2011-09-13 17:44:24 +00:00
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<title>Db::set_pagesize()</title>
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="db.html" title="Chapter 2. The Db Handle" />
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<link rel="prev" href="dbset_msgfile.html" title="Db::set_msgfile()" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Db::set_pagesize()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbset_msgfile.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The Db Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbset_partition.html">Next</a></td>
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dbset_pagesize"></a>Db::set_pagesize()</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_cxx.h>
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int
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Db::set_pagesize(u_int32_t pagesize); </pre>
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<p>
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Set the size of the pages used to hold items in the database, in
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bytes. The minimum page size is 512 bytes, the maximum page size is
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64K bytes, and the page size must be a power-of-two. If the page size
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is not explicitly set, one is selected based on the underlying
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filesystem I/O block size. The automatically selected size has a
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lower limit of 512 bytes and an upper limit of 16K bytes.
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</p>
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<p>
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For information on tuning the Berkeley DB page size, see
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<a href="../../programmer_reference/general_am_conf.html#am_conf_pagesize" class="olink">Selecting a page size</a>.
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</p>
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<p>
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The <code class="methodname">Db::set_pagesize()</code> method configures
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a database, not only operations performed using the specified
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<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> handle.
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</p>
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<p>
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The <code class="methodname">Db::set_pagesize()</code> method may not be
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called after the <a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a>
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method is called. If the database already exists when
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<a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a> is called, the
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information specified to
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<code class="methodname">Db::set_pagesize()</code> will be ignored.
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</p>
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<p>
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If creating additional databases in a single physical file,
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information specified to
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<code class="methodname">Db::set_pagesize()</code> will be ignored and
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the page size of the existing databases will be used.
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</p>
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<p>
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The <code class="methodname">Db::set_pagesize()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3578989"></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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3578978"></a>pagesize</h4>
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2011-09-13 17:44:24 +00:00
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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 <span class="bold"><strong>pagesize</strong></span> parameter sets the
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database page size.
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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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3578908"></a>Errors</h3>
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2011-09-13 17:44:24 +00:00
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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::set_pagesize()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3579170"></a>EINVAL</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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If the method was called after <a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a>
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was called; or if 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3579192"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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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="db.html" title="Chapter 2. The Db Handle">Db</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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3579015"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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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="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
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</p>
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<td width="40%" align="right"> <a accesskey="n" href="dbset_partition.html">Next</a></td>
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<td width="40%" align="left" valign="top">Db::set_msgfile() </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 width="40%" align="right" valign="top"> Db::set_partition()</td>
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