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97 lines
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<meta name="abstract" content="Use this procedure to estimate the size of your journal receiver." />
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<title>Estimate the size of the journal receiver manually</title>
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<body id="rzakimanualestm"><a name="rzakimanualestm"><!-- --></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">Estimate the size of the journal receiver manually</h1>
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<div><p>Use this procedure to estimate the size of your journal receiver.</p>
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<div class="section"><p>This procedure assumes the following:</p>
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<ul><li>You are journaling after-images only.</li>
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<li>You are using a single journal receiver for an entire day's transactions.</li>
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<li>You are journaling database physical files only. It does not include estimates
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for access path journaling, integrated file system objects, data areas, data
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queues, or user-created entries.</li>
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<li>You are not using the MINENTDTA parameter to minimize entry-specific data
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for the files.</li>
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<li>Most of the journal entries are record-level (changes to
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records in a file) instead of object-level (like renaming or moving objects,
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ALTER TABLE requests, creating and deleting objects, etc).</li>
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</ul>
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<p>Follow the steps below to estimate the size of a journal receiver:</p>
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</div>
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<ol><li class="stepexpand" id="rzakimanualestm__LIRECLN"><a name="rzakimanualestm__LIRECLN"><!-- --></a><span>Determine the average record length for all the files
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that you plan to journal. If the record lengths vary significantly and the
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information is available, use a weighted average based on the relative number
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of transactions per file.</span></li>
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<li class="stepexpand" id="rzakimanualestm__fixlen"><a name="rzakimanualestm__fixlen"><!-- --></a><span>If you are not minimizing the fixed-length portion
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of the journal entry (not specifying RCVSIZOPT(*MINFIXLEN) on the CRTJRN command),
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you can specify the data that is included in the fixed-length portion (FIXLENDTA)
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of the journal entries. Find the sum of the bytes for the options you are
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using. Select the options from the following list:</span> <ul class="simple"><li>*JOB = 26 bytes</li>
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<li>*USR = 10 bytes</li>
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<li>*PGM = 10 bytes</li>
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<li>*PGMLIB = 22 bytes</li>
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<li>*SYSSEQ = 8 bytes</li>
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<li>*RMTADR = 20 bytes</li>
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<li>*THD = 8 bytes</li>
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<li>*LUW = 27 bytes</li>
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<li>*XID = 140 bytes</li>
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</ul>
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</li>
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<li class="stepexpand" id="rzakimanualestm__number"><a name="rzakimanualestm__number"><!-- --></a><span>Estimate the number of transactions for a day.</span></li>
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<li class="stepexpand"><span>The system-created portion of a journal entry is approximately
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50 bytes. (It varies by the type of journal entry.)</span></li>
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<li class="stepexpand"><span>Estimate the number bytes of auxiliary storage needed for one day's
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transactions by using the following formula: </span> <pre>Total bytes needed = (a+b+50)*c</pre>
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<p>where:</p>
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<ul class="simple"><li>a = the average record length of files (step <a href="#rzakimanualestm__LIRECLN">1</a>)</li>
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<li>b = sum of values selected for FIXLENDTA (step <a href="#rzakimanualestm__fixlen">2</a>)</li>
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<li>c = number of transactions for a day (step <a href="#rzakimanualestm__number">3</a>)</li>
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</ul>
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</li>
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</ol>
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<div class="section"><p>For example:</p>
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<ol><li>The average record length for journaled files is 115 bytes.</li>
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<li>*JOB, *USR, and *PGM options of FIXLENDTA are selected. Their sum is 46
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bytes.</li>
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<li>The number of journaled transactions per day is 10 000.</li>
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<li>The total bytes needed to journal after-images for a day is: <pre>(115+46+50) * 10 000 = 2 110 000</pre>
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</li>
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</ol>
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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="rzakiplnuseaux.htm" title="If you are journaling an object, journal management writes a copy of every object change to the journal receiver. It writes additional entries for object level activity, such as opening and closing the object, adding a member, or changing an object attribute. If you have a busy system and journal many objects, your journal receivers can quickly become very large.">Plan for journal use of auxiliary storage</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="rzakiintrusion.htm" title="You can use the Fixed Length Data (FIXLENDTA) parameter of Create Journal (CRTJRN) and Change Journal (CHGJRN) commands to audit security related activity for journaled objects on your system.">Fixed-length options for journal entries</a></div>
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</div>
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