How Sybase Failover works with Replication Server

To configure Sybase Failover from Replication Server to Adaptive Server, the Adaptive Server must be configured to allow connection failover.

When Adaptive Servers are in failover companion mode and the primary companion fails, the secondary companion takes over the workload. Incomplete transactions or operations that require updates to the RSSD fail. Replication Server retries existing connections, but new connections are failed over.

For Data Server Interface (DSI) connections, the DSI retries failed transactions after a brief sleep.

For RSSD connections, user commands that are executed during failover do not succeed. Internal operations (such as updates to locator, disk segment, and so on) should not fail. Replication of RSSD objects should be covered by the DSI.

Asynchronous commands (for example, subscription, routing, and standby commands) may be rejected or encounter errors and require recovery if the commands have been accepted but not completed. For example, a create subscription command may have been accepted, but the subscription may still be being created.