1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>The Berkeley DB products</title> 7 <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" /> 10 <link rel="up" href="intro.html" title="Chapter 1. Introduction" /> 11 <link rel="prev" href="intro_where.html" title="Where does Berkeley DB run?" /> 12 <link rel="next" href="am_conf.html" title="Chapter 2. Access Method Configuration" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">The Berkeley DB products</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="intro_where.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 1. 23 Introduction 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="am_conf.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="intro_products"></a>The Berkeley DB products</h2> 35 </div> 36 </div> 37 </div> 38 <div class="toc"> 39 <dl> 40 <dt> 41 <span class="sect2"> 42 <a href="intro_products.html#id1587931">Berkeley DB Data Store</a> 43 </span> 44 </dt> 45 <dt> 46 <span class="sect2"> 47 <a href="intro_products.html#id1588210">Berkeley DB Concurrent Data Store</a> 48 </span> 49 </dt> 50 <dt> 51 <span class="sect2"> 52 <a href="intro_products.html#id1588893">Berkeley DB Transactional Data Store</a> 53 </span> 54 </dt> 55 <dt> 56 <span class="sect2"> 57 <a href="intro_products.html#id1587492">Berkeley DB High Availability</a> 58 </span> 59 </dt> 60 </dl> 61 </div> 62 <p>Oracle licenses four different products that use the Berkeley DB technology. 63Each product offers a distinct level of database support. It is not 64possible to mix-and-match products, that is, each application or group 65of applications must use the same Berkeley DB product.</p> 66 <p>All four products are included in the single Open Source distribution 67of Berkeley DB from Oracle, and building that distribution automatically 68builds all four products. Each product adds new interfaces and services 69to the product that precedes it in the list. As a result, developers 70can download Berkeley DB and build an application that does only single-user, 71read-only database access, and easily add support later for more users 72and more complex database access patterns.</p> 73 <p>Users who distribute Berkeley DB must ensure that they are licensed for the 74Berkeley DB interfaces they use. Information on licensing is available from 75Oracle.</p> 76 <div class="sect2" lang="en" xml:lang="en"> 77 <div class="titlepage"> 78 <div> 79 <div> 80 <h3 class="title"><a id="id1587931"></a>Berkeley DB Data Store</h3> 81 </div> 82 </div> 83 </div> 84 <p>The Berkeley DB Data Store product is an embeddable, high-performance data store. It 85supports multiple concurrent threads of control (including multiple 86processes and multiple threads of control within a process) reading 87information managed by Berkeley DB. When updates are required, only a single 88thread of control may be using the database. The Berkeley DB Data Store does no locking, 89and so provides no guarantees of correct behavior if more than one 90thread of control is updating the database at a time. The Berkeley DB Data Store is 91intended for use in read-only applications or applications which can 92guarantee no more than one thread of control will ever update the 93database at a time.</p> 94 </div> 95 <div class="sect2" lang="en" xml:lang="en"> 96 <div class="titlepage"> 97 <div> 98 <div> 99 <h3 class="title"><a id="id1588210"></a>Berkeley DB Concurrent Data Store</h3> 100 </div> 101 </div> 102 </div> 103 <p>The Berkeley DB Concurrent Data Store product adds multiple-reader, single writer capabilities to 104the Berkeley DB Data Store product, supporting applications that need concurrent updates 105and do not want to implement their own locking protocols. Berkeley DB Concurrent Data Store is 106intended for applications that require occasional write access to a 107database that is largely used for reading.</p> 108 </div> 109 <div class="sect2" lang="en" xml:lang="en"> 110 <div class="titlepage"> 111 <div> 112 <div> 113 <h3 class="title"><a id="id1588893"></a>Berkeley DB Transactional Data Store</h3> 114 </div> 115 </div> 116 </div> 117 <p>The Berkeley DB Transactional Data Store product adds full transactional support and recoverability 118to the Berkeley DB Data Store product. Berkeley DB Transactional Data Store is intended for applications that require 119industrial-strength database services, including excellent performance 120under high-concurrency workloads with a mixture of readers and writers, 121the ability to commit or roll back multiple changes to the database at 122a single instant, and the guarantee that even in the event of a 123catastrophic system or hardware failure, any committed database changes 124will be preserved.</p> 125 </div> 126 <div class="sect2" lang="en" xml:lang="en"> 127 <div class="titlepage"> 128 <div> 129 <div> 130 <h3 class="title"><a id="id1587492"></a>Berkeley DB High Availability</h3> 131 </div> 132 </div> 133 </div> 134 <p>The Berkeley DB High Availability product support for data replication. A single master system 135handles all updates, and distributes them to as many replicas as the 136application requires. All replicas can handle read requests during 137normal processing. If the master system fails for any reason, one of 138the replicas takes over as the new master system, and distributes 139updates to the remaining replicas.</p> 140 </div> 141 </div> 142 <div class="navfooter"> 143 <hr /> 144 <table width="100%" summary="Navigation footer"> 145 <tr> 146 <td width="40%" align="left"><a accesskey="p" href="intro_where.html">Prev</a> </td> 147 <td width="20%" align="center"> 148 <a accesskey="u" href="intro.html">Up</a> 149 </td> 150 <td width="40%" align="right"> <a accesskey="n" href="am_conf.html">Next</a></td> 151 </tr> 152 <tr> 153 <td width="40%" align="left" valign="top">Where does Berkeley DB run? </td> 154 <td width="20%" align="center"> 155 <a accesskey="h" href="index.html">Home</a> 156 </td> 157 <td width="40%" align="right" valign="top"> Chapter 2. 158 Access Method Configuration 159 </td> 160 </tr> 161 </table> 162 </div> 163 </body> 164</html> 165