
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</li>
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<li>No database network can cross disk pool boundaries. You cannot create
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a file in one disk pool that depends on a file in a different disk pool. All
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based-on physical files for a logical file must be in the same disk pool as
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the logical file. The system builds access paths only for database files in
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the same disk pool as the based-on physical file (temporary queries are not
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limited). Access paths are never shared by files in different disk pools.
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Record formats are not shared between different disk pools. Instead, a format
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request is ignored and a new record format is created.</li>
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<li>You can place an SQL collection in a user disk pool. You specify the destination
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disk pool when you create the collection.</li>
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<li>If the library user disk pool does not contain any database files, set
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the destination access path recovery time for the disk pool to *NONE. This
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might be true, for example, if the library user disk pool contains only libraries
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for journal receivers. If you set the access path recovery time to *NONE,
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this prevents the system from doing unnecessary work for that disk pool. <a href="../rzaki/rzakismappintro.htm">System-managed
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access-path protection</a> describes how to set access path recovery times.</li>
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</ul>
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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="rzalyuserasp.htm">Basic disk pools</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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