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43 KiB
HTML
667 lines
43 KiB
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="QAQQINI query options" />
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<meta name="abstract" content="There are different options available for parameters in the QAQQINI file." />
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<meta name="description" content="There are different options available for parameters in the QAQQINI file." />
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<meta name="DC.subject" content="query options file, changing, file, query options, query options, QAQQINI, command (CL)" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<title>QAQQINI query options</title>
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</head>
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<body id="qryopt"><a name="qryopt"><!-- --></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">QAQQINI query options</h1>
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<div><p>There are different options available for parameters in the QAQQINI
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file.</p>
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<div class="section"><p>The following table summarizes the query options that can be specified
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on the QAQQINI command:</p>
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</div>
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<div class="tablenoborder"><img src="./delta.gif" alt="Start of change" /><a name="qryopt__qryoptable"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="qryopt__qryoptable" width="100%" frame="border" border="1" rules="all"><caption>Table 1. Query
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Options Specified on QAQQINI Command</caption><thead align="left"><tr><th align="center" valign="middle" width="31.90255220417633%" id="d0e47">Parameter</th>
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<th align="center" valign="middle" width="15.19721577726218%" id="d0e49">Value</th>
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<th align="center" valign="middle" width="52.90023201856149%" id="d0e51">Description</th>
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</tr>
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</thead>
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<tbody><tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>ALLOW_TEMPORARY_INDEXES</p>
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</td>
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<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *YES.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">Allow temporary indexes to be considered.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*ONLY_ REQUIRED</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">Do not allow any temporary indexes to be considered
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for this access plan. Choose any other implementation regardless of cost to
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avoid the creation of a temporary index. Only if no viable plan can be found,
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will a temporary index be allowed. </td>
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</tr>
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<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>APPLY_REMOTE</p>
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</td>
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<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *YES.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The <span class="cmdname">CHGQRYA</span> attributes
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for the job are not applied to the remote jobs. The remote jobs will use the
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attributes associated to them on their servers.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The query attributes for the job are applied
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to the remote jobs used in processing database queries involving distributed
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tables. For attributes where *SYSVAL is specified, the system value on the
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remote server is used for the remote job. This option requires that, if <span class="cmdname">CHGQRYA</span> was
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used for this job, the remote jobs must have authority to use the <span class="cmdname">CHGQRYA</span> command.</td>
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</tr>
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<tr><td rowspan="5" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>ASYNC_JOB_USAGE</p>
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</td>
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<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *LOCAL.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*LOCAL</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Asynchronous jobs may be used for database
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queries that involve only tables local to the server where the database queries
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are being run. In addition, for queries involving distributed tables, this
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option allows the communications required to be asynchronous. This allows
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each server involved in the query of the distributed tables to run its portion
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of the query at the same time (in parallel) as the other servers.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DIST</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Asynchronous jobs may be used for database
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queries that involve distributed tables.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*ANY</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Asynchronous jobs may be used for any database
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query.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NONE</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">No asynchronous jobs are allowed to be used
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for database query processing. In addition, all processing for queries involving
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distributed tables occurs synchronously. Therefore, no inter-system parallel
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processing will occur.</td>
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</tr>
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<tr><td rowspan="4" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>CACHE_RESULTS</p>
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</td>
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<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is the same as *SYSTEM.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*SYSTEM</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The database manager may cache a query result
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set. A subsequent run of the query by that job or, if the ODP for the query
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has been deleted, by any job, will consider reusing the cached result set.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*JOB</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The database manager may cache a query result
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set from one run to the next for a job, as long as the query uses a reusable
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ODP. When the reusable ODP is deleted, the cached result set is destroyed.
