Active Messaging supports the following client technologies of the Adaptive Server Cluster Edition:
“Login redirection” – the ability of an instance to redirect an incoming client connection to another instance prior to acknowledging the login. Login redirection occurs during the login sequence. The client application does not receive notification that it was redirected.
“Extended high availability” – in an extended failover configuration, Adaptive Server provides a list of failover addresses to “high-availability-aware” clients when they connect. This allows high-availability-aware clients or applications to fail over multiple times if the instance to which they are connected fails.
These clients are not required to have a HAFAILOVER entry in their interfaces file or directory services. However, if they do have an HAFAILOVER entry in their interfaces file or directory services, the clients continue to use this entry until Adaptive Server sends them a list of failover addresses or servers to connect to. The clients always use the latest list Adaptive Server provides.
The Active Messaging feature does not support connection
migration, which occurs when an existing client is transferred from
one instance of a cluster to another.
