406 lines
24 KiB
HTML
406 lines
24 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="keywords" content="ALTER SEQUENCE statement, ALTER SEQUENCE,
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SQL statements, in ALTER SEQUENCE statement, sequence-name, built-in data type,
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data type for ALTER SEQUENCE, distinct-type" />
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<title>ALTER SEQUENCE</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="asequence"></a>
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<h2 id="asequence"><a href="rbafzmst02.htm#ToC_755">ALTER SEQUENCE</a></h2><a id="idx1326" name="idx1326"></a><a id="idx1327" name="idx1327"></a>
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<p>The ALTER SEQUENCE statement can be used to change a sequence in any of
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these ways: </p>
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<ul>
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<li>Restarting the sequence</li>
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<li>Changing the increment between future sequence values</li>
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<li>Setting or eliminating the minimum or maximum values</li>
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<li>Changing the number of cached sequence numbers</li>
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<li>Changing the attribute that determines whether the sequence can cycle
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or not</li>
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<li>Changing whether sequence numbers must be generated in order of request</li></ul>
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<a name="wq1056"></a>
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<h3 id="wq1056"><a href="rbafzmst02.htm#ToC_756">Invocation</a></h3>
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<p>This statement can be embedded in an application program or issued interactively.
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It is an executable statement that can be dynamically prepared.</p>
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<a name="wq1057"></a>
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<h3 id="wq1057"><a href="rbafzmst02.htm#ToC_757">Authorization</a></h3>
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<p>The privileges held by the authorization ID of the statement must include
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at least one of the following: </p>
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<ul>
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<li>For the sequence identified in the statement:
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<ul>
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<li>The system authority *EXECUTE on the library containing the sequence</li>
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<li>The ALTER privilege for the sequence</li></ul></li>
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<li>Administrative authority</li></ul>
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<p>The privileges held by the authorization ID of the statement must include
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at least one of the following: </p>
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<ul>
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<li>The following system authorities:
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<ul>
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<li>*USE to the Change Data Area (CHGDTAARA) command</li>
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<li>*USE to the Retrieve Data Area (RTVDTAARA) command</li></ul></li>
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<li>Administrative authority</li></ul>
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<p>The privileges held by the authorization ID of the statement must include
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at least one of the following: </p>
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<ul>
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<li>For the SYSSEQOBJECTS catalog table:
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<ul>
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<li>The UPDATE privilege on the table, and</li>
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<li>The system authority *EXECUTE on library QSYS2</li></ul></li>
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<li>Administrative authority</li></ul>
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<p>If a distinct type is referenced, the privileges held by the authorization ID of
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the statement must include at least one of the following: </p>
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<ul>
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<li>For the distinct type identified in the statement:
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<ul>
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<li>The USAGE privilege on the distinct type, and</li>
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<li>The system authority *EXECUTE on the library containing the distinct type</li></ul></li>
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<li>Administrative authority</li></ul>
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<p>For information on the system authorities corresponding to SQL privileges,
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see <a href="rbafzmstgntseqp.htm#eqtables">Corresponding System Authorities When Checking Privileges to a Sequence</a>, <a href="rbafzmstgnt.htm#eqtablet">Corresponding System Authorities When Checking Privileges to a Table or View</a>, and <a href="rbafzmstgntudtp.htm#eqtabled">Corresponding System Authorities When Checking Privileges to a Distinct Type</a>.</p>
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<a name="wq1058"></a>
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<h3 id="wq1058"><a href="rbafzmst02.htm#ToC_758">Syntax</a></h3>
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<a href="rbafzmstasequence.htm#synasequence"><img src="c.gif" alt="Click to skip syntax diagram" /></a>
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<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn247.htm"
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border="0" /></span><a href="#skipsyn-246"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>>>-ALTER SEQUENCE--<span class="italic">sequence-name</span>-------------------------------->
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.----------------------------------------------.
