mirror of
https://github.com/yasuhirokimura/db18
synced 2026-06-08 18:29:23 +00:00
Yasuhiro KIMURA
132 lines
5.7 KiB
HTML
132 lines
5.7 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
<html xmlns="http://www.w3.org/1999/xhtml">
|
||
<head>
|
||
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
||
<title>Slice APIs</title>
|
||
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
|
||
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
||
<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
|
||
<link rel="up" href="bdb_slices.html" title="Chapter 13. Berkeley DB Slice Support" />
|
||
<link rel="prev" href="bdb_slices.html" title="Chapter 13. Berkeley DB Slice Support" />
|
||
<link rel="next" href="slice-keys.html" title="Key Design" />
|
||
</head>
|
||
<body>
|
||
<div xmlns="" class="navheader">
|
||
<div class="libver">
|
||
<p>Library Version 18.1.40</p>
|
||
</div>
|
||
<table width="100%" summary="Navigation header">
|
||
<tr>
|
||
<th colspan="3" align="center">Slice APIs</th>
|
||
</tr>
|
||
<tr>
|
||
<td width="20%" align="left"><a accesskey="p" href="bdb_slices.html">Prev</a> </td>
|
||
<th width="60%" align="center">Chapter 13. Berkeley DB Slice Support</th>
|
||
<td width="20%" align="right"> <a accesskey="n" href="slice-keys.html">Next</a></td>
|
||
</tr>
|
||
</table>
|
||
<hr />
|
||
</div>
|
||
<div class="sect1" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h2 class="title" style="clear: both"><a id="slice-apis"></a>Slice APIs</h2>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
Most of the DB methods behave the same way with or without
|
||
a sliced environment or database. Some small differences in
|
||
behavior may result when using a sliced environment or
|
||
database, and a few methods simply do not support slices. These
|
||
differences are identified in the Berkeley DB C API Reference Guide when they occur.
|
||
</p>
|
||
<p>
|
||
In addition, sliced environments and databases offer the
|
||
following methods:
|
||
</p>
|
||
<div class="itemizedlist">
|
||
<ul type="disc">
|
||
<li>
|
||
<p>
|
||
<code class="literal"><a href="../api_reference/C/envget_slice_count.html" class="olink">DB_ENV->get_slice_count()</a></code>
|
||
</p>
|
||
<p>
|
||
Returns the number of slices configured for the
|
||
environment.
|
||
</p>
|
||
</li>
|
||
<li>
|
||
<p>
|
||
<code class="literal"><a href="../api_reference/C/envget_slices.html" class="olink">DB_ENV->get_slices()</a></code>
|
||
</p>
|
||
<p>
|
||
Returns an array of pointers to sub-environments in use to
|
||
support your sliced environment. Be aware that all
|
||
these handles are automatically closed when you
|
||
close the encompassing environment; you should not
|
||
close them explicitly.
|
||
</p>
|
||
</li>
|
||
<li>
|
||
<p>
|
||
<code class="literal"><a href="../api_reference/C/dbset_slice_callback.html" class="olink">DB->set_slice_callback()</a></code>
|
||
</p>
|
||
<p>
|
||
Sets an optional callback that is used to identify
|
||
the slice-relevant portion of your records' key.
|
||
It allows a transaction to access many different keys,
|
||
as long as the slice callback for those keys returns
|
||
the same value.
|
||
</p>
|
||
</li>
|
||
<li>
|
||
<p>
|
||
<code class="literal"><a href="../api_reference/C/dbget_slices.html" class="olink">DB->get_slices()</a></code>
|
||
</p>
|
||
<p>
|
||
Returns an array of pointers to databases in use to
|
||
support your sliced environment. There is one such
|
||
database for each slice that you configured for
|
||
your environment. Be aware that all these handles
|
||
are automatically closed when you close the
|
||
top-level database handle; you should not close
|
||
them explicitly.
|
||
</p>
|
||
</li>
|
||
<li>
|
||
<p>
|
||
<code class="literal"><a href="../api_reference/C/dbslice_lookup.html" class="olink">DB->slice_lookup()</a></code>
|
||
</p>
|
||
<p>
|
||
Returns the slice database which contains the key
|
||
that you provide to this method.
|
||
</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="navfooter">
|
||
<hr />
|
||
<table width="100%" summary="Navigation footer">
|
||
<tr>
|
||
<td width="40%" align="left"><a accesskey="p" href="bdb_slices.html">Prev</a> </td>
|
||
<td width="20%" align="center">
|
||
<a accesskey="u" href="bdb_slices.html">Up</a>
|
||
</td>
|
||
<td width="40%" align="right"> <a accesskey="n" href="slice-keys.html">Next</a></td>
|
||
</tr>
|
||
<tr>
|
||
<td width="40%" align="left" valign="top">Chapter 13. Berkeley DB Slice Support </td>
|
||
<td width="20%" align="center">
|
||
<a accesskey="h" href="index.html">Home</a>
|
||
</td>
|
||
<td width="40%" align="right" valign="top"> Key Design</td>
|
||
</tr>
|
||
</table>
|
||
</div>
|
||
</body>
|
||
</html>
|