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Date: Mon, 18 May 2009 11:52:13 -0700 (PDT)
From: Jose Luna <j-luna@rocketmail.com>
Subject: Re: too many open files
To: users@activemq.apache.org
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> At this point it is clear that it is an operating system issue.
Frederik is correct on this, I tested with CentOS 5.  Here is an example of setting the hard and soft limit: 
*                soft    nofile          8192
*                hard    nofile          65535
After that:
ulimit -n 8192
And you'll be set.

> We were using Mysql as the persitence store but took it out thinking that may be the cause. 

You'll actually be better off switching back to the jdbcPersistenceAdapter if you want to reduce the number of open files.  The AMQ persistence store opens a file for every queue created.

JLuna