79 lines
5.6 KiB
HTML
79 lines
5.6 KiB
HTML
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<meta name="abstract" content="Applications that perform many INSERT statements in succession may be improved by using INSERT n ROWS. With this clause, you can insert one or more rows of data from a host structure array into a target table. This array must be an array of structures where the elements of the structure correspond to columns in the target table." />
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<title>Use INSERT n ROWS</title>
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<body id="insertnrows"><a name="insertnrows"><!-- --></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">Use INSERT n ROWS</h1>
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<div><p>Applications that perform many INSERT statements in succession
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may be improved by using INSERT n ROWS. With this clause, you can insert
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one or more rows of data from a host structure array into a target table.
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This array must be an array of structures where the elements of the structure
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correspond to columns in the target table.</p>
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<div class="section"><p>An SQL application that loops over an INSERT...VALUES statement
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(without the n ROWS clause) can be improved by using the INSERT n ROWS statement
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to insert multiple rows into the table. After the application has looped
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to fill the host array with rows, a single INSERT n ROWS statement can be
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run to insert the entire array into the table. The statement runs faster
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because the SQL run-time was only called once and all the data was simultaneously
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inserted into the target table.</p>
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</div>
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<div class="section"><p>In the following table, the program attempted to INSERT 100 rows
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into a table. Note the differences in the number of calls to SQL run-time
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and to the database manager when blocking can be performed.</p>
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</div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="all"><caption>Table 1. Number of Calls Using an INSERT
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Statement</caption><thead align="left"><tr valign="bottom"><th valign="bottom" width="33.33333333333333%" id="d0e55"> </th>
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<th valign="bottom" width="33.33333333333333%" id="d0e56">Database Manager Not Using Blocking</th>
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<th valign="bottom" width="33.33333333333333%" id="d0e58">Database Manager Using Blocking</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e55 ">Single-Row INSERT Statement</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e56 ">100 SQL run-time calls 100 database calls</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e58 ">100 SQL run-time calls 1 database call</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e55 ">Multiple-Row INSERT Statement</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e56 ">1 SQL run-time call 100 database calls</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e58 ">1 SQL run-time call 1 database call</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="progtech.htm" title="By changing the coding of your queries, you can improve their performance.">Programming techniques for database performance</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../db2/rbafzmstbackup.htm">INSERT statement</a></div>
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</div>
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