84 lines
4.1 KiB
HTML
84 lines
4.1 KiB
HTML
<!--$Id: txn_commit.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB: DbTxn::commit</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++">
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</head>
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<body bgcolor=white>
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<table width="100%"><tr valign=top>
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<td>
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<b>DbTxn::commit</b>
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</td>
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<td align=right>
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<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><pre>
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#include <db_cxx.h>
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<p>
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int
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DbTxn::commit(u_int32_t flags);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DbTxn::commit</b>
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<p>The DbTxn::commit method ends the transaction.</p>
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<p>In the case of nested transactions, if the transaction is a parent
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transaction, committing the parent transaction causes all unresolved
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children of the parent to be committed. In the case of nested
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transactions, if the transaction is a child transaction, its locks are
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not released, but are acquired by its parent. Although the commit of the
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child transaction will succeed, the actual resolution of the child
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transaction is postponed until the parent transaction is committed or
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aborted; that is, if its parent transaction commits, it will be
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committed; and if its parent transaction aborts, it will be aborted.</p>
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<p>All cursors opened within the transaction must be closed before the
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transaction is committed.</p>
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<p>After DbTxn::commit has been called, regardless of its return, the
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<a href="../api_cxx/txn_class.html">DbTxn</a> handle may not be accessed again. If DbTxn::commit
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encounters an error, the transaction and all child transactions of the
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transaction are aborted.</p>
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<p>The DbTxn::commit method
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either returns a non-zero error value
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or throws an exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</p>
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<b>Parameters</b> <br>
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<b>flags</b><ul compact><li>The <b>flags</b> parameter must be set to 0 or
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one of the following values:
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<br>
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<b><a name="DB_TXN_NOSYNC">DB_TXN_NOSYNC</a></b><ul compact><li>Do not synchronously flush the log. This means the transaction will
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exhibit the ACI (atomicity, consistency, and isolation) properties, but
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not D (durability); that is, database integrity will be maintained, but
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it is possible that this transaction may be undone during recovery.
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<p>This behavior may be set for a Berkeley DB environment using the
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<a href="../api_cxx/env_set_flags.html">DbEnv::set_flags</a> method or for a single transaction using the
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<a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a> method. Any value specified to this method overrides
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both of those settings.</p></ul>
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<b><a name="DB_TXN_SYNC">DB_TXN_SYNC</a></b><ul compact><li>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>This behavior is the default for Berkeley DB environments unless the
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<a href="../api_cxx/env_set_flags.html#DB_TXN_NOSYNC">DB_TXN_NOSYNC</a> flag was specified to the
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<a href="../api_cxx/env_set_flags.html">DbEnv::set_flags</a> method. This behavior may also be set for a single
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transaction using the <a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a> method. Any value specified to this
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method overrides both of those settings.</p></ul>
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<br></ul>
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<br>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
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<br><b>See Also</b>
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<a href="../api_cxx/txn_list.html">Transaction Subsystem and Related Methods</a>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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</body>
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</html>
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