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This value mimics V5R2 processing.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NONE</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The database does not cache any query results.</td>
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</tr>
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<tr><td rowspan="2" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>COMMITMENT_CONTROL_<br />
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LOCK_LIMIT</p>
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</td>
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<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">*DEFAULT is equivalent to 500,000,000.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">Integer Value</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">The maximum number of records that can be locked to
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a commit transaction initiated after setting the new value. The valid integer
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value is 1–500,000,000.</td>
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</tr>
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<tr><td rowspan="5" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>FORCE_JOIN_ORDER</p>
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</td>
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<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default is set to *NO.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Allow the optimizer to reorder join tables.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*SQL</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">Only force the join order for those queries that use
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the SQL JOIN syntax. This mimics the behavior for the optimizer before V4R4M0.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*PRIMARY nnn</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">Only force the join position for the file listed by
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the numeric value nnn (nnn is optional and will default to 1) into the primary
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position (or dial) for the join. The optimizer will then determine the join
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order for all of the remaining files based upon cost.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Do not allow the query optimizer to reorder
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join tables as part of its optimization process. The join will occur in the
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order in which the tables were specified in the query.</td>
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</tr>
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<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>IGNORE_DERIVED_INDEX</p>
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</td>
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<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is the same as *NO.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">Allow the SQE optimizer to ignore the derived index
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and process the query. The resulting query plan will be created without any
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regard to the existence of the derived index(s). The index types that are
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ignored include: <ul><li>Keyed logical files defined with select or omit criteria and with the
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DYNSLT keyword omitted</li>
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<li>Keyed logical files built over multiple physical file members (V5R2 restriction,
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not a restriction for V5R3)</li>
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<li>Keyed logical files where one or more keys reference an intermediate derivation
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in the DDS. Exceptions to this are: 1. when the intermediate definition is
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defining the field in the DDS so that shows up in the logical's format and
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2. RENAME of a field (these two exceptions do not make the key derived)</li>
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<li>Keyed logical files with K *NONE specified. </li>
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<li>Keyed logical files with Alternate Collating Sequence (ACS) specified</li>
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<li>SQL indexes created when the sort sequence active at the time of creation
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requires a weighting (translation) of the key to occur. This is true when
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any of several non-US language IDs are specified. It also occurs if language
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ID shared weight is specified, even for language US.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">Do not ignore the derived index. If a derived index
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exists, have CQE process the query. </td>
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</tr>
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<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>IGNORE_LIKE_<br />
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REDUNDANT_SHIFTS</p>
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</td>
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<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *OPTIMIZE.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*ALWAYS</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">When processing the SQL LIKE predicate or <span class="cmdname">OPNQRYF</span> command
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%WLDCRD built-in function, redundant shift characters are ignored for DBCS-Open
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operands. Note that this option restricts the query optimizer from using an
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index to perform key row positioning for SQL LIKE or <span class="cmdname">OPNQRYF</span> %WLDCRD
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predicates involving DBCS-Open, DBCS-Either, or DBCS-Only operands.</td>
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</tr>
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<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*OPTIMIZE</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">When processing the SQL LIKE predicate or the <span class="cmdname">OPNQRYF</span> command
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%WLDCRD built-in function, redundant shift characters may or may not be ignored
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for DBCS-Open operands depending on whether an index is used to perform key
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row positioning for these predicates. Note that this option will enable the
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query optimizer to consider key row positioning for SQL LIKE or <span class="cmdname">OPNQRYF</span> %WLDCRD
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predicates involving DBCS-Open, DBCS-Either, or DBCS-Only operands.</td>
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</tr>
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<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>LIMIT_PREDICATE_ <br />
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OPTIMIZATION</p>
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</td>
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<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Do not eliminate the predicates that are
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not simple isolatable predicates (OIF) when doing index optimization. Same
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as *NO.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Do not eliminate the predicates that are
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not simple isolatable predicates (OIF) when doing index optimization.</td>
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</tr>
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<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
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<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Eliminate the predicates that are not simple
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isolatable predicates (OIF) when doing index optimization.</td>
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</tr>
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<tr><td rowspan="2" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>LOB_LOCATOR_THRESHOLD</p>
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</td>
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<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
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<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to 0. This indicates that the
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|
|
database will take no action to free locators.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">Integer Value</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">If the value is 0, then the database will take no action
|
|||
|
|
to free locators. For values 1 through 250,000, on a FETCH request, the database
|
|||
|
|
will compare the active LOB locator count for the job against the threshold
|
|||
|
|
value. If the locator count is greater than or equal to the threshold, the
|
|||
|
|
database will free host server created locators that have been retrieved.
