The Cluster Edition supports a single-system presentation. That is, multiple instances that make up the cluster appear to clients as a single system. New client technologies allow clients to connect logically to a cluster while remaining connected physically to individual instances. This logical connection allows Adaptive Server to redirect the client to various instances in the cluster and to dynamically provide the client with high-availability fail over data. See Chapter 2, “Client Applications and Client/ Server Interaction,” and New Features Open Server 15.0 and SDK 15.0 for Microsoft Windows, Linux, and UNIX.
New client technologies include:
Login redirection – when the client reconnects to another instance in the cluster.
Connection migration – when an established connection moves to another instance in the cluster.
Extended high-availability failover – allows the client to fail over multiple times until it finds the first available or least-loaded instance.
