2011-09-13 17:44:24 +00:00
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<title>Db::set_heapsize()</title>
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<p>Library Version 11.2.5.2</p>
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<th colspan="3" align="center">Db::set_heapsize()</th>
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<th width="60%" align="center">Chapter 2.
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The Db Handle
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<h2 class="title" style="clear: both"><a id="dbset_heapsize"></a>Db::set_heapsize()</h2>
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<pre class="programlisting">#include <db_cxx.h>
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int
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2011-12-20 00:07:10 +00:00
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Db::set_heapsize(u_int32_t gbytes, u_int32_t bytes, u_int32_t flags);</pre>
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2011-09-13 17:44:24 +00:00
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<p>
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Sets the maximum on-disk database file size used by a database
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configured to use the Heap access method. If this method is never
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called, the database's file size can grow without bound. If this
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method is called, then the heap file can never grow larger than the
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limit defined by this method. In that case, attempts to update or
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create records in a Heap database that has reached its maximum size
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will result in a <code class="literal">DB_HEAP_FULL</code> error return.
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</p>
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<p>
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The size specified to this method must be at least three times the
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database page size. That is, a Heap database must contain at least
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three database pages. You can set the database page size using the
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<a class="xref" href="dbset_pagesize.html" title="Db::set_pagesize()">Db::set_pagesize()</a>
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method.
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</p>
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<p>
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The <code class="methodname">Db::set_heapsize()</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. Further, if this method is called on an existing
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Heap database, the size specified here must match the size used to
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create the database. Note, however, that specifying an incorrect
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size to this method will not result in an error return
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(<code class="literal">EINVAL</code>) until the database is opened.
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</p>
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<p>
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The <code class="methodname">Db::set_heapsize()</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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<h3 class="title"><a id="id3577662"></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="id3577896"></a>gbytes</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 size of the heap is set to <span class="bold"><strong>gbytes</strong></span> gigabytes plus <span class="bold"><strong>bytes</strong></span>.
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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="id3577692"></a>bytes</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 size of the heap is set to <span class="bold"><strong>gbytes</strong></span> gigabytes plus <span class="bold"><strong>bytes</strong></span>.
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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="id3577658"></a>flags</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 <span class="bold"><strong>flags</strong></span> parameter is currently
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unused, and must be set to 0.
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</p>
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</div>
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2011-09-13 17:44:24 +00:00
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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="id3577926"></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::set_heapsize()</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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<h4 class="title"><a id="id3578053"></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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If the specified heap size was too small; the method was
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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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<h3 class="title"><a id="id3578022"></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="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="id3577943"></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="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="left" valign="top">Db::set_h_nelem() </td>
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<td width="40%" align="right" valign="top"> Db::set_lorder()</td>
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