79 lines
4.7 KiB
HTML
79 lines
4.7 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Title" content="Database considerations for save and restore" />
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<meta name="abstract" content="This topic provides tips for working with the save and restore functions." />
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<meta name="description" content="This topic provides tips for working with the save and restore functions." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Database considerations for save and restore</title>
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</head>
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<body id="rbaforzahfprc"><a name="rbaforzahfprc"><!-- --></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">Database considerations for save and restore</h1>
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<div><p>This topic provides tips for working with the save and restore
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functions.</p>
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<ul><li>When you save an object to a save file, you can prevent the system from
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updating the date and time of the save operation by specifying UPDHST(*NO)
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on the save command.</li>
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<li>When you restore an object, the system always updates the object description
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with the date and time of the restore operation. Display the object description
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and other save/restore related information by using the Display Object Description
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(DSPOBJD) command with DETAIL(*FULL).</li>
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<li>To display the objects in a save file, use the Display Save File (DSPSAVF)
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command.</li>
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<li>To display the objects on the media, specify DATA(SAVRST) on the Display
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Diskette (DSPDKT) or Display Tape (DSPTAP) command.</li>
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<li>To display the last save/restore date for a database file, type: DSPFD
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FILE(file-name) TYPE(*MBR).</li>
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</ul>
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<p>Also consider automatically writing records to auxiliary storage. </p>
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<div class="section" id="rbaforzahfprc__rbaforzahfprh"><a name="rbaforzahfprc__rbaforzahfprh"><!-- --></a><h4 class="sectiontitle">Force-writing data to auxiliary
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storage</h4><p>The force-write ratio (FRCRATIO) parameter on the create
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file and override database file commands indicates how often the records are
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to be written to auxiliary storage.</p>
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<p>A force-write ratio of one immediately
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writes every add, update, and delete request to auxiliary storage for the
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file in question. However, choosing this option can reduce system performance.
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Therefore, consider saving your files and journaling your files as the primary
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methods for protecting database files.</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="rbaforzahfpra.htm" title="These topics discuss the iSeries functions of recovering or restoring your database after the system loses data.">Recover and restore your database</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="../books/sc415304.pdf" target="_blank">Backup and Recovery PDF</a></div>
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<div><a href="../rzahg/rzahgbackup.htm">Backup and recovery</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/dspobjd.htm">Display Object Description (DSPOBJD) command</a></div>
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<div><a href="../cl/dspsavf.htm">Display Save File (DSPSAVF) command</a></div>
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<div><a href="../cl/dsptap.htm">Display Tape (DSPTAP) command</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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