78 lines
3.5 KiB
HTML
78 lines
3.5 KiB
HTML
<!--$Id: log_put.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: DbEnv::log_put</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>DbEnv::log_put</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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DbEnv::log_put(DbLsn *lsn, const Dbt *data, u_int32_t flags);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DbEnv::log_put</b>
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<p>The DbEnv::log_put method appends records to the log. The <a href="../api_cxx/lsn_class.html">DbLsn</a> of
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the put record is returned in the <b>lsn</b> parameter.</p>
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<p>The DbEnv::log_put 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>data</b><ul compact><li>The <b>data</b> parameter is the record to write to the log.
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<p>The caller is responsible for providing any necessary structure to
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<b>data</b>. (For example, in a write-ahead logging protocol, the
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application must understand what part of <b>data</b> is an operation
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code, what part is redo information, and what part is undo information.
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In addition, most transaction managers will store in <b>data</b> the
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<a href="../api_cxx/lsn_class.html">DbLsn</a> of the previous log record for the same transaction, to
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support chaining back through the transaction's log records during
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undo.)</p></ul>
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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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the following value:
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<br>
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<b><a name="DB_FLUSH">DB_FLUSH</a></b><ul compact><li>The log is forced to disk after this record is written, guaranteeing
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that all records with <a href="../api_cxx/lsn_class.html">DbLsn</a> values less than or equal to the
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one being "put" are on disk before DbEnv::log_put returns.</ul>
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<br></ul>
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<b>lsn</b><ul compact><li>The <b>lsn</b> parameter references memory into which
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the <a href="../api_cxx/lsn_class.html">DbLsn</a> of the put record is copied.</ul>
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<br>
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<br><b>Errors</b>
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<p>The <a href="../api_cxx/log_flush.html">DbEnv::log_flush</a> method
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may fail and throw
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<a href="../api_cxx/except_class.html">DbException</a>,
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encapsulating one of the following non-zero errors, or return one of
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the following non-zero errors:</p>
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<br>
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<b>EINVAL</b><ul compact><li>If the record to be logged is larger than the maximum log record; or if an
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invalid flag value or parameter was specified.</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/logc_class.html">DbLogc</a>, <a href="../api_cxx/lsn_class.html">DbLsn</a>
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<br><b>See Also</b>
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<a href="../api_cxx/log_list.html">Logging 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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