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<title>Berkeley DB Reference Guide: Mac OS X</title>
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<td><b><dl><dt>Berkeley DB Reference Guide:<dd>Building Berkeley DB for UNIX/POSIX systems</dl></b></td>
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<p align=center><b>Mac OS X</b></p>
<ol>
<p><li><b>When trying to link multiple Berkeley DB language interfaces (for
example, Tcl, C++, Java, Python) into a single process, I get "multiple
definitions" errors from dyld.</b>
<p>To fix this problem, set the environment variable MACOSX_DEPLOYMENT_TARGET
to 10.3 (or your current version of OS X), and reconfigure and rebuild
Berkeley DB from scratch.  See the OS X ld(1) and dyld(1) man pages for information
about how OS X handles symbol namespaces, as well as undefined and
multiply-defined symbols.</p>
<p><li><b>When trying to use system-backed shared memory on OS X I see
failures about "too many open files".</b>
<p>The default number of shared memory segments on OS X is too low.  To fix
this problem, edit the file /etc/rc, changing the kern.sysv.shmmax and
kern.sysv.shmseg values as follows:</p>
<blockquote><pre>*** /etc/rc.orig        Fri Dec 19 09:34:09 2003
--- /etc/rc     Fri Dec 19 09:33:53 2003
***************
*** 84,93 ****
   # System tuning
   sysctl -w kern.maxvnodes=$(echo $(sysctl -n hw.physmem) '33554432 /
512 * 1024 +p'|dc)
! sysctl -w kern.sysv.shmmax=4194304
   sysctl -w kern.sysv.shmmin=1
   sysctl -w kern.sysv.shmmni=32
! sysctl -w kern.sysv.shmseg=8
   sysctl -w kern.sysv.shmall=1024
   if [ -f /etc/sysctl-macosxserver.conf ]; then
         awk '{ if (!-1 && -1) print $1 }' &lt;
/etc/sysctl-macosxserver.conf | while read
--- 84,93 ----
   # System tuning
   sysctl -w kern.maxvnodes=$(echo $(sysctl -n hw.physmem) '33554432 /
512 * 1024 +p'|dc)
! sysctl -w kern.sysv.shmmax=134217728
   sysctl -w kern.sysv.shmmin=1
   sysctl -w kern.sysv.shmmni=32
! sysctl -w kern.sysv.shmseg=32
   sysctl -w kern.sysv.shmall=1024
   if [ -f /etc/sysctl-macosxserver.conf ]; then
         awk '{ if (!-1 && -1) print $1 }' &lt;
/etc/sysctl-macosxserver.conf | while read</pre></blockquote>
<p>and then reboot the system.</p>
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<p><font size=1>Copyright (c) 1996,2008 Oracle.  All rights reserved.</font>
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