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129 lines
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<title>CPI4323 - The query access plan has been rebuilt</title>
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<body id="cpi4323"><a name="cpi4323"><!-- --></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">CPI4323 - The query access plan has been rebuilt</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="d0e25">CPI4323</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="d0e25 ">Message Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e25 ">The query access plan has been rebuilt.</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e25 ">Cause Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e25 ">The access plan was rebuilt for reason code &13. The reason codes
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and their meanings follow: <ol><li>A file or member is not the same object as the one referred to in the
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access plan. Some reasons include the object being re-created, restored, or
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overridden to a new object.</li>
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<li>Access plan was using a reusable Open Data Path (ODP), and the optimizer
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chose to use a non-reusable ODP.</li>
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<li>Access plan was using a non-reusable Open Data Path (ODP) and the optimizer
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chose to use a reusable ODP</li>
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<li>The number of records in member &3 of file &1 in library &2
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has changed by more than 10%.</li>
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<li>A new access path exists over member &6 of file &4 in library &5.</li>
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<li>An access path over member &9 of file &7 in library &8 that
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was used for this access plan no longer exists or is no longer valid.</li>
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<li> The query access plan had to be rebuilt because of system programming
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changes. </li>
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<li>The CCSID (Coded Character Set Identifier) of the current job is different
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than the CCSID used in the access plan</li>
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<li>The value of one of the following is different in the current job: date
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format, date separator, time format, or time separator.</li>
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<li>The sort sequence table specified has changed.</li>
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<li>The number of active processors or the size or paging option of the storage
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pool has changed.</li>
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<li>The system feature DB2<sup>®</sup> UDB Symmetric Multiprocessing has either been installed
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or removed.</li>
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<li>The value of the degree query attribute has changed either by the <span class="cmdname">CHGSYSVAL</span> or <span class="cmdname">CHGQRYA</span> CL
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commands or with the query options file &15 in library &16.</li>
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<li>A view is either being opened by a high level language open, or is being
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materialized.</li>
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<li>A sequence object or user-defined type or function is not the same object
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as the one referred to in the access plan; or, the SQL path used to generate
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the access plan is different than the current SQL path.</li>
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<li>Query attributes have been specified from the query options file &15
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in library &16.</li>
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<li>The access plan was generated with a commitment control level that is
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different in the current job.</li>
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<li>The access plan was generated with a different static cursor answer set
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size.</li>
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<li>This is the first run of the query since a prepare or compile.</li>
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<li>or greater. View the second level message text of the next message issued
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(CPI4351) for an explanation of these reason codes. </li>
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</ol>
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If the reason code is 4, 5, 6, 20, or 21 and the file specified in the
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reason code explanation is a logical file, then member &12 of physical
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file &10 in library &11 is the file with the specified change.</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="26.02040816326531%" headers="d0e25 ">Recovery Text:</td>
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<td valign="middle" width="73.9795918367347%" headers="d0e25 ">Excessive rebuilds should be avoided and may indicate an application
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design problem.</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"><p>This message can be sent for a variety of reasons. The specific
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reason is provided in the message help.</p>
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</div>
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<div class="section"><p>Most of the time, this message is sent when the queried table
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environment has changed, making the current access plan obsolete. An example
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of the table environment changing is when an index required by the query no
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longer exists on the server.</p>
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</div>
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<div class="section"><p>An access plan contains the instructions for how a query is to
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be run and lists the indexes for running the query. If a needed index is no
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longer available, the query is again optimized, and a new access plan is created,
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replacing the old one.</p>
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</div>
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<div class="section"><p>The process of again optimizing the query and building a new access
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plan at runtime is a function of <span class="keyword">DB2 UDB for iSeries™</span>.
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It allows a query to be run as efficiently as possible, using the most current
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state of the database without user intervention.</p>
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</div>
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<div class="section"><p>The infrequent appearance of this message is not a cause for action.
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For example, this message will be sent when an SQL package is run the first
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time after a restore, or anytime the optimizer detects that a change has occurred
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(such as a new index was created), that warrants an implicit rebuild. However,
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excessive rebuilds should be avoided because extra query processing will occur.
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Excessive rebuilds may indicate a possible application design problem or inefficient
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database management practices.</p>
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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 class="relref"><strong>Related reference</strong><br />
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<div><a href="cpi4351.htm">CPI4351 - Additional reason codes for query access plan has been rebuilt.</a></div>
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<div><a href="cpi434c.htm">CPI434C - The query access plan was not rebuilt</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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