The only user exit for the arbitration server is the fencing command.

The fencing command is a user command that is called by the Mirroring Controller arbitration process if Mirroring Controller performs arbitration processing and determines that a database server is unstable.

In the fencing command, the user implements a process that isolates a database server from a cluster system by, for example, stopping the target operating system or server. The fencing command that was created is to be specified for the parameter in the arbitration configuration file. Refer to "A.4.2 Arbitration Configuration File" for information on the parameters.

• Fencing the primary server during the switch

  • Prevent the Mirroring Controller management process on the primary server from communicating with the Mirroring Controller management process on the other server.

  • Prevent applications from connecting to the primary server instance.

• Fencing the standby server during disconnection

  • Prevent the Mirroring Controller management process on the standby server from communicating with the Mirroring Controller management process on the other server.

  • Prevent applications from connecting to the standby server instance.

  • Prevent the standby server from continuing streaming replication.