|
|||
|
|
This option applies to all host server jobs (QZDASOINIT) and has no impact
|
|||
|
|
to other jobs.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="4" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>MATERIALIZED_QUERY_ <br />
|
|||
|
|
TABLE_REFRESH_AGE</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to 0.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">0</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">No materialized query tables may be used.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*ANY</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Any tables indicated by the MATERIALIZED_
|
|||
|
|
QUERY_TABLE_USAGE INI parameter may be used.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">timestamp_ duration</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Only tables indicated by MATERIALIZED_ QUERY_TABLE_USAGE
|
|||
|
|
INI option which have a REFRESH TABLE performed within the specified timestamp
|
|||
|
|
duration may be used.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="4" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>MATERIALIZED_QUERY_ <br />
|
|||
|
|
TABLE_USAGE</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *NONE.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NONE</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Materialized query tables may not be used
|
|||
|
|
in query optimization and implementation.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*ALL</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">User-maintained materialized query tables
|
|||
|
|
may be used.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*USER</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">User-maintained materialized query tables
|
|||
|
|
may be used.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>MESSAGES_DEBUG</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default is set to *NO.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">No debug messages are to be displayed.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Issue all debug messages that are generated
|
|||
|
|
for <span class="cmdname">STRDBG</span>.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>NORMALIZE_DATA</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default is set to *NO.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Unicode constants, host variables, parameter
|
|||
|
|
markers, and expressions that combine strings will not be normalized.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Unicode constants, host variables, parameter
|
|||
|
|
markers, and expressions that combine strings will be normalized</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="2" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>OPEN_CURSOR_CLOSE_<br />
|
|||
|
|
COUNT</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">*DEFAULT is equivalent to 0. See Integer Value for details.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">Integer Value</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">OPEN_CURSOR_CLOSE_COUNT is used in conjunction with
|
|||
|
|
OPEN_CURSOR_THRESHOLD to manage the number of open cursors within a job. If
|
|||
|
|
the number of open cursors, which includes open cursors and pseudo-closed
|
|||
|
|
cursors, reaches the value specified by the OPEN_CURSOR_THRESHOLD, pseudo-closed
|
|||
|
|
cursors are hard (fully) closed with the least recently used cursors being
|
|||
|
|
closed first. This value determines the number of cursors to be closed. The
|
|||
|
|
valid values for this parameter are 1 to 65536. The value for this parameter
|
|||
|
|
should be less than or equal to the number in the OPEN_CURSOR_THREHOLD parameter.
|
|||
|
|
This value is ignored if OPEN_CURSOR_THRESHOLD is *DEFAULT. If OPEN_CURSOR_THRESHOLD
|
|||
|
|
is specified and this value is *DEFAULT, the number of cursors closed is equal
|
|||
|
|
to OPEN_CURSOR_THRESHOLD multiplied by 10 percent and rounded up to the next
|
|||
|
|
integer value.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="2" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>OPEN_CURSOR_<br />
|
|||
|
|
THRESHOLD</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">*DEFAULT is equivalent to 0. See Integer Value for details.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">Integer Value</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">OPEN_CURSOR_THRESHOLD is used in conjunction with OPEN_CURSOR_CLOSE_COUNT
|
|||
|
|
to manage the number of open cursors within a job. If the number of open cursors,
|
|||
|
|
which includes open cursors and pseudo-closed cursors, reaches this threshold
|
|||
|
|
value, pseudo-closed cursors are hard (fully) closed with the least recently
|
|||
|
|
used cursors being closed first. The number of cursors to be closed is determined
|
|||
|
|
by OPEN_CURSOR_CLOSE_COUNT. The valid user-entered values for this parameter
|
|||
|
|
are 1 - 65536. Having a value of 0 (default value) indicates that there is
|
|||
|
|
no threshold and hard closes will not be forced on the basis of the number
|
|||
|
|
of open cursors within a job.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>OPTIMIZATION_GOAL</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Optimization goal is determined by the interface (ODBC,
|
|||
|
|
SQL precompiler options, OPTIMIZE FOR nnn ROWS clause).</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*FIRSTIO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">All queries will be optimized with the goal of returning
|
|||
|
|
the first page of output as fast as possible. This goal works well when the
|
|||
|
|
control of the output is controlled by a user who is most likely to cancel
|
|||
|
|
