89 lines
3.9 KiB
HTML
89 lines
3.9 KiB
HTML
<!--$Id: memp_set_flags.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: DbMpoolFile::set_flags</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>DbMpoolFile::set_flags</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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DbMpoolFile::set_flags(u_int32_t flags, bool onoff);
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<p>
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int
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DbMpoolFile::get_flags(u_int32_t *flagsp);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DbMpoolFile::set_flags</b>
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<p>Configure a file in the cache.</p>
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<p>To set the flags for a particular database, call the
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DbMpoolFile::set_flags method using the <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a> handle stored in
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the <b>mpf</b> field of the <a href="../api_cxx/db_class.html">Db</a> handle.</p>
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<p>The DbMpoolFile::set_flags 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 by bitwise inclusively <b>OR</b>'ing together one or more
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of the following values:
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<br>
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<b><a name="DB_MPOOL_NOFILE">DB_MPOOL_NOFILE</a></b><ul compact><li>If set, no backing temporary file will be opened for the specified
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in-memory database, even if it expands to fill the entire cache.
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Attempts to create new database pages after the cache has been filled
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will fail.
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<p>The DB_MPOOL_NOFILE flag configures a file in the memory pool, not only
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operations performed using the specified <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a> handle.</p>
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<p>The DB_MPOOL_NOFILE flag may be used to configure Berkeley DB at any time during
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the life of the application.</p></ul>
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<b><a name="DB_MPOOL_UNLINK">DB_MPOOL_UNLINK</a></b><ul compact><li>If set, remove the file when the last reference to it is closed.
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<p>The DB_MPOOL_NOFILE flag configures a file in the memory pool, not only
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operations performed using the specified <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a> handle.</p>
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<p>The DB_MPOOL_UNLINK flag may be used to configure Berkeley DB at any time during
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the life of the application.</p></ul>
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<br></ul>
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<b>onoff</b><ul compact><li>If <b>onoff</b> is
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false,
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the specified flags are cleared; otherwise they are set.</ul>
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<br>
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<hr size=1 noshade>
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<b>Description: DbMpoolFile::get_flags</b>
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<p>The DbMpoolFile::get_flags method returns the flags.</p>
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<p>The DbMpoolFile::get_flags method may be called at any time during the life of the
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application.</p>
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<p>The DbMpoolFile::get_flags 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>flagsp</b><ul compact><li>The DbMpoolFile::get_flags method returns the
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flags in <b>flagsp</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/mempfile_class.html">DbMpoolFile</a>
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<br><b>See Also</b>
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<a href="../api_cxx/memp_list.html">Memory Pools 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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