The Cluster Edition allows a single installation of Adaptive Server to operate on multiple nodes as a shared-disk cluster environment with a single-system view. Each server runs on a separate node; referred to as a server instance or instance.The Adaptive Server Enterprise Cluster Edition allows you to “scale” the workload using multiple physical and logical hosts. If instances in the cluster go down, one or more of the still-running instances will take over the workload of the instance that is down.The cluster manages which instance a client connects to. If one instance is overloaded, the cluster balances the load by shifting clients to other, more available instances.
The primary advantages of the Cluster Edition include:
Improved availability – the shared-disk nature of the architecture means that applications can continue to run as long as a single cluster member remains viable, even after several others have failed.
Simple management – does not require data to be repartitioned as cluster membership changes, because data is shared by all instances.
The Cluster Edition provides a distributed architecture.
Internode communication takes place via a network interconnection,
rather than via shared memory. Applications that minimize internode
messaging yield the best performance in the Cluster Edition environment.
For more information on Adaptive Server Enterprise Cluster Edition see the Users Guide to Clusters.