the query after viewing the first page of output data. Queries coded with
|
|||
|
|
an OPTIMIZE FOR nnn ROWS clause will honor the goal specified by the clause.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*ALLIO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">All queries will be optimized with the goal of running
|
|||
|
|
the entire query to completion in the shortest amount of elapsed time. This
|
|||
|
|
is a good option for when the output of a query is being written to a file
|
|||
|
|
or report, or the interface is queuing the output data. Queries coded with
|
|||
|
|
an OPTIMIZE FOR nnn ROWS clause will honor the goal specified by the clause.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="4" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>OPTIMIZE_STATISTIC_<br />
|
|||
|
|
LIMITATION</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The amount of time spent in gathering index
|
|||
|
|
statistics is determined by the query optimizer.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">No index statistics will be gathered by
|
|||
|
|
the query optimizer. Default statistics will be used for optimization. (Use
|
|||
|
|
this option sparingly.)</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*PERCENTAGE integer value</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Specifies the maximum percentage of the index
|
|||
|
|
that will be searched while gathering statistics. Valid values for are 1 to
|
|||
|
|
99.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*MAX_ NUMBER_ OF_RECORDS_ ALLOWED integer
|
|||
|
|
value</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Specifies the largest table size, in number
|
|||
|
|
of rows, for which gathering statistics is allowed. For tables with more rows
|
|||
|
|
than the specified value, the optimizer will not gather statistics and will
|
|||
|
|
use default values.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="8" align="left" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>PARALLEL_DEGREE</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *SYSVAL.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*SYSVAL</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The processing option used is set to the
|
|||
|
|
current value of the system value, QQRYDEGREE.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*IO</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Any number of tasks can be used when the
|
|||
|
|
database query optimizer chooses to use I/O parallel processing for queries.
|
|||
|
|
SMP parallel processing is not allowed.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*OPTIMIZE</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The query optimizer can choose to use any
|
|||
|
|
number of tasks for either I/O or SMP parallel processing to process the query
|
|||
|
|
or database file keyed access path build, rebuild, or maintenance. SMP parallel
|
|||
|
|
processing is used only if the system feature, DB2<sup>®</sup> Symmetric Multiprocessing for <span class="keyword">i5/OS™</span>, is installed. Use of parallel
|
|||
|
|
processing and the number of tasks used is determined with respect to the
|
|||
|
|
number of processors available in the server, this job has a share of the
|
|||
|
|
amount of active memory available in the pool in which the job is run, and
|
|||
|
|
whether the expected elapsed time for the query or database file keyed access
|
|||
|
|
path build or rebuild is limited by CPU processing or I/O resources. The query
|
|||
|
|
optimizer chooses an implementation that minimizes elapsed time based on
|
|||
|
|
the job has a share of the memory in the pool.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*OPTIMIZE xxx</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">This option is very similar to *OPTIMIZE.
|
|||
|
|
The value xxx indicates the ability to specify an integer percentage value
|
|||
|
|
from 1-200. The query optimizer determines the parallel degree for the query
|
|||
|
|
using the same processing as is done for *OPTIMIZE, Once determined, the optimizer
|
|||
|
|
will adjust the actual parallel degree used for the query by the percentage
|
|||
|
|
given. This provides the user the ability to override the parallel degree
|
|||
|
|
used to some extent without having to specify a particular parallel degree
|
|||
|
|
under *NUMBER_OF_TASKS.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*MAX</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The query optimizer chooses to use either
|
|||
|
|
I/O or SMP parallel processing to process the query. SMP parallel processing
|
|||
|
|
will only be used if the system feature, DB2 Symmetric Multiprocessing for <span class="keyword">i5/OS</span>, is installed. The choices
|
|||
|
|
made by the query optimizer are similar to those made for parameter value
|
|||
|
|
*OPTIMIZE except the optimizer assumes that all active memory in the pool
|
|||
|
|
can be used to process the query or database file keyed access path build,
|
|||
|
|
rebuild, or maintenance.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NONE</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">No parallel processing is allowed for database
|
|||
|
|
query processing or database table index build, rebuild, or maintenance.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NUMBER_OF _TASKS nn</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Indicates the maximum number of tasks that can be used
|
|||
|
|
for a single query. The number of tasks will be capped off at either this
|
|||
|
|
value or the number of disk arms associated with the table.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>PARAMETER_MARKER_<br />
|
|||
|
|
