High Availability

Oracle Application Server 10g (9.0.4) has significantly enhanced and broadened High Availability solutions across the stack.
Oracle Application Server 10g High Availability includes the following features and enhancements for end-to-end high availability:
-> Facilities for Application High Availability:
Transparent container-managed session state replication for J2EE applications
Java Object Cache available to application developer if more control of replication required
TAF: Transparent Application Failover for database connections
->Middle Tier High Availability:
Death detection and restart of failed processes
Support for database-managed and manually configured Oracle Application Server clusters
Resource provisioning features for Grid Computing
Smart load balancing algorithms for optimal resource utilization in a Grid, including:
Round robin
Random routing
Weight-based and metric-based routing
Local affinity
-> Infrastructure High Availability:
Death Detection and restart of failed processes
Cluster-aware installer
Cold Failover Clusters:
Support for all major cluster vendors
Configuration on shared disk
Support for virtual IP/hostname on active cluster node
Active Failover Clusters:
Active/Active mode support
Infrastructure software installed on each node accessing shared database
Configuration replicated on each node
Disaster Recovery:
Disaster Recovery support for site-to-site failover
Available for both middle tiers and for Infrastructure
Uses Oracle Data Guard for Infrastructure database Disaster Recovery
Rolling Upgrade:
Support for middle tier and Infrastructure rolling upgrade from 9.0.2 to 9.0.4
Minimized planned downtime