Connection failover allows a client application to switch to an alternate Adaptive Server if the primary server becomes unavailable due to an unplanned event, like power outage or a socket failure. In the Adaptive Server Cluster Edition, client applications can failover numerous times to multiple servers using dynamic failover addresses.
With the High Availability enabled, the client application does not need to be configured to know the possible failover targets. Adaptive Server keeps the client updated with the best failover list based on cluster membership, logical cluster usage and load distribution. During failover, the client refers to the ordered failover list while attempting to reconnect. If the driver successfully connects to a server, the driver internally updates the list of host values based on the list returned. Otherwise, the driver throws a connection failure exception.
For more information about connection failover, see “Using failover in high availability systems”.
