111 lines
8.1 KiB
HTML
111 lines
8.1 KiB
HTML
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<meta name="abstract" content="You can use the methods below to estimate the effect a journal receiver will have on auxiliary storage." />
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<title>Methods to estimate the size of a journal receiver</title>
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<body id="rzakiestimatercv"><a name="rzakiestimatercv"><!-- --></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">Methods to estimate the size of a journal receiver</h1>
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<div><p>You can use the methods below to estimate the effect a journal
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receiver will have on auxiliary storage.</p>
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<div class="section">The actual auxiliary storage used will be somewhat larger because
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the system writes additional entries for such actions as opening and closing
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objects unless you to omit open and close journal entries when start journaling
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for database physical files or integrated file system objects.</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="rzakibigrecvr.htm" title="Some optional functions available with journal management can significantly increase auxiliary storage requirements.">Functions that increase the journal receiver size</a></div>
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<div><a href="rzakiminendta.htm" title="On the Create Journal (CRTJRN) and Change Journal (CHGJRN) commands, you can specify to allow for the deposit of minimized journal entries. This will decrease the size of your journal entries.">Minimized entry-specific data for journal entries</a></div>
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<div><a href="rzakithreshold.htm" title="When you create a journal receiver with iSeries Navigator or the Create Journal Receiver (CRTJRNRCV) command, you specify a disk space threshold that indicates when you want the system to warn you or take action.">Threshold (disk space) for journal receivers</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzakistrjrnpf.htm" title="When you start journaling a physical file (table), you specify whether you want after-images saved, or both before-images and after-images.">Journal database physical files (tables)</a></div>
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<div><a href="rzakistrjrn.htm" title="You can journal the following integrated file system objects if they are in the "root"(/), QOpenSys, and user-defined file systems:">Journal integrated file system objects</a></div>
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<div><a href="rzakisetupjrngs.htm" title="Provides instructions on how to set up journals and journal receivers.">Set up journaling</a></div>
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<div><a href="rzakistrjrnl.htm" title="This topic provides information about how to start journaling for all object types.">Start journaling</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/dspjrnrcva.htm">Display Journal Receiver Attributes (DSPJRNRCVA) command</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzakisizecalc.htm">Journal receiver calculator</a></div>
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</div>
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</div><div class="nested1" xml:lang="en-us" id="method1cal"><a name="method1cal"><!-- --></a><h2 class="topictitle2">Method 1- Journal receiver calculator</h2>
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<div><div class="section"><p>Use Journal receiver calculator. The Journal receiver calculator
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provides an easy way for you to estimate the size of your journal receiver
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without setting up journaling.</p>
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<p>The calculator 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 minimizing entry-specific data for the files.</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="nested1" xml:lang="en-us" id="method2test"><a name="method2test"><!-- --></a><h2 class="topictitle2">Method 2 - Running a test</h2>
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<div><div class="section"><p>Another method for estimating the size of the journal receiver
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is to run a test. This method is more accurate because it includes all journal
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entries. Additionally, this method will work for any object type which can
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be journaled, not just database physical files unlike method one. To use this
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method, you must either have journaling set up already or you must set it
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up.</p>
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<p>If you are already using journaling, skip steps <a href="#method2test__rcvstep1">1</a> and <a href="#method2test__rcvstep2">2</a> below.
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Instead, issue a Display Journal Receiver Attributes (DSPJRNRCVA) command
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before the time period so you can compare sizes from the beginning of the
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period to the end.</p>
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<p>This method assumes that the same receiver is used
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during the whole test. If there is a change journal to attach a new journal
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receiver during the test, you must include the sizes of all the receivers.</p>
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</div>
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<ol><li id="method2test__rcvstep1"><a name="method2test__rcvstep1"><!-- --></a><span>Set up journaling by creating the receiver and journal.</span></li>
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<li id="method2test__rcvstep2"><a name="method2test__rcvstep2"><!-- --></a><span>Start journaling for all the objects that you plan
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to journal.</span></li>
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<li><span>Choose a time period (1 hour) with typical transaction rates.</span></li>
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<li><span>After one hour, use the Display Journal Receiver Attributes (DSPJRNRCVA)
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command to display the size of the receiver.</span></li>
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<li><span>Multiple the size by the number of hours that your system is active
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in a day.</span></li>
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</ol>
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</div>
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</div>
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</body>
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