137 lines
8.7 KiB
HTML
137 lines
8.7 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 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="DC.Type" content="concept" />
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<meta name="DC.Title" content="Commit notify object" />
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<meta name="abstract" content="A notify object is a message queue, data area, or database file that contains information identifying the last successful transaction completed for a particular commitment definition if that commitment definition did not end normally." />
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<meta name="description" content="A notify object is a message queue, data area, or database file that contains information identifying the last successful transaction completed for a particular commitment definition if that commitment definition did not end normally." />
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<meta name="DC.Relation" scheme="URI" content="rzakjstartcommit.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakjcommitbatch.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakjusenotify.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Identifier" content="rzakjnotify" />
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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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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Commit notify object</title>
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</head>
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<body id="rzakjnotify"><a name="rzakjnotify"><!-- --></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">Commit notify object</h1>
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<div><p>A <dfn class="term">notify object</dfn> is a message queue, data area, or
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database file that contains information identifying the last successful transaction
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completed for a particular commitment definition if that commitment definition
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did not end normally.</p>
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<p>The information used to identify the last successful transaction for a
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commitment definition is given by the <dfn class="term">commit identification</dfn> that
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associates a commit operation with a specific set of committable resource
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changes.</p>
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<p>The commit identification of the last successful transaction for a commitment
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definition is placed in the notify object only if the commitment definition
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does not end normally. This information can be used to help determine where
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processing for an application ended so that the application can be started
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again.</p>
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<p>For independent disk pools, the notify object must reside on the same independent
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disk pool or independent disk pool group as the commitment definition. If
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you move the commitment definition to another independent disk pool or independent
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disk pool group, the notify object must also reside on that other independent
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disk pool or independent disk pool group. The notify object on the other independent
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disk pool or independent disk pool group is updated if the commitment definition
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ends abnormally. If the notify object is not found on the other independent
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disk pool or independent disk pool group, the update fails with message CPF8358.</p>
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<p>If journaled resources participate in the current transaction and a commit
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operation is performed with a commit identification, the commit identification
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is placed in the commit journal entry (journal code and entry type of C CM)
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that identifies that particular transaction as being committed. A commit journal
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entry containing the commit identification is sent to each journal associated
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with resources that participated in the transaction.</p>
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<p>The following table shows how you specify the commit identification and
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its maximum size. If the commit identification exceeds its maximum size, it
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is truncated when it is written to the notify object.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e41">Language</th>
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<th valign="top" id="d0e43">Operation</th>
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<th valign="top" id="d0e45">Maximum characters in commit identification</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e41 ">CL</td>
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<td valign="top" headers="d0e43 ">COMMIT command</td>
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<td valign="top" headers="d0e45 ">3000 <sup>1</sup></td>
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</tr>
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<tr><td valign="top" headers="d0e41 ">ILE RPG*</td>
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<td valign="top" headers="d0e43 ">COMIT operation code</td>
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<td valign="top" headers="d0e45 ">4000 <sup>1</sup></td>
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</tr>
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<tr><td valign="top" headers="d0e41 ">PLI.</td>
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<td valign="top" headers="d0e43 ">PLICOMMIT subroutine</td>
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<td valign="top" headers="d0e45 ">4000 <sup>1</sup></td>
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</tr>
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<tr><td valign="top" headers="d0e41 ">ILE C*</td>
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<td valign="top" headers="d0e43 ">_Rcommit function</td>
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<td valign="top" headers="d0e45 ">4000 <sup>1</sup></td>
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</tr>
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<tr><td valign="top" headers="d0e41 ">ILE COBOL*</td>
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<td valign="top" headers="d0e43 ">COMMIT verb</td>
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<td valign="top" headers="d0e45 ">Not supported</td>
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</tr>
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<tr><td valign="top" headers="d0e41 ">SQL</td>
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<td valign="top" headers="d0e43 ">COMMIT statement</td>
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<td valign="top" headers="d0e45 ">Not supported</td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e41 d0e43 d0e45 "><div class="note"><span class="notetitle">Note:</span> <sup>1</sup>If the notify object
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is a data area, the maximum size is 2000 characters.</div>
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</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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<p>When a notify object is updated with the commit identification, it is updated
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as follows:</p>
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<dl><dt class="dlterm">Database file</dt>
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<dd>If a database file is used as the notify object, the commit identification
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is added to the end of the file. Any existing records will be left in the
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file. Because several users or jobs can be changing records at the same time,
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each commit identification in the file contains unique information to associate
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the data with the job and commitment definition that failed. The file that
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serves can be journaled</dd>
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<dt class="dlterm">Data area</dt>
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<dd>If a data area is used as the notify object, the entire content of the
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data area is replaced when the commit identification is placed in the data
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area. If more than one user or job is using the same program, only the commit
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identification from the last commitment definition that did not end normally
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will be in the data area. Consequently, a single data area notify object might
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not produce the correct information for starting the application programs
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again. To solve this problem, use a separate data area for each commitment
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definition for each workstation user or job.</dd>
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<dt class="dlterm">Message queue</dt>
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<dd>If a message queue is used as a notify object, message CPI8399 is sent
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to the message queue. The commit identification is placed in the second-level
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text for message CPI8399. As with using a database file for the notify object,
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the contents of each commit identification uniquely identify a particular
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commitment definition for a job so that an application program can be started
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again.</dd>
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</dl>
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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="rzakjstartcommit.htm" title="To start commitment control, use the Start Commitment Control (STRCMTCTL) Command.">Start commitment control</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakjcommitbatch.htm" title="Batch applications might or might not need commitment control. In some cases, a batch application can perform a single function of reading an input file and updating a master file. However, you can use commitment control for this type of application if it is important to start it again after an abnormal end.">Commitment control for batch applications</a></div>
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<div><a href="rzakjusenotify.htm" title="When a program is started after an abnormal end, it can look for an entry in the notify object. If the entry exists, the program can start a transaction again. After the transaction has been started again, the notify object is cleared by the program to prevent it from starting the same transaction yet another time.">Example: Use a notify object to start an application</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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