Jboss & JDBC connectionpool

Hi,
We often get tonnes of database connections from jboss ,most of them inactive.
I wish to configure JDBC parameters to truncate inactive database connections. On Google I found following parameter.

Can someone advise what values are advised?
Can I monitor JDBC connections /their behaviour at jboss logs before setting  these parameters?

•      idle-timeout-minutes: This element specifies the maximum time in minutes a connection may be idle before being closed. The actual maximum time depends also on the IdleRemover scan time, which is 1/2 the smallest idle-timeout-minutes of any pool.

Thanks
crazywolf2010Asked:
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