98 lines
4.4 KiB
HTML
98 lines
4.4 KiB
HTML
<!--$Id: env_set_lg_regionmax.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::set_lg_regionmax</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::set_lg_regionmax</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::set_lg_regionmax(u_int32_t lg_regionmax);
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<p>
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int
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DbEnv::get_lg_regionmax(u_int32_t *lg_regionmaxp);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DbEnv::set_lg_regionmax</b>
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<p>Set the size of the underlying logging area of the Berkeley DB environment,
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in bytes. By default, or if the value is set to 0, the default size is
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approximately 60KB. The log region is used to store filenames, and so
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may need to be increased in size if a large number of files will be
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opened and registered with the specified Berkeley DB environment's log
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manager.</p>
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<p>The database environment's log region size may also be configured using the
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environment's <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file. The syntax of the entry in that
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file is a single line with the string "set_lg_regionmax", one or more whitespace
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characters, and the size in bytes.
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Because the <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is read when the database environment
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is opened, it will silently overrule configuration done before that
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time.</p>
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<p>The DbEnv::set_lg_regionmax method configures a database environment, not only operations
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performed using the specified <a href="../api_cxx/env_class.html">DbEnv</a> handle.</p>
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<p>The DbEnv::set_lg_regionmax method may not be called after the <a href="../api_cxx/env_open.html">DbEnv::open</a> method is
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called.
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If the database environment already exists when
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<a href="../api_cxx/env_open.html">DbEnv::open</a> is called, the information specified to DbEnv::set_lg_regionmax
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will be ignored.
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</p>
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<p>The DbEnv::set_lg_regionmax 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>lg_regionmax</b><ul compact><li>The <b>lg_regionmax</b> parameter is the size of the logging area in
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the Berkeley DB environment, in bytes.</ul>
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<br>
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<br><b>Errors</b>
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<p>The DbEnv::set_lg_regionmax 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 method was called after <a href="../api_cxx/env_open.html">DbEnv::open</a> was called; 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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<b>Description: DbEnv::get_lg_regionmax</b>
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<p>The DbEnv::get_lg_regionmax method returns the size of the underlying logging subsystem region.</p>
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<p>The DbEnv::get_lg_regionmax method may be called at any time during the life of the
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application.</p>
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<p>The DbEnv::get_lg_regionmax 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>lg_regionmaxp</b><ul compact><li>The DbEnv::get_lg_regionmax method returns the
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size of the underlying logging subsystem region in <b>lg_regionmaxp</b>.</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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