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V (1) |
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>----+-DATA TYPE--<span class="italic">data-type</span>----------------+------+------------><
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+-RESTART--+------------------------+-+
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| '-WITH--<span class="italic">numeric-constant</span>-' |
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+-INCREMENT BY--<span class="italic">numeric-constant</span>------+
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+-+-NO MINVALUE----------------+------+
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| '-MINVALUE--<span class="italic">numeric-constant</span>-' |
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+-+-NO MAXVALUE----------------+------+
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| '-MAXVALUE--<span class="italic">numeric-constant</span>-' |
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+-+-NO CYCLE-+------------------------+
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| '-CYCLE----' |
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+-+-NO CACHE----------------+---------+
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| '-CACHE--<span class="italic">integer-constant</span>-' |
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'-+-NO ORDER-+------------------------'
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'-ORDER----'
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</pre>
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<a name="skipsyn-246" id="skipsyn-246"></a>
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<a name="wq1059"></a>
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<div class="notelisttitle" id="wq1059">Notes:</div>
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<ol type="1">
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<li>The same clause must not be specified more than once.</li>
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</ol>
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<a name="wq1061"></a>
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<div class="fignone" id="wq1061">
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<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn248.htm"
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border="0" /></span><a href="#skipsyn-247"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>data-type:
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|--+-<span class="italic">built-in-type</span>------+---------------------------------------|
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'-<span class="italic">distinct-type-name</span>-'
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built-in-type:
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|--+-+---SMALLINT---+---------------------------+---------------|
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| +-+-INTEGER-+--+ |
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| | '-INT-----' | |
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| '---BIGINT-----' |
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| .-(5,0)-----------------. |
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'-+-+-DECIMAL-+-+--+-----------------------+-'
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| '-DEC-----' | | .-,0-. |
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'-NUMERIC-----' '-(--<span class="italic">integer</span>--+----+--)-'
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</pre>
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<a name="skipsyn-247" id="skipsyn-247"></a></div>
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<a name="wq1062"></a>
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<div class="fignone" id="wq1062">
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<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn249.htm"
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border="0" /></span><a href="#skipsyn-248"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>built-in-type:
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|--+-+---SMALLINT---+--------------------------------------------------------------------------+--|
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| +-+-INTEGER-+--+ |
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| | '-INT-----' | |
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| '---BIGINT-----' |
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| .-(5,0)------------------------. |
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+-+-+-DECIMAL-+-+--+------------------------------+-----------------------------------------+
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| | '-DEC-----' | | .-,0--------. | |
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| '-NUMERIC-----' '-(--<span class="italic">integer</span>--+-----------+--)-' |
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| '-<span class="italic">, integer</span>-' |
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| .-(--53--)------. |
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+-+-FLOAT--+---------------+-+--------------------------------------------------------------+
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| | '-(--<span class="italic">integer</span>--)-' | |
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| +-REAL---------------------+ |
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| | .-PRECISION-. | |
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| '-DOUBLE--+-----------+----' |
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| .-(--1--)-------. |
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+-+-+-+-CHARACTER-+--+---------------+----------+--+----------------+---------------------+-+
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| | | '-CHAR------' '-(--<span class="italic">integer</span>--)-' | +-FOR BIT DATA---+ | |
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| | '-+-+-CHARACTER-+--VARYING-+--(--<span class="italic">integer</span>--)-' +-FOR SBCS DATA--+ | |
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| | | '-CHAR------' | +-FOR MIXED DATA-+ | |
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| | '-VARCHAR----------------' '-<span class="italic">ccsid-clause</span>---' | |
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| | .-(--1M--)-------------. | |
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| '-----+-+-<span>CHARACTER</span>-+--<span>LARGE OBJECT</span>-+------+----------------------+--+----------------+-' |
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| | '-<span>CHAR</span>------' | '-(--<span class="italic">integer</span>--+---+--)-' +-FOR SBCS DATA--+ |
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| '-<span>CLOB</span>------------------------' +-K-+ +-FOR MIXED DATA-+ |
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| +-M-+ '-<span class="italic">ccsid-clause</span>---' |
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| '-G-' |
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| .-(--1--)-------. |
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+-+---GRAPHIC----+---------------+-------+--+--------------+--------------------------------+
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| | '-(--<span class="italic">integer</span>--)-' | '-<span class="italic">ccsid-clause</span>-' |
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| +-+-GRAPHIC VARYING-+--(--<span class="italic">integer</span>--)---+ |