CONVERSION</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *YES.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Constants cannot be implemented as parameter
|
|||
|
|
markers.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Constants can be implemented as parameter
|
|||
|
|
markers.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="4" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>QUERY_TIME_LIMIT</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *SYSVAL.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*SYSVAL</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The query time limit for this job will be
|
|||
|
|
obtained from the system value, QQRYTIMLMT.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NOMAX</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">There is no maximum number of estimated elapsed
|
|||
|
|
seconds.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">integer value</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Specifies the maximum value that is checked
|
|||
|
|
against the estimated number of elapsed seconds required to run a query. If
|
|||
|
|
the estimated elapsed seconds is greater than this value, the query is not
|
|||
|
|
started. Valid values range from 0 to 2,147,352,578.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="5" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>REOPTIMIZE_ACCESS_PLAN</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *NO.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Do not force the existing query to be reoptimized. However,
|
|||
|
|
if the optimizer determines that optimization is necessary, the query will
|
|||
|
|
be reoptimized.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Force the existing query to be reoptimized.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*FORCE</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Force the existing query to be reoptimized.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*ONLY_ REQUIRED</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Do not allow the plan to be reoptimized for any subjective
|
|||
|
|
reasons. For these cases, continue to use the existing plan since it is still
|
|||
|
|
a valid workable plan. This may mean that you may not get all of the performance
|
|||
|
|
benefits that a reoptimization plan may derive. Subjective reasons include,
|
|||
|
|
file size changes, new indexes, and so on. Non-subjective reasons include,
|
|||
|
|
deletion of an index used by existing access plan, query file being deleted
|
|||
|
|
and recreated, and so on.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>SQLSTANDARDS_MIXED_<br />
|
|||
|
|
CONSTANT</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *YES.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">SQL IGC constants will be treated as IGC-OPEN constants.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">If the data in the IGC constant only contains shift-out
|
|||
|
|
DBCS-data shift-in, then the constant will be treated as IGC-ONLY, otherwise
|
|||
|
|
it will be treated as IGC-OPEN.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="4" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>SQL_FAST_DELETE_ROW_COUNT</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to 0. <p></p>
|
|||
|
|
Having
|
|||
|
|
a value of 0 indicates that the database manager will choose how many rows
|
|||
|
|
to consider when determining whether fast delete should be used instead
|
|||
|
|
of a traditional delete. When using the default value, the database manager
|
|||
|
|
will most likely use 1000 as a row count. This means that using the INI option
|
|||
|
|
with a value of 1000 result in no operational difference than
|
|||
|
|
using 0 for the option.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NONE</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">This value will force the database manager
|
|||
|
|
to never attempt to fast delete on the rows.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*OPTIMIZE</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">This value is same as using *DEFAULT.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">integer value</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Specifying a value for this option allows
|
|||
|
|
the user to tune the behavior of DELETE. The target table for the DELETE
|
|||
|
|
statement must match or exceed the number of rows specified on the option,
|
|||
|
|
for fast delete to be attempted. A fast delete will not write individual
|
|||
|
|
rows into a journal. The valid values range from 1 to 999,999,999,999,999.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="2" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>SQL_STMT_COMPRESS_MAX</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to 2, which indicates that
|
|||
|
|
the access plan associated with any statement will be removed after a statement
|
|||
|
|
has been compressed twice without being executed. </td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">Integer Value</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The integer value represents the number of times that
|
|||
|
|
a statement is compressed before the access plan is removed to create more
|
|||
|
|
space in the package. Note that executing the SQL statement resets the count
|
|||
|
|
for that statement to 0. The valid Integer values are 1 to 255.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>SQL_SUPPRESS_WARNINGS</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *NO.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Examine the SQLCODE in the SQLCA after execution of
|
|||
|
|
a statement. If the SQLCODE > 0, then alter the SQLCA so that no warning
|
|||
|
|
is returned to the caller. <p></p>
|
|||
|
|
