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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<!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>Database Limits and Portability</title>
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
<link rel="home" href="index.html" title="Getting Started with Berkeley DB" />
<link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB " />
<link rel="previous" href="accessmethods.html" title="Access Methods" />
<link rel="next" href="environments.html" title="Environments" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">Database Limits and Portability</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="accessmethods.html">Prev</a> </td>
<th width="60%" align="center">Chapter 1. Introduction to Berkeley DB </th>
<td width="20%" align="right"> <a accesskey="n" href="environments.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="databaseLimits"></a>Database Limits and Portability</h2>
</div>
</div>
<div></div>
</div>
<p>
Berkeley DB provides support for managing everything from very small
databases that fit entirely in memory, to extremely large databases
holding millions of records and terabytes of data. DB databases can
store up to 256 terabytes of data. Individual record keys or record
data can store up to 4 gigabytes of data.
</p>
<p>
DB's databases store data in a binary format that is portable across
platforms, even of differing endian-ness. Be aware, however, that
portability aside, some performance issues can crop up in the event that
you are using little endian architecture. See <a href="btree.html#comparators">Setting Comparison Functions</a>
for more information.
</p>
<p>
Also, DB's databases and data structures are designed for concurrent
access — they are thread-safe, and they share well across multiple
processes. That said, in order to allow multiple processes to share
databases and the cache, DB makes use of mechanisms that do not work
well on network-shared drives (NFS or Windows networks shares, for
example). For this reason, you cannot place your DB databases and
environments on network-mounted drives.
</p>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="accessmethods.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="introduction.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="environments.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Access Methods </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Environments</td>
</tr>
</table>
</div>
</body>
</html>