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<td width="20%" align="left"><a accesskey="p" href="intro_where.html">Prev</a> </td>
<th width="60%" align="center">Chapter 1. Introduction </th>
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<div class="sect1" lang="en" xml:lang="en">
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<h2 class="title" style="clear: both"><a id="intro_products"></a>The Berkeley DB products</h2>
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<div class="toc">
<dl>
<dt>
<span class="sect2">
<a href="intro_products.html#idm140654545811440">Berkeley DB Data Store</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="intro_products.html#idm140654542438064">Berkeley DB Concurrent Data Store</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="intro_products.html#idm140654542572688">Berkeley DB Transactional Data Store</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="intro_products.html#idm140654541917536">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>
Oracle's distribution of Berkeley DB 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 information at: <a class="ulink" href="http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html" target="_top">http://www.oracle.com/technetwork/database/database-technologies/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> 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="idm140654545811440"></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. For more information, see
<a class="xref" href="cam.html" title="Chapter 10. Berkeley DB Data Store and Concurrent Data Store Applications"> Berkeley DB Data Store and Concurrent Data Store Applications</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idm140654542438064"></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. For more information, see
<a class="xref" href="cam.html#cam_intro" title="Concurrent Data Store introduction">Concurrent Data Store
introduction</a>.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idm140654542572688"></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. For more information, see
<a class="xref" href="transapp.html#transapp_intro" title="Transactional Data Store introduction">Transactional Data Store introduction</a>.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idm140654541917536"></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>
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