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| | '-VARGRAPHIC------' | |
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| | .-(--1M--)-------------. | |
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| '---DBCLOB----+----------------------+-' |
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| '-(--<span class="italic">integer</span>--+---+--)-' |
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| +-K-+ |
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| +-M-+ |
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| '-G-' |
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| .-(--1--)-------. |
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+-+-+-BINARY--+---------------+---------+-----------------+---------------------------------+
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| | | '-(--<span class="italic">integer</span>--)-' | | |
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| | '-+-BINARY VARYING-+--(--<span class="italic">integer</span>--)-' | |
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| | '-VARBINARY------' | |
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| | .-(--1M--)-------------. | |
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| '---+-BLOB----------------+----+----------------------+-' |
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| '-BINARY LARGE OBJECT-' '-(--<span class="italic">integer</span>--+---+--)-' |
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| +-K-+ |
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| +-M-+ |
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| '-G-' |
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+-+-DATE-------------------+----------------------------------------------------------------+
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| | .-(--0--)-. | |
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| +-TIME--+---------+------+ |
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| | .-(--6--)-. | |
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| '-TIMESTAMP--+---------+-' |
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| .-(--200--)-----. |
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+---DATALINK--+---------------+--+--------------+-------------------------------------------+
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| '-(--<span class="italic">integer</span>--)-' '-<span class="italic">ccsid-clause</span>-' |
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'---ROWID-----------------------------------------------------------------------------------'
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ccsid-clause:
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.-NOT NORMALIZED-.
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|--CCSID--<span class="italic">integer</span>--+----------------+---------------------------|
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'-NORMALIZED-----'
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</pre>
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<a name="skipsyn-248" id="skipsyn-248"></a></div>
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<a name="synasequence"></a>
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<h3 id="synasequence"><a href="rbafzmst02.htm#ToC_759">Description</a></h3>
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<dl class="parml">
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<dt class="bold"><var class="pv">sequence-name</var></dt>
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<dd>Identifies the sequence to be altered.<a id="idx1328" name="idx1328"></a> The name, including
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the implicit or explicit qualifier, must identify a sequence or data area
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that already exists at the current server.
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</dd>
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<dt class="bold"><span class="bold">DATA TYPE</span> <var class="pv">data-type</var></dt>
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<dd>Specifies the new data type to be used for the sequence value. The data
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type can be any exact numeric type (SMALLINT, INTEGER, BIGINT, DECIMAL, or
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NUMERIC) with a scale of zero, or a user-defined distinct type for which the
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source type is an exact numeric type with a scale of zero.
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<p>Each of the existing
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START WITH, INCREMENT BY, MINVALUE, and MAXVALUE attributes that are not changed
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by the ALTER SEQUENCE statement must contain a value that could be assigned
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to a column of the data type associated with the new data type.</p>
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</dd>
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<dt class="bold"><var class="pv">built-in-type</var> </dt><a id="idx1329" name="idx1329"></a>
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<dd>Specifies the new built-in data type used as the basis for the internal
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representation of the sequence. If the data type is DECIMAL or NUMERIC, the
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precision must be less than or equal to 63 and the scale must be 0. See <a href="rbafzmsthctabl.htm#hctabl">CREATE TABLE</a> for a more complete description of each built-in data type.
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<p>For portability of applications across platforms, use DECIMAL instead of a
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NUMERIC data type.</p>
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</dd>
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<dt class="bold"><var class="pv">distinct-type-name</var> </dt><a id="idx1330" name="idx1330"></a>
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<dd>Specifies that the new data type of the sequence is a distinct type (a user-defined
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data type). If the source type is DECIMAL or NUMERIC, the precision of the
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sequence is the precision of the source type of the distinct type. The precision
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of the source type must be less than or equal to 63 and the scale must be
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0. If a distinct type name is specified without a schema name, the distinct
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type name is resolved by searching the schemas on the SQL path.
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</dd>
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<dt class="bold"><span class="bold">RESTART </span></dt>
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<dd>Restarts the sequence. If <var class="pv">numeric-constant</var> is not specified,
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the sequence is restarted at the value specified implicitly or explicitly
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as the starting value on the CREATE SEQUENCE statement that originally created
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the sequence.
