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219 lines
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<meta name="DC.Title" content="System values: Performance overview" />
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<meta name="abstract" content="Use i5/OS performance system values to view and change priority, performance adjustments, and processing values for the system." />
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<title>System values: Performance overview</title>
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<body id="rzakzperformanceoverview"><a name="rzakzperformanceoverview"><!-- --></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">System values: Performance overview</h1>
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<div><p>Use i5/OS™ performance
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system values to view and change priority, performance adjustments, and processing
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values for the system.</p>
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<p>To access the performance category of system values, select <span class="uicontrol">Configuration
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and Services</span> in iSeries™ Navigator. Then, select <span class="uicontrol">System
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Values</span>.</p>
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<p>If you are familiar with the i5/OS character-based interface, you will
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notice that iSeries Navigator
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uses descriptive names for the system values. For a quick overview of the
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performance system values available in iSeries Navigator (and their counterparts
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in the character-based interface), refer to the following table. Follow the
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links to learn more about each system value.</p>
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<p>Performance system values:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><thead align="left"><tr><th valign="top" id="d0e100">Name in iSeries Navigator</th>
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<th valign="top" id="d0e105">Description of system value</th>
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<th valign="top" id="d0e107">Name in character-based interface</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e100 "><a href="rzakzqdynptyadj.htm">Dynamically adjust job priorities
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of interactive jobs</a></td>
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<td valign="top" headers="d0e105 ">Sets the job priorities of interactive jobs</td>
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<td valign="top" headers="d0e107 ">QDYNPTYADJ</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqdynptyscd.htm">Dynamically adjust job priorities
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within priority bands</a></td>
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<td valign="top" headers="d0e105 ">Sets job priorities within priority bands to be dynamically adjusted.</td>
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<td valign="top" headers="d0e107 ">QDYNPTYSCD</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqpfradj.htm">Automatically adjust memory pools and
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activity levels</a></td>
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<td valign="top" headers="d0e105 ">Specifies when to automatically adjust memory pools and activity levels.</td>
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<td valign="top" headers="d0e107 ">QPFRADJ</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqmaxactlvl.htm">Maximum eligible threads</a></td>
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<td valign="top" headers="d0e105 ">Specifies the maximum number of eligible threads.</td>
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<td valign="top" headers="d0e107 ">QMAXACTLVL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqmchpool.htm">Machine memory pool size</a></td>
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<td valign="top" headers="d0e105 ">Specifies the size of the machine memory pool.</td>
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<td valign="top" headers="d0e107 ">QMCHPOOL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqbaspool.htm">Base memory pool minimum size</a></td>
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<td valign="top" headers="d0e105 ">Specifies the minimum base memory pool.</td>
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<td valign="top" headers="d0e107 ">QBASPOOL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqbasactlvl.htm">Base memory pool maximum eligible
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threads</a></td>
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<td valign="top" headers="d0e105 ">Specifies maximum number of eligible threads.</td>
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<td valign="top" headers="d0e107 ">QBASACTLVL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqtsepool.htm">Move interactive jobs to base pool
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at end of time slice</a></td>
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<td valign="top" headers="d0e105 ">Specifies whether to move interactive jobs to base pool at the end
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of the time slice or not.</td>
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<td valign="top" headers="d0e107 ">QTSEPOOL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqcmnrcylmt.htm">Communications configuration recovery</a></td>
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<td valign="top" headers="d0e105 ">Specifies whether or not recovery attempts are made and how many attempts
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to take.</td>
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<td valign="top" headers="d0e107 ">QCMNRCYLMT</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqcmnarb.htm">Communications arbiter jobs, at restart</a></td>
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<td valign="top" headers="d0e105 ">Specifies the number of communications arbiter system jobs that are
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available to process work for controllers and devices.</td>
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<td valign="top" headers="d0e107 ">QCMNARB</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqpasthrsvr.htm">Available display station pass-through
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server jobs</a></td>
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<td valign="top" headers="d0e105 ">Specifies the number of target display station pass-through server
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jobs that are available to process i5/OS display station pass-through, iSeries Access
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workstation function (WSF), and other 5250 emulation programs on programmable
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workstations.</td>
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<td valign="top" headers="d0e107 ">QPASTHRSVR</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqqrydegree.htm">Parallel processing for queries and
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indexes</a></td>
