247 lines
14 KiB
HTML
247 lines
14 KiB
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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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Implicit commit and rollback operations" />
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<meta name="abstract" content="In some instances a commit or rollback operation is initiated by the system for a commitment definition. These types of commit and rollback operations are known as implicit commit and rollback requests." />
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<meta name="description" content="In some instances a commit or rollback operation is initiated by the system for a commitment definition. These types of commit and rollback operations are known as implicit commit and rollback requests." />
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<meta name="DC.Relation" scheme="URI" content="rzakjsysteminit.htm" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Implicit commit and rollback operations</title>
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</head>
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<body id="rzakjimprollcmit"><a name="rzakjimprollcmit"><!-- --></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">Implicit commit and rollback operations</h1>
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<div><p>In some instances a commit or rollback operation is initiated by
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the system for a commitment definition. These types of commit and rollback
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operations are known as <em>implicit commit and rollback requests</em>. </p>
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<p>Typically, a commit or rollback operation is initiated
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from an application program using one of the available programming languages
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that supports commitment control. These types of commit and rollback operations
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are known as <em>explicit commit and rollback requests</em>.</p>
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<p>The following two tables show what the system does when
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certain events occur related to a commitment definition that has pending changes.
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A commitment definition has pending changes if any of the following conditions
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is true:</p>
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<ul><li>Any committable resource has been updated.</li>
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<li>A database file opened under commitment control has been read because
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reading a file changes the file position.</li>
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<li>The commitment definition has an API resource. Because changes to API
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resources are done by a user program, the system must assume that all API
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resources have pending changes.</li>
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</ul>
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<p>The C CM (commit operation) journal entry and C RB (rollback operation)
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journal entry indicate whether the operation was explicit or implicit.</p>
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<p>The following table shows the actions the system takes
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when a job ends, either normally or abnormally, based on the following situations:</p>
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<ul><li>The state of the transaction.</li>
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<li>The action-if-end job value for the commitment definition.</li>
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<li>Whether an API resource is the last agent.</li>
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</ul>
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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" width="20%" id="d0e54">State</th>
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<th valign="top" width="20%" id="d0e56">Last agent API</th>
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<th valign="top" width="20%" id="d0e58">Action if Endjob<sup>1</sup> option</th>
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<th valign="top" width="40%" id="d0e63">Commit or rollback operation</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="20%" headers="d0e54 ">RST</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">N/A</td>
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<td valign="top" width="40%" headers="d0e63 ">If the commitment definition is not associated with an X/Open global
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transaction, an implicit rollback is performed. <p>If the
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commitment definition is associated with an X/Open global transaction, the
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following events occur:</p>
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<ul><li>If the transaction branch state is not Active (S1), no action is performed
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and the transaction branch is left in the same state.</li>
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<li>If the transaction branch state is Active (S1), an implicit rollback is
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performed.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e54 ">PIP</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">N/A</td>
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<td valign="top" width="40%" headers="d0e63 ">If the commitment definition is not associated with an X/Open global
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transaction, an implicit rollback is performed. <p>If the commitment definition
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is associated with an X/Open global transaction, the transaction branch is
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in the Idle (S2) state, and it is left in the Idle (S2) state.</p>
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</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e54 ">PRP</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">WAIT</td>
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<td valign="top" width="40%" headers="d0e63 ">If the commitment definition is not associated with an X/Open<sup>2</sup> global
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transaction, the following occurs: <ul><li>Resynchronization is started to receive the decision from the initiator
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of the commit operation.</li>
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<li>The returned decision to commit or rollback is performed. It is considered
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an explicit operation.</li>
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</ul>
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</td>
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</tr>
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<tr><td rowspan="2" valign="top" width="20%" headers="d0e54 ">PRP</td>
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<td rowspan="2" valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">C</td>
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<td valign="top" width="40%" headers="d0e63 ">If the commitment definition is not associated with an X/Open<sup>2</sup> global
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transaction, an implicit commit operation is performed.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e58 ">R</td>
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<td valign="top" width="40%" headers="d0e63 ">If the commitment definition is not associated with an X/Open global
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transaction, an implicit rollback operation is performed. <p>If the commitment
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definition is associated with an X/Open global transaction, the following
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occurs:</p>
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<ul><li>If the job that started the transaction ends, the transaction is left
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in a prepared state until the XA TM either commits it or rolls it back. The
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XA transaction branch state will be left at Prepared (S3) in this case.</li>
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<li>If the SQL server job that the transaction's work is being routed to is
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ended, a forced rollback is implicitly performed. The XA transaction branch
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state will be changed to Heuristically Completed (S5) in this case.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e54 ">CIP</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">N/A</td>
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<td valign="top" width="40%" headers="d0e63 ">An explicit commit operation is performed.</td>
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</tr>
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<tr><td rowspan="2" valign="top" width="20%" headers="d0e54 ">LAP</td>
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<td rowspan="2" valign="top" width="20%" headers="d0e56 ">NO</td>
