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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>The Berkeley DB products</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="intro.html" title="Chapter 1. Introduction" />
<link rel="prev" href="intro_where.html" title="Where does Berkeley DB run?" />
<link rel="next" href="am_conf.html" title="Chapter 2. Access Method Configuration" />
</head>
<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 11.2.5.3</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">The Berkeley DB products</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="intro_where.html">Prev</a> </td>
<th width="60%" align="center">Chapter 1.
Introduction
</th>
<td width="20%" align="right"> <a accesskey="n" href="am_conf.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="intro_products"></a>The Berkeley DB products</h2>
</div>
</div>
</div>
<div class="toc">
<dl>
<dt>
<span class="sect2">
<a href="intro_products.html#idp50715960">Berkeley DB Data Store</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="intro_products.html#idp50715552">Berkeley DB Concurrent Data Store</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="intro_products.html#idp50708368">Berkeley DB Transactional Data Store</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="intro_products.html#idp50712672">Berkeley DB High Availability</a>
</span>
</dt>
</dl>
</div>
<p>
Oracle provides four Berkeley DB products, each differing by the
level of database support that they offer.
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
Berkeley DB Data Store
</li>
<li>
Berkeley DB Concurrent Data Store
</li>
<li>
Berkeley DB Transactional Data Store
</li>
<li>
Berkeley DB High Availability
</li>
</ul>
</div>
<p>
Each product provides additional functionality to the product that
precedes it in the list. As a result, you can download Berkeley DB
and build an application that provides read-only database access
for a single-user, and later add support for more complex database
access patterns for multiple users.
</p>
<p>
The single Open Source distribution of Berkeley DB from Oracle
includes the four products and building the distribution
automatically builds all four products. However, you must use the
same Berkeley DB product throughout an application or group of
applications.
</p>
<p>
To redistribute Berkeley DB software, you must have a license for
the Berkeley DB product you use. For further details, refer to the
licensing informaion at:
<a class="ulink" href="http://www.oracle.com/technetwork/database/berkeleydb/downloads/index.html" target="_top">http://www.oracle.com/technetwork/database/berkeleydb/downloads/index.html</a>
</p>
<p>
A comparison of the four Berkeley DB product features is provided
in the following table.
</p>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col align="left" />
<col align="left" />
<col align="left" />
<col align="left" />
<col align="left" />
</colgroup>
<thead>
<tr>
<th align="center"> </th>
<th align="center">Berkeley DB Data Store</th>
<th align="center">Berkeley DB Concurrent Data Store</th>
<th align="center">Berkeley DB Transactional Data Store</th>
<th align="center">Berkeley DB High Availability</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<p>
What is this product?
</p>
</td>
<td align="left">
<p>
Provides indexed, single-reader/single-writer embedded data storage
</p>
</td>
<td align="left">
<p>
Adds simple locking with multiple-reader/single-writer capabilities
</p>
</td>
<td align="left">
<p>
Adds complete ACID transaction support, as well as recovery
</p>
</td>
<td align="left">
<p>
Adds single-master data replication across multiple physical machines
</p>
</td>
</tr>
<tr>
<td align="left">
<p>
Ensures recovery operation
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
</tr>
<tr>
<td align="left">
<p>
Provides Locking feature
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
</tr>
<tr>
<td align="left">
<p>
Provides concurrent read-write access
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
</tr>
<tr>
<td align="left">
<p>
Provides transactional support
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
</tr>
<tr>
<td align="left">
<p>
Supports SQL access
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
</tr>
<tr>
<td align="left">
<p>
Provides replication support
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
No
</p>
</td>
<td align="left">
<p>
Yes
</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50715960"></a>Berkeley DB Data Store</h3>
</div>
</div>
</div>
<p>The Berkeley DB Data Store product is an embeddable, high-performance data store. This product
supports multiple concurrent threads of control, including multiple
processes and multiple threads of control within a process.
However, Berkeley DB Data Store does not support locking,
and hence does not guarantee correct behavior if more than one
thread of control is updating the database at a time. The Berkeley DB Data Store is
intended for use in read-only applications or applications which can
guarantee no more than one thread of control updates the
database at a time.</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50715552"></a>Berkeley DB Concurrent Data Store</h3>
</div>
</div>
</div>
<p>The Berkeley DB Concurrent Data Store product adds multiple-reader, single writer capabilities to
the Berkeley DB Data Store product. This product provides built-in concurrency and locking feature.
Berkeley DB Concurrent Data Store is
intended for applications that need support for concurrent updates to a
database that is largely used for reading.</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50708368"></a>Berkeley DB Transactional Data Store</h3>
</div>
</div>
</div>
<p>The Berkeley DB Transactional Data Store product adds support for transactions and database recovery.
Berkeley DB Transactional Data Store is intended for applications that require
industrial-strength database services, including excellent performance
under high-concurrency workloads of read and write operations,
the ability to commit or roll back multiple changes to the database at
a single instant, and the guarantee that in the event of a
catastrophic system or hardware failure, all committed database changes
are preserved.</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50712672"></a>Berkeley DB High Availability</h3>
</div>
</div>
</div>
<p>The Berkeley DB High Availability product adds support for data replication. A single master system
handles all updates, and distributes these updates to multiple replicas. The number of replicas depends on the application requirements. All replicas can handle read requests during
normal processing. If the master system fails for any reason, one of
the replicas takes over as the new master system, and distributes
updates to the remaining replicas.</p>
</div>
</div>
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<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="intro_where.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="intro.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="am_conf.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Where does Berkeley DB run? </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Chapter 2.
Access Method Configuration
</td>
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