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<td valign="top" headers="d0e105 ">Specifies whether to use parallel processing and what to use it for.</td>
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<td valign="top" headers="d0e107 ">QQRYDEGREE</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqqrytimlmt.htm">Database query time limit</a></td>
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<td valign="top" headers="d0e105 ">Sets the time limit for a database query.</td>
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<td valign="top" headers="d0e107 ">QQRYTIMLMT</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqliblcklvl.htm">Lock libraries in a user job's library
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search list</a></td>
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<td valign="top" headers="d0e105 ">Prevents other jobs from deleting or renaming the libraries in the
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search list.</td>
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<td valign="top" headers="d0e107 ">QLIBLCKLVL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqdbfstccol.htm">Allow background database statistics
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collection</a></td>
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<td valign="top" headers="d0e105 ">Specifies what requests are allowed to be processed by system job,
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QDBFSTCCOL.</td>
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<td valign="top" headers="d0e107 ">QDBFSTCCOL</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqthdrscafn.htm">Thread affinity</a></td>
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<td valign="top" headers="d0e105 ">Specifies whether or not secondary threads will have affinity to the
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same group of processors and memory as the initial thread.</td>
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<td valign="top" headers="d0e107 ">QTHDRSCAFN </td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e100 "><a href="rzakzqthdrscadj.htm">Automatically adjust thread resources</a></td>
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<td valign="top" headers="d0e105 ">Specifies whether or not the system should dynamically make adjustments
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to the affinity of threads currently running on the system.</td>
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<td valign="top" headers="d0e107 ">QTHDRSCADJ </td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e100 d0e105 d0e107 "> </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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<dl><dt class="dlterm">System values categories</dt>
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<dd> Find an introduction to all the categories of system values found in iSeries Navigator.</dd>
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</dl>
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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="rzakzqdynptyadj.htm" title="Sets the job priorities of interactive jobs (QDYNPTYADJ)">Performance system values: Dynamically adjust job priorities of interactive jobs</a></div>
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<div><a href="rzakzqdynptyscd.htm" title="Sets job priorities within priority bands to be dynamically adjusted. (QDYNPTYSCD)">Performance system values: Dynamically adjust job priorities within priority bands</a></div>
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<div><a href="rzakzqpfradj.htm" title="Specifies when to automatically adjust memory pools and activity levels. (QPFRADJ)">Performance system values: Automatically adjust memory pools and activity levels</a></div>
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<div><a href="rzakzqmaxactlvl.htm" title="Specifies the maximum number of eligible threads. (QMAXACTLVL)">Performance system values: Maximum eligible threads</a></div>
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<div><a href="rzakzqmchpool.htm" title="Specifies the size of the machine memory pool. (QMCHPOOL)">Performance system values: Machine memory pool size</a></div>
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<div><a href="rzakzqbaspool.htm" title="Specifies the minimum base memory pool. (QBASPOOL)">Performance system values: Base memory pool minimum size</a></div>
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<div><a href="rzakzqbasactlvl.htm" title="Specifies maximum number of eligible threads. (QBASACTLVL)">Performance system values: Base memory pool maximum eligible threads</a></div>
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<div><a href="rzakzqtsepool.htm" title="Specifies whether to move interactive jobs to base pool at the end of the time slice or not. (QTSEPOOL)">Performance system values: Move interactive jobs to base pool at end of time slice</a></div>
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<div><a href="rzakzqcmnrcylmt.htm" title="Specifies whether or not recovery attempts are made and how many attempts to take. (QCMNRCYLMT)">Performance system values: Communications configuration recovery</a></div>
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<div><a href="rzakzqcmnarb.htm" title="Specifies the number of communications arbiter system jobs that are available to process work for controllers and devices. (QCMNARB)">Performance system values: Communications arbiter jobs, at restart</a></div>
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<div><a href="rzakzqpasthrsvr.htm" title="Specifies the number of target display station pass-through server jobs that are available to process i5/OS display station pass-through, iSeries Access workstation function (WSF), and other 5250 emulation programs on programmable workstations. (QPASTHRSVR)">Performance system values: Available display station pass-through server jobs</a></div>
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<div><a href="rzakzqqrydegree.htm" title="Specifies whether to use parallel processing and what to use it for. (QQRYDEGREE)">Performance system values: Parallel processing for queries and indexes</a></div>
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<div><a href="rzakzqqrytimlmt.htm" title="Sets the time limit for a database query. (QQRYTIMLMT)">Performance system values: Database query time limit</a></div>
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<div><a href="rzakzqliblcklvl.htm" title="Prevents other jobs from deleting or renaming the libraries in the search list. (QLIBLCKLVL)">Performance system values: Lock libraries in a user job's library search list</a></div>
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<div><a href="rzakzqdbfstccol.htm" title="Specifies what requests are allowed to be processed by system job. (QDBFSTCCOL)">Performance system values: Allow background database statistics collection</a></div>
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<div><a href="rzakzqthdrscadj.htm" title="Specifies whether or not the system should dynamically make adjustments to the affinity of threads currently running on the system. (QTHDRSCADJ)">Performance system values: Automatically adjust thread resources</a></div>
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<div><a href="rzakzqthdrscafn.htm" title="Specifies whether or not secondary threads will have affinity to the same group of processors and memory as the initial thread. (QTHDRSCAFN)">Performance system values: Thread affinity</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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