Set the SQLCODE to 0, the SQLSTATE to '00000'
|
|||
|
|
and SQLWARN to ' '.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Specifies that SQL warnings will be returned to the
|
|||
|
|
caller.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>SQL_TRANSLATE_ASCII_<br />
|
|||
|
|
TO_JOB</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *NO.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Translate ASCII SQL statement text to the CCSID of the iSeries™ job.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Translate ASCII SQL statement text to the EBCIDIC CCSID
|
|||
|
|
associated with the ASCII CCSID.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>STAR_JOIN (see note)</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *NO</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The EVI Star Join optimization support is not enabled.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*COST</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Allow query optimization to consider (cost) the usage
|
|||
|
|
of EVI Star Join support. <p></p>
|
|||
|
|
The determination of whether the Distinct
|
|||
|
|
List selection is used will be determined by the optimizer based on how much
|
|||
|
|
benefit can be derived from using that selection.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>STORAGE_LIMIT</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *NOMAX.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*NOMAX</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Never stop a query from running because of
|
|||
|
|
storage concerns.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">Integer Value</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The maximum amount of temporary storage in
|
|||
|
|
megabytes that may be used by a query. This value is checked against the estimated
|
|||
|
|
amount of temporary storage required to run the query as calculated by the
|
|||
|
|
query optimizer. If the estimated amount of temporary storage is greater than
|
|||
|
|
this value, the query is not started. Valid values range from 0 through 2147352578.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>SYSTEM_SQL_STATEMENT_<br />
|
|||
|
|
CACHE</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *YES.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Examine the SQL system-wide statement cache when an
|
|||
|
|
SQL prepare request is processed. If a matching statement already exists in
|
|||
|
|
the cache, use the results of that prepare. This allows the application to
|
|||
|
|
potentially have better performing prepares.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Specifies that the SQL system-wide statement cache should
|
|||
|
|
not be examined when processing an SQL prepare request.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>UDF_TIME_OUT (see note)</p>
|
|||
|
|
</td>
|
|||
|
|
<td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The amount of time to wait is determined
|
|||
|
|
by the database. The default is 30 seconds.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">*MAX</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">The maximum amount of time that the database
|
|||
|
|
will wait for the UDF to finish.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td align="left" valign="middle" width="15.19721577726218%" headers="d0e49 ">integer value</td>
|
|||
|
|
<td align="left" valign="top" width="52.90023201856149%" headers="d0e51 ">Specify the number of seconds that the database
|
|||
|
|
should wait for a UDF to finish. If the value given exceeds the database maximum
|
|||
|
|
wait time, the maximum wait time will be used by the database. Minimum value
|
|||
|
|
is 1 and maximum value is system defined.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td rowspan="3" valign="middle" width="31.90255220417633%" headers="d0e47 "> <p>VARIABLE_LENGTH_<br />
|
|||
|
|
OPTIMIZATION</p>
|
|||
|
|
</td>
|
|||
|
|
<td valign="middle" width="15.19721577726218%" headers="d0e49 ">*DEFAULT</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">The default value is set to *YES.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*YES</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Allow aggressive optimization of variable length columns.
|
|||
|
|
Allows index only access for the column(s). It also allows constant value
|
|||
|
|
substitution when an equal predicate is present against the column(s). As
|
|||
|
|
a consequence, the length of the data returned for the variable length column
|
|||
|
|
may not include any trailing blanks that existed in the original data.</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr><td valign="middle" width="15.19721577726218%" headers="d0e49 ">*NO</td>
|
|||
|
|
<td valign="top" width="52.90023201856149%" headers="d0e51 ">Do not allow aggressive optimization of variable length
|
|||
|
|
columns.</td>
|
|||
|
|
</tr>
|
|||
|
|
</tbody>
|
|||
|
|
</table>
|
|||
|
|
<img src="./deltaend.gif" alt="End of change" /></div>
|
|||
|
|
<div class="section"> <div class="note"><span class="notetitle">Note:</span> Only modifies the environment for the Classic Query Engine.</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
<div class="familylinks">
|
|||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="qryoptf.htm" title="The query options file QAQQINI support provides the ability to dynamically modify or override the environment in which queries are executed through the Change Query Attributes (CHGQRYA) command and the QAQQINI file. The query options file QAQQINI is used to set some attributes used by the database manager.">Control queries dynamically with the query options file QAQQINI</a></div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|