91 lines
5.3 KiB
HTML
91 lines
5.3 KiB
HTML
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<title>CPI4350 - Materialized query tables were considered for optimization</title>
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</head>
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<body id="cpi4349"><a name="cpi4349"><!-- --></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">CPI4350 - Materialized query tables were considered for optimization</h1>
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<div>
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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" align="center" valign="middle" id="d0e16">CPI4350</th>
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</tr>
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</thead>
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<tbody><tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e16 ">Message Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e16 ">Materialized query tables were considered for optimization.</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e16 ">Cause Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e16 ">The query optimizer considered usage of materialized query tables for
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this query. Following each materialized query table name in the list
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is a reason code which explains why the materialized query table was not used.
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A reason code of 0 indicates that the materialized query table was used to
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implement the query. <p>The reason codes and their meanings follow: </p>
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<ol><li>The cost to use the materialized query table, as determined by the optimizer,
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was higher than the cost associated with the chosen implementation. </li>
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<li>The join specified in the materialized query was not compatible with the
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query.</li>
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<li>The materialized query table had predicates that were not matched in the
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query.</li>
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<li>The grouping or distinct specified in the materialized query table is
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not compatible with the grouping or distinct specified in the query.</li>
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<li>The query specified columns that were not in the select-list of the materialized
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query table. </li>
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<li>The materialized query table query contains functionality that is not
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supported by the query optimizer. </li>
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<li>The materialized query table specified the DISABLE QUERY OPTIMIZATION
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clause.</li>
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<li>The ordering specified in the materialized query table is not compatible
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with the ordering specified in the query. </li>
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<li>The query contains functionality that is not supported by the materialized
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query table matching algorithm.</li>
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<li>Materialized query tables may not be used for this query. </li>
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<li>The refresh age of this materialized query table exceeds the duration
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specified by the MATERIALIZED_QUERY_TABLE_REFRESH_AGE QAQQINI option. </li>
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<li>The commit level of the materialized query table is lower than the commit
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level specified for the query.</li>
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<li>The FETCH FOR FIRST n ROWS clause of the materialized query table is not
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compatible with the query. </li>
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<li>The QAQQINI options used to create the materialized query table are not
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compatible with the QAQQINI options used to run this query. </li>
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<li>The materialized query table is not usable.</li>
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<li>The UNION specified in the materialized query table is not compatible
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with the query.</li>
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<li>The constants specified in the materialized query table are not compatible
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with host variable values specified in the query.</li>
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</ol>
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</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e16 ">Recovery Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e16 ">The user may want to delete any materialized query tables that are
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no longer needed.</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>
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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="pimes.htm" title="You can evaluate the structure and performance of the given SQL statements in a program using informational messages put in the job log by the database manager.">Query optimization performance information messages</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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