From: <glassfish_at_javadesktop.org>
Date: Thu, 16 Jul 2009 07:16:57 PDT

http://docs.sun.com/app/docs/doc/820-4335/gicpb?a=view

This attribute will help minimize the number of validation calls (instead of calling validation routine every time a connection is provided by the pool, pool will validate it only once in the provided interval)

eg: validate-atmost-period = 60 seconds. In an interval of 60 seconds if the same connection is reused by the pool for multiple times, pool will validate it only once.
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http://forums.java.net/jive/thread.jspa?messageID=356002