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<!--$Id: products.so,v 10.13 2000/12/04 18:05:42 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: Sleepycat Software's Berkeley DB products</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Introduction</dl></h3></td>
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<td width="1%"><a href="../../ref/intro/where.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/simple_tut/intro.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>Sleepycat Software's Berkeley DB products</h1>
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<p>Sleepycat Software licenses three different products that use the Berkeley DB
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technology. Each product offers a distinct level of database support.
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It is not possible to mix-and-match products, that is, each application
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or group of applications must use the same Berkeley DB product.
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<p>All three products are included in the single Open Source distribution of
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Berkeley DB from Sleepycat Software, and building that distribution
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automatically builds all three products. Each product adds services, and
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new interfaces, to the product that precedes it in the list. As a result,
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developers can download Berkeley DB and build an application that does only
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single-user, read-only database access, and later add support for more
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users and more complex database access patterns.
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<p>Users who distribute Berkeley DB must ensure that they are licensed for the
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Berkeley DB interfaces they use. Information on licensing is available directly
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from Sleepycat Software.
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<h3>Berkeley DB Data Store</h3>
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<p>The Berkeley DB Data Store product is an embeddable, high-performance data store. It
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supports multiple concurrent threads of control to read information
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managed by Berkeley DB. When updates are required, only a single process may
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be using the database. That process may be multi-threaded, but only one
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thread of control should be allowed to update the database at any time.
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The Berkeley DB Data Store does no locking, and so provides no guarantees of correct
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behavior if more than one thread of control is updating the database at
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a time.
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<p>The Berkeley DB Data Store product includes the <a href="../../api_c/db_create.html">db_create</a> interface, the
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DB handle methods, and the methods returned by <a href="../../api_c/db_cursor.html">DB->cursor</a>.
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<p>The Berkeley DB Data Store is intended for use in single-user or read-only applications
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that can guarantee that no more than one thread of control will ever
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update the database at any time.
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<h3>Berkeley DB Concurrent Data Store</h3>
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<p>The Berkeley DB Concurrent Data Store product adds multiple-reader, single writer capabilities to
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the Berkeley DB Data Store product, supporting applications that need concurrent updates
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and do not want to implement their own locking protocols. The additional
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interfaces included with the Berkeley DB Concurrent Data Store product are <a href="../../api_c/env_create.html">db_env_create</a>, the
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<a href="../../api_c/env_open.html">DBENV->open</a> method (using the <a href="../../api_c/env_open.html#DB_INIT_CDB">DB_INIT_CDB</a> flag), and the
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<a href="../../api_c/env_close.html">DBENV->close</a> method.
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<p>Berkeley DB Concurrent Data Store is intended for applications that require occasional write access
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to a database that is largely used for reading.
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<h3>Berkeley DB Transactional Data Store</h3>
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<p>The Berkeley DB Transactional Data Store product adds full transactional support and recoverability
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to the Berkeley DB Data Store product. This product includes all of the interfaces
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in the Berkeley DB library.
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<p>Berkeley DB Transactional Data Store is intended for applications that require industrial-strength
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database services, including good performance under high-concurrency
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workloads with a mixture of readers and writers, the ability to commit
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or roll back multiple changes to the database at a single instant, and
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the guarantee that even in the event of a catastrophic system or hardware
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failure, any committed database changes will be preserved.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/intro/where.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/simple_tut/intro.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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