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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
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<title>Berkeley DB: DbEnv::set_mp_max_write</title>
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<b>DbEnv::set_mp_max_write</b>
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<b><pre>
#include &lt;db_cxx.h&gt;
<p>
int
DbEnv::set_mp_max_write(int maxwrite, db_timeout_t maxwrite_sleep);
<p>
int
DbEnv::get_mp_max_write(int *maxwritep, db_timeout_t *maxwrite_sleepp);
</pre></b>
<hr size=1 noshade>
<b>Description: DbEnv::set_mp_max_write</b>
<p>The DbEnv::set_mp_max_write method limits the number of sequential write
operations scheduled by the library when flushing dirty pages from the
cache.</p>
<p>The database environment's maximum number of sequential write operations may also be configured using the
environment's <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file. The syntax of the entry in that
file is a single line with the string "set_mp_max_write", one or more whitespace
characters, and the maximum number of sequential writes and the number of microseconds
to sleep, also separated by whitespace characters.
Because the <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is read when the database environment
is opened, it will silently overrule configuration done before that
time.</p>
<p>The DbEnv::set_mp_max_write method configures a database environment, not only operations
performed using the specified <a href="../api_cxx/env_class.html">DbEnv</a> handle.</p>
<p>The DbEnv::set_mp_max_write method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</p>
<b>Parameters</b> <br>
<b>maxwrite</b><ul compact><li>The maximum number of sequential write operations scheduled by the
library when flushing dirty pages from the cache, or 0 if there is
no limitation on the number of sequential write operations.</ul>
<b>maxwrite_sleep</b><ul compact><li>The number of microseconds the thread of control should pause before
scheduling further write operations. It must be specified as an
unsigned 32-bit number of microseconds, limiting the maximum pause to
roughly 71 minutes.</ul>
<br>
<br><b>Errors</b>
<p>The DbEnv::set_mp_max_write method
may fail and throw
<a href="../api_cxx/except_class.html">DbException</a>,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:</p>
<br>
<b>EINVAL</b><ul compact><li>An
invalid flag value or parameter was specified.</ul>
<br>
<hr size=1 noshade>
<b>Description: DbEnv::get_mp_max_write</b>
<p>The DbEnv::get_mp_max_write method returns the current maximum number of
sequential write operations and microseconds to pause.</p>
<p>The DbEnv::get_mp_max_write method may be called at any time during the life of the
application.</p>
<p>The DbEnv::get_mp_max_write method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</p>
<b>Parameters</b> <br>
<b>maxwritep</b><ul compact><li>The <b>maxwritep</b> parameter references memory into which
the maximum number of sequential write operations is copied.</ul>
<b>maxwrite_sleepp</b><ul compact><li>The <b>maxwrite_sleepp</b> parameter references memory into which
the microseconds to pause before scheduling further write operations is copied.</ul>
<br>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
<br><b>See Also</b>
<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
</tt>
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