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182 lines
6.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DBcursor->set_priority()</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="up" href="dbc.html" title="Chapter 3. The DBcursor Handle" />
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<link rel="prev" href="dbcput.html" title="DBcursor->put()" />
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DBcursor->set_priority()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbcput.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 3.
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The DBcursor Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbt.html">Next</a></td>
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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="dbcset_priority"></a>DBcursor->set_priority()</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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DBcursor->set_priority(DBC *DbCursor, DB_CACHE_PRIORITY priority); </pre>
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<p>
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Set the cache priority for pages referenced by the
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<a class="link" href="dbc.html" title="Chapter 3. The DBcursor Handle">DBcursor</a> handle.
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</p>
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<p>
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The priority of a page biases the replacement algorithm to be more or
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less likely to discard a page when space is needed in the buffer pool.
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The bias is temporary, and pages will eventually be discarded if they
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are not referenced again. The <code class="methodname">DBcursor->set_priority()</code> method is
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only advisory, and does not guarantee pages will be treated in a
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specific way.
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</p>
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<p>
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The <code class="methodname">DBcursor->set_priority()</code> method may be called at any time during
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the life of the application.
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</p>
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<p>
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The <code class="methodname">DBcursor->set_priority()</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="idp59003712"></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="idp59022600"></a>priority</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>priority</strong></span> parameter must be set to
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one of the following values:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p><a id="dbcset_priority_DB_PRIORITY_VERY_LOW"></a>
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<code class="literal">DB_PRIORITY_VERY_LOW</code>
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</p>
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<p>
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The lowest priority: pages are the most likely to be discarded.
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</p>
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</li>
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<li>
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<p><a id="dbcset_priority_DB_PRIORITY_LOW"></a>
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<code class="literal">DB_PRIORITY_LOW</code>
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</p>
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<p>
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The next lowest priority.
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</p>
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</li>
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<li>
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<p><a id="dbcset_priority_DB_PRIORITY_DEFAULT"></a>
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<code class="literal">DB_PRIORITY_DEFAULT</code>
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</p>
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<p>
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The default priority.
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</p>
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</li>
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<li>
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<p><a id="dbcset_priority_DB_PRIORITY_HIGH"></a>
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<code class="literal">DB_PRIORITY_HIGH</code>
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</p>
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<p>
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The next highest priority.
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</p>
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</li>
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<li>
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<p><a id="dbcset_priority_DB_PRIORITY_VERY_HIGH"></a>
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<code class="literal">DB_PRIORITY_VERY_HIGH</code>
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</p>
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<p>
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The highest priority: pages are the least likely to be discarded.
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</p>
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</li>
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</ul>
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</div>
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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="idp59033464"></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="dbc.html" title="Chapter 3. The DBcursor Handle">DBcursor</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="idp59034544"></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="dbc.html#dbclist" title="Database Cursors and Related Methods">Database Cursors 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="dbcput.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="dbc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="dbt.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">DBcursor->put() </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"> Chapter 4.
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The DBT Handle
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</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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