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-<!--$Id: system.so,v 11.5 2000/03/18 21:43:20 bostic Exp $-->
-<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
-<!--All rights reserved.-->
-<html>
-<head>
-<title>Berkeley DB Reference Guide: Release 2.0: system integration</title>
-<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
-<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
-</head>
-<body bgcolor=white>
-<table><tr valign=top>
-<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></h3></td>
-<td width="1%"><a href="../../ref/upgrade.2.0/intro.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/upgrade.2.0/convert.html"><img src="../../images/next.gif" alt="Next"></a>
-</td></tr></table>
-<p>
-<h1 align=center>Release 2.0: system integration</h1>
-<p><ol>
-<p><li>It is possible to maintain both the Berkeley DB 1.85 and Berkeley DB version 2
-libraries on your system. However, the <b>db.h</b> include file that
-was distributed with Berkeley DB 1.85 is not compatible with the <b>db.h</b>
-file distributed with Berkeley DB version 2, so you will have to install them
-in different locations. In addition, both the Berkeley DB 1.85 and Berkeley DB
-version 2 libraries are named <b>libdb.a</b>.
-<p>As the Berkeley DB 1.85 library did not have an installation target in the
-Makefile, there's no way to know exactly where it was installed on the
-system. In addition, many vendors included it in the C library instead
-of as a separate library, and so it may actually be part of libc and the
-<b>db.h</b> include file may be installed in <b>/usr/include</b>.
-<p>For these reasons, the simplest way to maintain both libraries is to
-install Berkeley DB version 2 in a completely separate area of your system.
-The Berkeley DB version 2 installation process allows you to install into a
-standalone directory hierarchy on your system. See the
-<a href="../../ref/build_unix/intro.html">Building for UNIX systems</a>
-documentation for more information and instructions on how to install the
-Berkeley DB version 2 library, include files and documentation into specific
-locations.
-<p><li>Alternatively, you can replace Berkeley DB 1.85 on your system with Berkeley DB
-version 2. In this case, you'll probably want to install Berkeley DB version
-2 in the normal place on your system, wherever that may be, and delete
-the Berkeley DB 1.85 include files, manual pages and libraries.
-<p>To replace 1.85 with version 2, you must either convert your 1.85
-applications to use the version 2 API or build the Berkeley DB version 2 library
-to include Berkeley DB 1.85 interface compatibility code. Whether converting
-your applications to use the version 2 interface or using the version 1.85
-compatibility API, you will need to recompile or relink your 1.85
-applications, and you must convert any persistent application databases
-to the Berkeley DB version 2 database formats.
-<p>If you want to recompile your Berkeley DB 1.85 applications, you will have to
-change them to include the file <b>db_185.h</b> instead of
-<b>db.h</b>. (The <b>db_185.h</b> file is automatically installed
-during the Berkeley DB version 2 installation process.) You can then recompile
-the applications, linking them against the Berkeley DB version 2 library.
-<p>For more information on compiling the Berkeley DB 1.85 compatibility code into
-the Berkeley DB version 2 library, see <a href="../../ref/build_unix/intro.html">Building for UNIX platforms</a>.
-<p>For more information on converting databases from the Berkeley DB 1.85 formats
-to the Berkeley DB version 2 formats, see the <a href="../../utility/db_dump.html">db_dump185</a> and
-<a href="../../utility/db_load.html">db_load</a> documentation.
-<p><li>Finally, although we certainly do not recommend it, it is possible to
-load both Berkeley DB 1.85 and Berkeley DB version 2 into the same library.
-Similarly, it is possible to use both Berkeley DB 1.85 and Berkeley DB version 2
-within a single application, although it is not possible to use them from
-within the same file.
-<p>The name space in Berkeley DB version 2 has been changed from that of previous
-Berkeley DB versions, notably version 1.85, for portability and consistency
-reasons. The only name collisions in the two libraries are the names used
-by the historic <a href="../../api_c/dbm.html">dbm</a>, <a href="../../api_c/dbm.html">ndbm</a> and <a href="../../api_c/hsearch.html">hsearch</a> interfaces,
-and the Berkeley DB 1.85 compatibility interfaces in the Berkeley DB version 2
-library.
-<p>If you are loading both Berkeley DB 1.85 and Berkeley DB version 2 into a single
-library, remove the historic interfaces from one of the two library
-builds, and configure the Berkeley DB version 2 build to not include the Berkeley DB
-1.85 compatibility API, otherwise you could have collisions and undefined
-behavior. This can be done by editing the library Makefiles and
-reconfiguring and rebuilding the Berkeley DB version 2 library. Obviously, if
-you use the historic interfaces, you will get the version in the library
-from which you did not remove them. Similarly, you will not be able to
-access Berkeley DB version 2 files using the Berkeley DB 1.85 compatibility interface,
-since you have removed that from the library as well.
-</ol>
-<table><tr><td><br></td><td width="1%"><a href="../../ref/upgrade.2.0/intro.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/upgrade.2.0/convert.html"><img src="../../images/next.gif" alt="Next"></a>
-</td></tr></table>
-<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
-</body>
-</html>