Use this page to configure and manage the cache for a specific EJB container. To avoid errors from attempting to overload the cache, determine the cache absolute limit. Multiply the number of enterprise beans active in any given transaction by the total number of concurrent transactions expected. Then, add the number of active session bean instances. This value is the limit that the cache will hold.
To view this administrative console page, click Servers > Application Servers > serverName > EJB Container Settings > EJB cache settings .
Configuration tab
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, 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 | Integer |
| Units | Milliseconds |
| Range | 0 to 2 147 483 674 |
| Default | 3000 |
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, set this value to the maximum number of active instances expected during a typical workload.
| Data type | Integer |
| Units | Buckets in the hash table |
| Range | Greater than 0. The container selects the next largest prime number equal to or greater than the specified value. |
| Default | 2053 |
Related concepts
EJB containers
Related tasks
Managing EJB containers
Tuning the application serving environment
Related reference
EJB container settings