Persistent to database

If session data is persisted to a database and the appserver fails, another server can retrieve the session from the database. Therefore, the client request can continue to be processed. The session data loss amount depends on the time difference between the last update and the failure time, with the maximum being the update interval (see 9.3.2, Session update methods and failover session data loss).

If the database service is not available, the adoptive server cannot retrieve the session from the database. The WebSphere session manager will retry for a while and the client appears to hang. If the database is still not available, the failover process will fail. Therefore, the session database is an SPOF. We discuss how to enable database high availability in Chapter 12, WebSphere data management high availability.

  Prev | Home | Next

 

WebSphere is a trademark of the IBM Corporation in the United States, other countries, or both.

 

IBM is a trademark of the IBM Corporation in the United States, other countries, or both.