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<dl class="parml">
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<dt class="bold"><span class="bold">WITH </span><var class="pv">numeric-constant</var></dt>
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<dd>Restarts the sequence with the specified value. This value can be any
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positive or negative value that does not exceed the value of a numeric constant
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that could be assigned to a column of the data type associated with the sequence,
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and without non-zero digits to the right of the decimal point
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</dd>
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</dl>After restarting a sequence or changing the sequence to allow cycling,
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it is possible for sequence numbers to be duplicate values of ones generated
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by the sequence previously.
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</dd>
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<dt class="bold"><span class="bold">INCREMENT BY </span><var class="pv">numeric-constant</var></dt>
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<dd>Specifies the interval between consecutive values of the sequence. The
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value must not exceed the value of a large integer constant without any non-zero
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digits existing to the right of the decimal point. The value must be assignable
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to the sequence.
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<p>If the value is zero or positive, the sequence of values
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for the sequence ascends. If the value is negative, the sequence of values
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descends.</p>
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</dd>
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<dt class="bold"><span class="bold">NO MINVALUE </span><span> or </span><span class="bold">MINVALUE </span></dt>
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<dd>Specifies the minimum value at which a descending sequence either cycles
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or stops generating values, or an ascending sequence cycles to after reaching
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the maximum value.
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<dl class="parml">
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<dt class="bold"><span class="bold">NO MINVALUE </span></dt>
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<dd>For an ascending sequence, the value is the original starting value.
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For a descending sequence, the value is the minimum value of the data type
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(and precision, if DECIMAL or NUMERIC) associated with the sequence.
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</dd>
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<dt class="bold"><span class="bold">MINVALUE </span><var class="pv">numeric-constant</var></dt>
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<dd>Specifies the numeric constant that is the minimum value that is generated
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for this sequence. This value can be any positive or negative value that could
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be assigned to a column of the data type associated with the sequence and
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without non-zero digits to the right of the decimal point. The value must
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be less than or equal to the maximum value.
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</dd>
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</dl>
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</dd>
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<dt class="bold"><span class="bold">NO MAXVALUE </span><span> or </span><span class="bold">MAXVALUE </span></dt>
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<dd>Specifies the maximum value at which an ascending sequence either cycles
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or stops generating values, or a descending sequence cycles to after reaching
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the minimum value.
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<dl class="parml">
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<dt class="bold"><span class="bold">NO MAXVALUE </span></dt>
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<dd>For an ascending sequence, the value is the maximum value of the data
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type (and precision, if DECIMAL or NUMERIC) associated with the sequence.
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For a descending sequence, the value is the original starting value.
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</dd>
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<dt class="bold"><span class="bold">MAXVALUE </span> <var class="pv">numeric-constant</var></dt>
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<dd>Specifies the numeric constant that is the maximum value that is generated
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for this sequence. This value can be any positive or negative value that could
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be assigned to a column of the data type associated with the sequence and
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without non-zero digits to the right of the decimal point. The value must
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be greater than or equal to the minimum value.
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</dd>
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</dl>
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</dd>
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<dt class="bold"><span class="bold">CYCLE</span> or <span class="bold">NO CYCLE</span></dt>
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<dd>Specifies whether this sequence should continue to generate values after
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reaching either the maximum or minimum value of the sequence.
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<dl class="parml">
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<dt class="bold"><span class="bold">CYCLE</span></dt>
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<dd>Specifies that values continue to be generated for this sequence
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after the maximum or minimum value has been reached. If this keyword is used,
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after an ascending sequence reaches the maximum value of the sequence, it
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generates its minimum value. After a descending sequence reaches its minimum
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value of the sequence, it generates its maximum value. The maximum and minimum
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values for the sequence determine the range that is used for cycling.
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<p>When
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CYCLE is in effect, duplicate values can be generated for a sequence by the database manager.</p>
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</dd>
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<dt class="bold"><span class="bold">NO CYCLE</span></dt>
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<dd>Specifies that values will not be generated for the sequence once the
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maximum or minimum value for the sequence has been reached.
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</dd>
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</dl>
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</dd>
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<dt class="bold"><span class="bold">CACHE</span> or <span class="bold">NO CACHE</span></dt>
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<dd>Specifies whether to keep some preallocated values in memory. Preallocating
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and storing values in the cache improves the performance of the NEXT VALUE
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sequence expression.
