OracleAS provides several features for ensuring application-level high availability, including session state replication and application state replication.
Session state replication
Session state replication is a high availability solution that is implemented in OracleAS using OC4J islands, where the OC4J processes replicate their session state with other processes in the island. This replication provides a backup in case of system failure. In most cases, multiple HTTP requests from the same client will need to access a J2EE application on an OracleAS instance. If the OC4J process for this application fails, the state of the client request may get lost. OracleAS prevents this loss of state by providing state-safe, stateful, and stateless applications. (more…)
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