114 lines
6.8 KiB
HTML
114 lines
6.8 KiB
HTML
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<meta name="DC.Title" content="Performance system values: Allow background database statistics collection" />
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<meta name="abstract" content="Specifies what requests are allowed to be processed by system job. (QDBFSTCCOL)" />
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<meta name="description" content="Specifies what requests are allowed to be processed by system job. (QDBFSTCCOL)" />
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<title>Performance system values: Allow background database statistics collection</title>
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</head>
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<body id="rzakzqdbfstccol"><a name="rzakzqdbfstccol"><!-- --></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">Performance system values: Allow background database statistics collection</h1>
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<div><p>Specifies what requests are allowed to be processed by system job.
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(QDBFSTCCOL)</p>
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<p><span class="uicontrol">Allow background database statistics collection</span>,
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also known as <span class="uicontrol">QDBFSTCCOL</span>, is a member of the performance
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category of i5/OS™ system
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values. You can use this system value to specify the types of requests for
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database file statistics collection that are allowed to be processed by system
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job, QDBFSTCCOL. To learn more, keep reading.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th colspan="2" valign="top" class="firstcol" id="d0e31">Quick reference</th>
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</tr>
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</thead>
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<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
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<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
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select your system, <span class="menucascade"><span class="uicontrol"></span> > <span class="uicontrol">Configuration
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and Service</span> > <span class="uicontrol">System Values</span> > <span class="uicontrol">Performance</span> > <span class="uicontrol">Database</span></span></td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
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<td valign="top" headers="d0e53 d0e31 ">None</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
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<td valign="top" headers="d0e58 d0e31 ">Allow user-created and system-generated database statistics</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
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<td valign="top" headers="d0e63 d0e31 ">Immediately</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
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<td valign="top" headers="d0e68 d0e31 ">No</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>Specifies
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the types of requests for database file statistics collection that are allowed
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to be processed by system job, QDBFSTCCOL. Statistical collections which are
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requested by either a user or automatically by the database manager to be
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processed in the foreground are not affected by this system value.</p>
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<p>The
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creator of a database file statistics collection request can specify either
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immediate or background processing. When immediate is specified, the statistics
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collection will be performed within the requester's process and control is
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not returned until the statistics collection is complete. The processing of
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immediate statistics collection requests are not affected by the setting of
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this system value. However, when background is specified, the request is queued
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to system job, QDBFSTCCOL, and control is returned immediately to the requesting
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process.</p>
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<p>System job, QDBFSTCCOL, can select to process requests from
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either user-created requests, system-generated requests, or both based on
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the value of this system value. Requests which are not selected will remain
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queued until either the system job is ready to process the request or the
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system value is changed to allow requests of that type to be processed.</p>
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<p>When
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this system value is changed to a more restricted value, the processing of
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statistic collection requests in progress in the statistics system job, that
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are not allowed at the new value, is ended. Their processing is restarted
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when this system value is changed back to a value that allows their processing.</p>
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<p>You
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may select one of the following types of requests, both (*ALL) types, or neither
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(*NONE):</p>
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<dl><dt class="dlterm">User-created requests (*USER)</dt>
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<dd>Indicates that user requested database file statistics collections are
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allowed to be processed by the database statistics system job.</dd>
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<dt class="dlterm">System-generated requests (*SYSTEM)</dt>
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<dd>Indicates that system-generated database file statistics collections are
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allowed to be processed by the database statistics system job.</dd>
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</dl>
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</div>
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<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
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learn more, go to the performance system values overview topic. If you are
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looking for a specific system value or category of system values, try using
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the i5/OS system
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value finder.</p>
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</div>
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</div>
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<div><div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakzperformanceoverview.htm" title="Use i5/OS performance system values to view and change priority, performance adjustments, and processing values for the system.">System values: Performance overview</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="rzakzfinder.htm">System value finder</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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