Sun Microsystems 820433510 manual 4EJB Pool Statistics, 5EJB Cache Statistics

			About Monitoring
TABLE 18–4EJB Pool Statistics
	Attribute Name	Data Type	Description
	numbeansinpool	BoundedRangeStatistic	Number of EJB’s in the associated pool,
			providing an idea about how the pool
			is changing.
	numthreadswaiting	BoundedRangeStatistic	Number of threads waiting for free
			beans, giving an indication of possible
			congestion of requests.
	totalbeanscreated	CountStatistic	Number of beans created in associated
			pool since the gathering of data
			started.
	totalbeansdestroyed	CountStatistic	Number of beans destroyed from
			associated pool since the gathering of
			data started.
	jmsmaxmessagesload	CountStatistic	The maximum number of messages to
			load into a JMS session at one time for
			a message-driven bean to serve.
			Default is 1. Applies only to pools for
			message driven beans.

The statistics available for EJB caches are listed in the following table.

TABLE 18–5EJB Cache Statistics

Attribute Name	Data Type	Description
cachemisses	BoundedRangeStatistic	The number of times a user request does not
		find a bean in the cache.
cachehits	BoundedRangeStatistic	The number of times a user request found an
		entry in the cache.
numbeansincache	BoundedRangeStatistic	The number of beans in the cache. This is the
		current size of the cache.
numpassivations	CountStatistic	Number of passivated beans. Applies only to
		stateful session beans.
numpassivationerrors	CountStatistic	Number of errors during passivation. Applies
		only to stateful session beans.
numexpiredsessionsremoved	CountStatistic	Number of expired sessions removed by the
		cleanup thread. Applies only to stateful
		session beans.

Chapter 18 • Monitoring Components and Services 179