Sun Microsystems 820434310 manual Pool and Cache Settings for Individual EJB Components

Max Cache Size

Max Cache Size	Maximum number of beans in the cache. Make this setting greater than one. The default value is 512. A
	value of zero indicates the cache is unbounded, which means the size of the cache is governed by Cache
	Idle Timeout and Cache Resize Quantity. The corresponding EJB deployment descriptor attribute is
	max-cache-size.
Cache Resize	Number of beans to be created or deleted when the cache is serviced by the server. Valid values are from
Quantity	zero to MAX_INTEGER, and the default is 16. The corresponding EJB deployment descriptor attribute is
	resize-quantity.
Removal Timeout	Amount of time that a stateful session bean remains passivated (idle in the backup store). If a bean was not
	accessed after this interval of time, then it is removed from the backup store and will not be accessible to
	the client. The default value is 60 minutes. The corresponding EJB deployment descriptor attribute is
	removal-timeout-in-seconds.
Removal Selection	Algorithm used to remove objects from the cache. The corresponding EJB deployment descriptor
Policy	attribute is victim-selection-policy.Choices are:
	■	NRU (not recently used). This is the default, and is actually pseudo-random selection policy.
	■	FIFO (first in, first out)
	■	LRU (least recently used)
Cache Idle	Maximum time that a stateful session bean or entity bean is allowed to be idle in the cache. After this time,
Timeout	the bean is passivated to the backup store. The default value is 600 seconds. The corresponding EJB
	deployment descriptor attribute is cache-idle-timeout-in-seconds.
Refresh period	Rate at which a read-only-bean is refreshed from the data source. Zero (0) means that the bean is never
	refreshed. The default is 600 seconds. The corresponding EJB deployment descriptor attribute is
	refresh-period-in-seconds. Note: this setting does not have a custom field in the Admin Console. To
	set it, use the Add Property button in the Additional Properties section.

Pool and Cache Settings for Individual EJB Components

Individual EJB pool and cache settings in the sun-ejb-jar.xml deployment descriptor override those of the EJB container. The following table lists the cache and pool settings for each type of EJB component.

TABLE 3–2EJB Cache and Pool Settings

	Cache Settings						Pool Settings
			cache-
			idle-			refresh-
	cache-		timeout-	removal-	victim-	period-		pool-	max-	pool-idle-
Type of	resize-	max- cache-	in-	timeout- in-	selection-	in-	steady-	resize-	pool-	timeout-in-
Bean	quantity	size	seconds	seconds	policy	seconds	pool-size	quantity	size	seconds
Stateful	X	X	X	X	X
Session
Stateless							X	X	X	X
Session

56 Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide • January 2009