76 lines
4.4 KiB
HTML
76 lines
4.4 KiB
HTML
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<meta name="DC.Title" content="CPI4329 - Arrival sequence access was used for &12 &13" />
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<title>CPI4329 - Arrival sequence access was used for &12 &13</title>
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</head>
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<body id="cpi4329"><a name="cpi4329"><!-- --></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">CPI4329 - Arrival sequence access was used for &12 &13</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">CPI4329</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 ">Arrival sequence access was used for &12 &13.</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 ">Arrival sequence access was used to select records from member &2
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of file &13 in library &1. <p></p>
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If file &13 in library &1
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is a logical file then member &8 of physical file &6 in library &7
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is the actual file from which records are being selected. <p></p>
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A
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file name starting with *N or *QUERY for the file indicates it is a temporary
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file.</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 use of an access path may improve the performance of the query
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if record selection is specified. <p></p>
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If an access path does not
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exist, you may want to create one whose left-most key fields match fields
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in the record selection. Matching more key fields in the access path with
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fields in the record selection will result in improved performance.
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<p></p>
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Generally, to force the use of an existing access path, specify order
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by fields that match the left-most key fields of that access path. <p></p>
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For
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more information refer to <a href="rzajqdta.htm#rzajqdta">Data access on DB2 UDB for iSeries: data access paths and methods</a>.</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>If an index does not exist, you may want to create
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one whose key column matches one of the columns in the row selection. You
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should only create an index if the row selection (WHERE clause) selects 20%
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or fewer rows in the table. To force the use of an existing index, change
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the ORDER BY clause of the query to specify the first key column of the index,
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or ensure that the query is running under a first I/O environment.</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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