WebSphere Application Server - Express for iSeries session support has features for tuning session performance and operating characteristics. You configure these options in the WebSphere administrative console. The settings are listed by which page in the console that they appear.
Session management
The Session Management page of the console contains these settings that are related to performance tuning:
Overflow and Maximum in-memory session count
These settings specify the maximum number of sessions that are retained in memory, and whether or not to ever exceed that number. For more information, see Maximum in-memory session count.
Serialize session access
Specifies that concurrent session access in a given server is not allowed.
Schedule invalidation
Instead of relying on the periodic invalidation timer that runs on an interval based on the session timeout parameter, you can set specific times for the session management facility to scan for invalidated sessions in a distributed environment. For more information, see Configure scheduled invalidation.