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<td rowspan="2" valign="top" width="20%" headers="d0e58 ">WAIT</td>
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<td valign="top" width="40%" headers="d0e63 ">1. Resynchronization to the last agent is used to retrieve the decision
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to commit or to roll back.</td>
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</tr>
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<tr><td valign="top" width="40%" headers="d0e63 ">2. The returned decision to commit or to roll back is performed. It
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is considered an explicit operation.</td>
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</tr>
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<tr><td rowspan="2" valign="top" width="20%" headers="d0e54 ">LAP</td>
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<td rowspan="2" valign="top" width="20%" headers="d0e56 ">YES</td>
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<td rowspan="2" valign="top" width="20%" headers="d0e58 ">WAIT</td>
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<td valign="top" width="40%" headers="d0e63 ">1. The last agent API is called to retrieve the commit or rollback
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decision.</td>
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</tr>
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<tr><td valign="top" width="40%" headers="d0e63 ">2. The commit or rollback operation is performed. It is considered
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an explicit operation.</td>
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</tr>
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<tr><td rowspan="2" valign="top" width="20%" headers="d0e54 ">LAP</td>
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<td rowspan="2" valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">C</td>
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<td valign="top" width="40%" headers="d0e63 ">An implicit commit operation is performed.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e58 ">R</td>
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<td valign="top" width="40%" headers="d0e63 ">An implicit rollback operation is performed.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e54 ">CMT</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">N/A</td>
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<td valign="top" width="40%" headers="d0e63 ">A commit operation has already completed for this commitment definition
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and any downstream locations. The commit operation is complete.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e54 ">VRO</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">N/A</td>
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<td valign="top" width="40%" headers="d0e63 ">The local and remote agents voted to read-only. All downstream agents
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must also have voted to read-only. No action is required.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e54 ">RBR</td>
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<td valign="top" width="20%" headers="d0e56 ">N/A</td>
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<td valign="top" width="20%" headers="d0e58 ">N/A</td>
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<td valign="top" width="40%" headers="d0e63 ">A rollback operation is required. An explicit rollback operation is
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performed.</td>
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</tr>
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<tr><td colspan="4" valign="top" headers="d0e54 d0e56 d0e58 d0e63 "> <div class="note"><span class="notetitle">Note:</span> <p><sup>1</sup> You can change
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the <samp class="codeph">Action if Endjob</samp> option with the Change Commitment Options
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(QTNCHGCO) API.</p>
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<p><sup>2</sup>If the commitment definition is associated
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with an X/Open global transaction, the following events occur:</p>
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<ul><li>If the job that started the transaction ends, the transaction is left
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in a prepared state until the XA TM either commits it or rolls it back. The
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XA transaction branch state will be left at Prepared (S3) in this case.</li>
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<li>For transaction-scoped locks only, if the SQL server job that the transaction's
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work is being routed to is ended, a forced rollback is implicitly performed.
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The XA transaction branch state will be changed to Heuristically Completed
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(S5) in this case.</li>
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</ul>
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</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>The following table shows the actions the system takes when an activation
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group ends and applies only to transactions with job-scoped locks. The system
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actions are based on the following items:</p>
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<ul><li>The state of the transaction. (It is always reset (RST) when an activation
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group ends.)</li>
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<li>How the activation group ends-normally or abnormally.</li>
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<li>Whether an API resource is the last agent. <div class="note"><span class="notetitle">Note:</span> If an API resource is
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registered as the last agent, this gives control of the commit or rollback
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decision to the last agent. The result of the decision is considered an explicit
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operation</div>
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</li>
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</ul>
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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" width="20%" id="d0e248">State</th>
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<th valign="top" width="20%" id="d0e250">Last agent API</th>
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<th valign="top" width="20%" id="d0e252">Type of end</th>
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<th valign="top" width="40%" id="d0e254">Commit or rollback operation</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="20%" headers="d0e248 ">RST</td>
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<td valign="top" width="20%" headers="d0e250 ">No</td>
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<td valign="top" width="20%" headers="d0e252 ">Normal</td>
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<td valign="top" width="40%" headers="d0e254 ">An implicit commit operation is performed. If protected conversations
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exist, the commitment definition will become the root initiator of the commit
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operation.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e248 ">RST</td>
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<td valign="top" width="20%" headers="d0e250 ">No</td>
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<td valign="top" width="20%" headers="d0e252 ">Abnormal</td>
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<td valign="top" width="40%" headers="d0e254 ">An implicit rollback is performed.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e248 ">RST</td>
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<td valign="top" width="20%" headers="d0e250 ">Yes</td>
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<td valign="top" width="20%" headers="d0e252 ">Normal</td>
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<td valign="top" width="40%" headers="d0e254 ">The API exit program is called. The commit or rollback operation is
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determined by the API.</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e248 ">RST</td>
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<td valign="top" width="20%" headers="d0e250 ">Yes</td>
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<td valign="top" width="20%" headers="d0e252 ">Abnormal</td>
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<td valign="top" width="40%" headers="d0e254 ">The API exit program is called. The commit or rollback operation is
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determined by the API.</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="rzakjsysteminit.htm" title="The system can end commitment control, or perform an implicit commit or rollback operation. Sometimes the system-initiated end of commitment control is normal. Other times, commitment control ends with an abnormal system or job end.">System-initiated end of 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="rzakjabmnlend.htm" title="This topic applies only to commitment definitions with job-scoped locks.">Commitment control during abnormal system or job end</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/QTNCHGCO.htm">Change Commitment Options (QTNCHGCO) API</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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