In database multiplexing mode that uses the Mirroring Controller option, switch and disconnection are performed automatically. If a switch occurs when executing a reference job for the standby server, it may affect the performance of that job. The reason is that, on the new primary server (that is, the original standby server), both the main job that was being executed on the original primary server and the reference job that was being executed on the original standby server will be processed. Therefore, before executing a job using this configuration, give careful consideration to the server resource estimates, and the likely impact on performance.
Accordingly, if you are concerned about the impact on performance, pause the reference job on the original standby server, change the original primary server to the new standby server, and then resume the reference job for the new standby server.
