EJBCache

Configuration for the cache of enterprise bean instances. Each EJB container maintains a cache for ready access. Specify settings governing the cache size and a policy for removing unused items from the cache.

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Attributes Summary
cleanupInterval	Specifies the interval at which the container attempts to remove unused items from the cache in order to reduce the total number of items to the value of the cache size.
cacheSize	Number of buckets in the active instance list within the EJB container.

Attribute Details

cleanupInterval

Specifies the interval at which the container attempts to remove unused items from the cache in order to reduce the total number of items to the value of the cache size.The cache manager tries to maintain some unallocated entries that can be allocated quickly as needed. A background thread attempts to free some entries while maintaining some unallocated entries. If the thread runs while the appserver is idle, then whenthe appserver needs to allocate new cache entries, it does not pay the performance cost of removing entries from the cache. In general, increase this parameter as the cache size increases.

Data type:   Long
Default value:   3000

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cacheSize

Number of buckets in the active instance list within the enterprise bean instance, but performance is maximized if each bucket in the table has a minimum number of instances assigned to it. When the number of active instances within the container exceeds the number of buckets (that is, the cache size), the container periodically attempts to reduce the number of active instances in the table by passivating some of the active instances. For the best balance of performance and memory usage, set this value to the maximum number of active instances expected during a typical workload.The container selects the next largest prime number equal to or greater than the specified value.

Data type:   Long
Default value:   2053

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