EJBCache

EJBCache

This type is a class for model objects.

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.
Package: ejbcontainer

Classifier ID:  -1
Instance class name:  * Unspecified *
Instance class:  * Unspecified *

Reference attributes having this type:
  EJBContainer.cacheSettings

Attributes Summary

cleanupInterval : ELong 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 application server is idle, then when the application server 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.

cacheSize : ELong Specifies the number of buckets in the active instance list within the EJB container. A bucket can contain more than one active 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.

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 application server is idle, then when the application server 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: ELong
    Default value:  3000
    Required:  false
    Changeable:  true
    Unsettable:  true
    Many:  false
    Ordered:  true
    Lower bound:  0
    Upper bound:  1
    Unique:  true
    Derived:  false
    Transient:  false
    Volatile:  false

cacheSize  -  Specifies the number of buckets in the active instance list within the EJB container. A bucket can contain more than one active 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: ELong
    Default value:  2053
    Required:  false
    Changeable:  true
    Unsettable:  true
    Many:  false
    Ordered:  true
    Lower bound:  0
    Upper bound:  1
    Unique:  true
    Derived:  false
    Transient:  false
    Volatile:  false

(C) COPYRIGHT International Business Machines Corp. 1996-2006

Attributes Summary
cleanupInterval : ELong	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 application server is idle, then when the application server 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.
cacheSize : ELong	Specifies the number of buckets in the active instance list within the EJB container. A bucket can contain more than one active 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.