78 lines
4.4 KiB
HTML
78 lines
4.4 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="CPI4328 - Access path of file &3 was used by query" />
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<title>CPI4328 - Access path of file &3 was used by query</title>
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</head>
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<body id="cpi4328"><a name="cpi4328"><!-- --></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">CPI4328 - Access path of file &3 was used by query</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">CPI4328</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 ">Access path of file &3 was used by query.</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 ">Access path for member &5 of file &3 in library &4 was
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used to access records from member &2 of &12 &13 in library &1
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for reason code &9. The reason codes and their meanings follow: <ol><li>Record selection.</li>
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<li>Ordering/grouping criteria.</li>
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<li>Record selection and ordering/grouping criteria.</li>
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</ol>
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<p></p>
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If file &13 in library &1 is a logical file then member &8
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of physical file &6 in library &7 is the actual file being accessed.
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<p></p>
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Index only access was used for this query: &11. <p></p>
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A
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value of *YES for index only access processing indicates that all of the fields
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used for this query can be found within the access path of file &3. A
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value of *NO indicates that index only access could not be performed for this
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access path. <p></p>
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Index only access is generally a performance advantage
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since all of the data can be extracted from the access path and the data space
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does not have to be paged into active memory.</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 ">An access path can only be considered for index only access if all
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of the fields used within the query for this file are also key fields for
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that access path. <p></p>
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Refer to <a href="rzajqdta.htm#rzajqdta">Data access on DB2 UDB for iSeries: data access paths and methods</a> for
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additional tips on index only access.</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 names an existing index that was used by the query.</p>
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</div>
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<div class="section"><p>The reason the index was used is given in the message help.</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>
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</body>
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</html>
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