In a database environment where redundancy settings are enabled, if the system determines that the active virtual database server is down or unavailable, the system switches to the standby virtual database server. This operation is called failover.

A failover occurs when one of the following events is detected on the active virtual database server:

  • Failure of a physical host
  • Failure of an active virtual database server
  • Changing of the virtual database server type
  • Expansion of the database data area
  • Restarting of a virtual database server by specifying "forced failover"
Note: After a failover occurs, it will take about one to five minutes to switch from the active server to the standby server.
Important: If a failover occurs, the connection to the database will be lost. Therefore, you must implement the process to reconnect to the database on the application side.