Persistent session
You have the options to put the session data in memory or to store it in a database. Thus, you can use the WebSphere V5 Data Replication Service (memory-to-memory replication) or database as mechanisms for session failover. If you choose to store your session data into a database, a highly available session database is achieved through clustering software or parallel database. During a failover, the session data will be temporally unavailable and any request that requires a persistent session will fail. After a failover, the session data will become available again and any request will succeed after the first retry.
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