111 lines
8.0 KiB
HTML
111 lines
8.0 KiB
HTML
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<meta name="DC.Title" content="Considerations for entries which contain minimized entry-specific data" />
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<meta name="abstract" content="Reduce the size of journal receivers by specifying minimized entry-specific data on the Create Journal (CRTJRN) and Change Journal (CHGJRN) commands." />
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<title>Considerations for entries which contain minimized entry-specific data</title>
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<body id="rzakiwrkminendta"><a name="rzakiwrkminendta"><!-- --></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">Considerations for entries which contain minimized entry-specific data</h1>
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<div><p>Reduce the size of journal receivers by specifying minimized entry-specific
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data on the Create Journal (CRTJRN) and Change Journal (CHGJRN) commands.</p>
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<p>If you have selected to use the MINENTDTA parameter for the journal, then
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some of your journal entries' entry-specific data will be minimized. The entries
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will only be minimized if the minimization technique will deposit a journal
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entry which is smaller in size than the complete entry would be. Use the
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Journal entry information finder to see which specific journal entry types
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can possibly be minimized. When the entry is minimized, the fixed-length portion
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of the journal entry will have the minimized entry-specific data indicator
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on. Currently, only data areas and database physical files can have their
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entry-specific data minimized.</p>
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<div class="section"><h4 class="sectiontitle">Data area considerations</h4><p>The layout of the data
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area entries which are minimized is exactly the same as the layout if the
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entry was not minimized. The only difference is that only the bytes which
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actually changed are deposited rather than depositing all the bytes on the
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change request. See Update data area journal entries for the entry layout
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of the change data area entries.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Database physical file considerations</h4><p><img src="./delta.gif" alt="Start of change" />The
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layout of the minimized record changes entries is completely different than
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the layout when the entry is not minimized. If MINENTDTA(*FILE) is used, the
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data is not readable because sophisticated hash techniques are used in addition
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to only operating on actual changed bytes. Additionally, the Null-value-indicators
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field will be used, even if the file is not null capable, to provide additional
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information that can be used by database operations. Therefore, if you want
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to use the journal as an audit mechanism, you may not want to choose the MINENTDTA(*FILE)
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option for database physical files since you will not be able to read the
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actual change made.<img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />If minimized journal entries are collected
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on field boundaries using the MINENTDTA(*FLDBDY) option, the data within the
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journal entries may be displayed in the recognizable record layout of the
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file. When this option is used, fields that were not collected will display
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default data and the null value indicator table will use a new value to indicate
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which fields are showing the actual data versus which ones are showing default
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data because the fields were not collected. A ‘9’ in the null value field
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will indicate the data is not actual data and that it was filled in with default
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data. <img src="./deltaend.gif" alt="End of change" /></p>
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<p>Even if the file is not null capable, the Null value
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indicators field is used to provide additional information that can be used
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by database operations. Therefore, if you want to use the journal for auditing
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purposes, you may want to use the *FLDBDY value on the Minimized entry specific
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data (MINENTDTA) parameter for the CRTJRN and CHGJRN commands discussed below.
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</p>
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</div>
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<div class="section"><img src="./delta.gif" alt="Start of change" /><h4 class="sectiontitle">View minimized entry-specific data</h4><p><img src="./delta.gif" alt="Start of change" />The
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*FLDBDY value indicates that minimizing of record level changes should be
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done on field/column boundaries for all files journaled to the specified journal.
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Using the <span class="cmdname">Display Journal (DSPJRN)</span> command, entries are
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viewable to the screen, an outfile, or printed output. If a journal entry
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has been minimized on field boundaries, the value of 2 is returned in the
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Minimized entry specific data field of the *OUTFILE and in the Min field of
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the printed output. The <span class="cmdname">RCVJRNE</span> and <span class="cmdname">RTVJRNE</span> commands
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can also be used to view entries that were minimized on field boundaries by
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specifying *YES on the Format minimized data (FMTMINDTA) parameter. The <span class="apiname">QjoRetrieveJournalEntries</span> API
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can be used to view entries that were minimized on field boundaries by specifying
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*YES for the Format minimized data (FMTMINDTA) key.<img src="./deltaend.gif" alt="End of change" /></p>
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<img src="./deltaend.gif" alt="End of change" /></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="rzakiwrkjrninfo.htm" title="Provides ways that you can display, retrieve, and receive journal entries.">Work with journal entry information</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="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="rzakivarlength.htm" title="The following tables contain the variable-length portion of the layouts for journal entries.">Layouts for variable-length portion of journal entries</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/crtjrn.htm">Create Journal (CRTJRN) command</a></div>
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<div><a href="../cl/chgjrn.htm">Change Journal (CHGJRN) 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="rzakifinder.htm">Journal entry information finder</a></div>
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</div>
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</div>
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</body>
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