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<title>DB_ENV->set_mp_max_write()</title>
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<p>Library Version 11.2.5.2</p>
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<th colspan="3" align="center">DB_ENV->set_mp_max_write()</th>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="mempset_mp_max_openfd.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 8.
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The DB_MPOOLFILE Handle
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</th>
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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="mempset_mp_max_write"></a>DB_ENV->set_mp_max_write()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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DB_ENV->set_mp_max_write(DB_ENV *env, int maxwrite,
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db_timeout_t maxwrite_sleep); </pre>
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<p>
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The <code class="methodname">DB_ENV->set_mp_max_write()</code> method limits the number of sequential
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write operations scheduled by the library when flushing dirty pages
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from the cache.
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</p>
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<p>
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The database environment's maximum number of sequential write
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operations may also be configured using the environment's
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<a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax of the entry in that file is a single
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line with the string "set_mp_max_write", one or more whitespace
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characters, and the maximum number of sequential writes and the
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number of microseconds to sleep, also separated by whitespace
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characters. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read when the database
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environment is opened, it will silently overrule configuration
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done before that time.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_mp_max_write()</code> method configures a database
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environment, not only operations performed using the specified
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_mp_max_write()</code> <span>
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<span>
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method returns a non-zero error value on failure and 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" 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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<h3 class="title"><a id="id3916298"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3916305"></a>maxwrite</h4>
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</div>
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</div>
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</div>
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<p>
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The maximum number of sequential write operations scheduled by the
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library when flushing dirty pages from the cache, or 0 if there is no
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limitation on the number of sequential write operations.
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</p>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3916459"></a>maxwrite_sleep</h4>
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</div>
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</div>
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</div>
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<p>
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The number of microseconds the thread of control should pause before
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scheduling further write operations. It must be specified as an
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unsigned 32-bit number of microseconds, limiting the maximum pause to
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roughly 71 minutes.
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</p>
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</div>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3916324"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DB_ENV->set_mp_max_write()</code> <span>
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<span>
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method may fail and return one of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" 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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<h4 class="title"><a id="id3916171"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3916166"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>, <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a>
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</p>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3916389"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="mempset_mp_max_openfd.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="memp.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envset_mp_mmapsize.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DB_ENV->set_mp_max_openfd() </td>
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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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</td>
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<td width="40%" align="right" valign="top"> DB_ENV->set_mp_mmapsize()</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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