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3.5 KiB
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<!--$Id: aix.so,v 11.11 2000/05/04 17:11:19 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: AIX</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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<body bgcolor=white>
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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>Building Berkeley DB for UNIX systems</dl></h3></td>
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<td width="1%"><a href="../../ref/build_unix/notes.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/build_unix/freebsd.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>AIX</h1>
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<p><ol>
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<p><li><b>I can't compile and run multi-threaded applications.</b>
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<p>Special compile-time flags are required when compiling threaded
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applications on AIX. If you are compiling a threaded application,
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you must compile with the _THREAD_SAFE flag and load with specific
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libraries, e.g., "-lc_r". Specifying the compiler name with a
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trailing "_r" usually performs the right actions for the system.
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<p><blockquote><pre>xlc_r ...
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cc -D_THREAD_SAFE -lc_r ...</pre></blockquote>
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<p>The Berkeley DB library will automatically build with the correct options.
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<hr size=1 noshade>
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<p><li><b>I can't run using the <a href="../../api_c/env_open.html#DB_SYSTEM_MEM">DB_SYSTEM_MEM</a> option to
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<a href="../../api_c/env_open.html">DBENV->open</a>.</b>
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<p>AIX 4.1 only allows applications to map 10 system shared memory segments.
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In AIX 4.3 this has been raised to 256K segments, but only if you set the
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environment variable "export EXTSHM=ON".
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<hr size=1 noshade>
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<p><li><b>I can't create database files larger than 1GB on AIX.</b>
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<p>Berkeley DB does not include large-file support for AIX systems by default.
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Sleepycat Software has been told that the following changes will add
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large-file support on the AIX 4.2 and later releases, but we have not
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tested them ourselves.
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<p>Add the following lines to the <b>db_config.h</b> file in your build
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directory:
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<p><blockquote><pre>#ifdef HAVE_FILE_OFFSET_BITS
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#define _LARGE_FILES /* AIX specific. */
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#endif</pre></blockquote>
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<p>Change the source code for <b>os/os_open.c</b> to always specify the
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<b>O_LARGEFILE</b> flag to the <b>open</b>(2) system call.
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<p>Recompile Berkeley DB from scratch.
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<p>Note that the documentation for the IBM Visual Age compiler states that
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it does not not support the 64-bit filesystem APIs necessary for creating
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large files, and that the ibmcxx product must be used instead. We have
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not heard if the GNU gcc compiler supports the 64-bit APIs or not.
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<p>Finally, to create large files under AIX, the filesystem has to be
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configured to support large files and the system wide user hard-limit for
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file sizes has to be greater than 1GB.
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</ol>
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<table><tr><td><br></td><td width="1%"><a href="../../ref/build_unix/notes.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/build_unix/freebsd.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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