80 lines
4.6 KiB
HTML
80 lines
4.6 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Modification of existing partitioned tables" />
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<meta name="abstract" content="You can make several changes to your partitioned table by using the clauses of the ALTER TABLE statement." />
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<meta name="description" content="You can make several changes to your partitioned table by using the clauses of the ALTER TABLE statement." />
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<meta name="DC.Relation" scheme="URI" content="altertype.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Modification of existing partitioned tables</title>
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</head>
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<body id="existingpt"><a name="existingpt"><!-- --></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">Modification of existing partitioned tables</h1>
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<div><p>You can make several changes to your partitioned table by using
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the clauses of the <samp class="codeph">ALTER TABLE</samp> statement.</p>
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<p>These clauses are as follows:</p>
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<ul><li><samp class="codeph">ADD PARTITION</samp> <div class="p">This clause adds one or more new hash
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partitions or a range partition to an existing partitioned table. Make sure
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that the parameters you specify do not violate the following rules; otherwise,
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errors occur. <ul><li>Do not use the <samp class="codeph">ADD PARTITION</samp> clause for nonpartitioned
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tables.</li>
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<li>When adding hash partitions, the number of partitions being added must
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be specified as a positive integer.</li>
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<li>If you supply a name or integer to identify the partition, ensure that
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it is not already in use by another partition.</li>
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<li>When adding range partitions, the specified ranges must not overlap the
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ranges of any existing partitions.</li>
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</ul>
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</div>
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<p>For example, to alter the table PAYROLL in library
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PRODLIB with partition key EMPNUM to have four additional partitions, use
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the following code:</p>
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<pre>ALTER TABLE PRODLIB.PAYROLL
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ADD PARTITION 4 HASH PARTITIONS</pre>
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</li>
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<li><samp class="codeph">ALTER PARTITION</samp> <p>This clause alters the range for the
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identified range partition. Ensure that the following conditions are met:</p>
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<ul><li>The identified partition must exist in the table.</li>
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<li>The specified ranges must not overlap the ranges of any existing partitions.</li>
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<li>All existing rows of the partitioned table must fall within the new ranges
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specified on the ALTER TABLE statement.</li>
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</ul>
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</li>
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<li><samp class="codeph">DROP PARTITION</samp> <p>This clause drops a partition
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of a partitioned table. If the specified table is not a partitioned table,
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an error is returned. If the last remaining partition of a partitioned table
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is specified, an error is returned.</p>
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</li>
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</ul>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="altertype.htm">Restrictions when altering a column's data type</a></strong><br />
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When altering a column's data type, and that column is part of a partitioning key, there are some restrictions on the target data type.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="alterpt.htm" title="You can change existing nonpartitioned tables to partitioned tables, change the attributes of existing partitioned tables, or change partitioned table to nonpartitioned tables.">Modification of existing tables</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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