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<dl class="parml">
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<dt class="bold"><span class="bold">CACHE</span> <var class="pv">integer-constant</var></dt>
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<dd>Specifies the maximum number of sequence values that are preallocated
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and kept in memory. Preallocating and storing values in the cache reduces
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synchronous I/O when values are generated for the sequence.
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<p>In certain
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situations, such as system failure, all cached sequence values that have not
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been used in committed statements are lost, and thus, will never be used.
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The value specified for the CACHE option is the maximum number of sequence
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values that could be lost in these situations.</p>
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<p>The minimum value is
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2.</p>
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</dd>
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<dt class="bold"><span class="bold">NO CACHE</span> </dt>
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<dd>Specifies that values of the sequence are not to be preallocated. It
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ensures that there is not a loss of values in situations, such as system failure.
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When this option is specified, the values of the sequence are not stored in
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the cache. In this case, every request for a new value for the sequence results
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in synchronous I/O.
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</dd>
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</dl>
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</dd>
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<dt class="bold"><span class="bold">NO ORDER</span> or <span class="bold">ORDER</span></dt>
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<dd>Specifies whether the identity values must be generated in order of
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request.
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<dl class="parml">
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<dt class="bold"><span class="bold">NO ORDER</span></dt>
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<dd>Specifies that the values do not need to be generated in order of request.
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</dd>
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<dt class="bold"><span class="bold">ORDER</span></dt>
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<dd>Specifies that the values are generated in order of request.
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If ORDER is specified, the performance of the NEXT VALUE sequence expression
|
|
will be worse than if NO ORDER is specified.
|
|
</dd>
|
|
</dl>
|
|
</dd>
|
|
</dl>
|
|
<a name="wq1063"></a>
|
|
<h3 id="wq1063"><a href="rbafzmst02.htm#ToC_760">Notes</a></h3>
|
|
<p><span class="bold">Altering a sequence:</span> </p>
|
|
<ul>
|
|
<li>Only future sequence numbers are affected by the ALTER SEQUENCE statement.</li>
|
|
<li>All the cached values are lost when a sequence is altered.</li>
|
|
<li>After restarting a sequence or changing it to cycle, it is possible that
|
|
a generated value will duplicate a value previously generated for that sequence.</li></ul>
|
|
<p><span class="bold">Syntax alternatives:</span> The following keywords are synonyms
|
|
supported for compatibility to prior releases of other DB2® UDB products.
|
|
These keywords are non-standard and should not be used:</p>
|
|
<ul>
|
|
<li>The keywords NOMINVALUE, NOMAXVALUE, NOCYCLE, NOCACHE, and NOORDER can
|
|
be used as synonyms for NO MINVALUE, NO MAXVALUE, NO CYCLE, NO CACHE, and
|
|
NO ORDER.</li></ul>
|
|
<a name="wq1064"></a>
|
|
<h3 id="wq1064"><a href="rbafzmst02.htm#ToC_761">Examples</a></h3>
|
|
<p>A possible reason for specifying RESTART without a numeric value would
|
|
be to reset the sequence to the START WITH value. In this example, the goal
|
|
is to generate the numbers from 1 up to the number of rows in a table and
|
|
then inserting the numbers into a column added to the table using temporary
|
|
tables. </p>
|
|
<pre class="xmp"> <span class="bold">ALTER SEQUENCE</span> ORG_SEQ
|
|
<span class="bold">RESTART</span>
|
|
|
|
<span class="bold">DECLARE GLOBAL TEMPORARY TABLE</span> TEMP_ORG <span class="bold">AS</span>
|
|
<span class="bold">(SELECT NEXT VALUE FOR</span> ORG_SEQ, ORG.*
|
|
<span class="bold">FROM</span> ORG<span class="bold">) WITH DATA</span></pre>
|
|
<p>Another use would be to get results back where all the resulting rows are
|
|
numbered:</p>
|
|
<pre class="xmp"> <span class="bold">ALTER SEQUENCE</span> ORG_SEQ
|
|
<span class="bold">RESTART</span>
|
|
|
|
<span class="bold">SELECT NEXT VALUE FOR</span> ORG_SEQ, ORG.*
|
|
<span class="bold">FROM</span> ORG</pre>
|
|
<hr /><br />
|
|
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