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HTML
141 lines
6.1 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>txn commit</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB TCL API Reference" />
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<link rel="up" href="tclapi.html" title="Chapter 1. Berkeley DB Tcl APIs" />
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<link rel="prev" href="txn_checkpoint.html" title="env txn_checkpoint" />
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<link rel="next" href="version.html" title="berkdb version" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center"><span xmlns="http://www.w3.org/1999/xhtml" class="emphasis"><em>txn</em></span> commit</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="txn_checkpoint.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 1.
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Berkeley DB Tcl APIs
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="version.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="txn_commit"></a><span class="emphasis"><em>txn</em></span> commit</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">txn commit
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[-nosync]
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[-sync] </pre>
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<p>
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The <span class="emphasis"><em>txn</em></span> <span class="bold"><strong>commit</strong></span>
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command ends the transaction.
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</p>
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<p>
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In the case of nested transactions, if the transaction is a parent
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transaction with unresolved (neither committed or aborted) child
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transactions, the child transactions are aborted and the commit of the
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parent will succeed.
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</p>
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<p>
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In the case of nested transactions, if the transaction is a child
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transaction, its locks are not released, but are acquired by its
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parent. Although the commit of the child transaction will succeed, the
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actual resolution of the child transaction is postponed until the
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parent transaction is committed or aborted; that is, if its parent
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transaction commits, it will be committed, and if its parent
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transaction aborts, it will be aborted.
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</p>
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<p>
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If the <span class="bold"><strong>-nosync</strong></span> option is not
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specified, a commit log record is written and flushed to disk, as are
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all previously written log records.
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</p>
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<p>
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The options are as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>-nosync</strong></span>
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</p>
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<p>
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Do not synchronously flush the log. This means the transaction will
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exhibit the ACI (atomicity, consistency, and isolation) properties,
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but not D (durability); that is, database integrity will be
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maintained, but it is possible that this transaction may be undone
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during recovery instead of being redone.
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</p>
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<p>
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This behavior may be set for an entire Berkeley DB environment as part
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of the <span class="bold"><strong>berkdb env</strong></span> call.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-sync</strong></span>
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</p>
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<p>
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Synchronously flush the log. This means the transaction will exhibit
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all of the ACID (atomicity, consistency, isolation and durability)
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properties.
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</p>
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<p>
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This behavior is the default for Berkeley DB environments unless the
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<span class="bold"><strong>-nosync</strong></span> option was specified to the
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<span class="bold"><strong>berkdb env</strong></span> or
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<span class="emphasis"><em>env</em></span> <span class="bold"><strong>txn</strong></span> calls.
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</p>
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</li>
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</ul>
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</div>
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<p>
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After <span class="emphasis"><em>txn</em></span> <span class="bold"><strong>commit</strong></span>
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has been called, regardless of its return, the <span class="bold"><strong>txn</strong></span> handle may not be accessed again. If
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<span class="emphasis"><em>txn</em></span> <span class="bold"><strong>commit</strong></span>
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encounters an error, this transaction and all child transactions of
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this transaction are aborted.
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</p>
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<p>
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The <span class="emphasis"><em>txn</em></span> <span class="bold"><strong>commit</strong></span>
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command returns 0 on success, and in the case of error, a Tcl error is
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thrown.
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</p>
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</div>
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<div class="navfooter">
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<hr />
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|
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<table width="100%" summary="Navigation footer">
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|
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="txn_checkpoint.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="tclapi.html">Up</a>
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|
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</td>
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|||
|
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<td width="40%" align="right"> <a accesskey="n" href="version.html">Next</a></td>
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|
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</tr>
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|
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<tr>
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|
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<td width="40%" align="left" valign="top"><span class="emphasis"><em>env</em></span> txn_checkpoint </td>
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|
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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|
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</td>
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<td width="40%" align="right" valign="top"> berkdb version</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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