When database multiplexing mode is used, use the mc_ctl command to start and stop the instance and Mirroring Controller at the same time.
Do not start or stop the instance by itself.
Execute the mc_ctl command with the -f option specified.
If you start Mirroring Controller and the instance without specifying the -f option, start Mirroring Controller and then execute the mc_ctl command in enable-failover mode, or restart Mirroring Controller with the -f option specified.
When only the instance is started and stopped, the following will happen:
When only the instance is started
Features such as automatic switch and automatic disconnection will not work until Mirroring Controller is started.
When only the instance is stopped
Mirroring Controller determines that an error has occurred in the instance, and performs an unnecessary automatic switch.
Automatic switch may also stop working correctly in some cases.
When only the instance is started and stopped, the following will happen:
When only the instance is started
Errors indicated in "5.1 What is Database Multiplexing Mode" will not be detected until Mirroring Controller is started.
When only the instance is stopped
Mirroring Controller determines that an error has occurred in the instance, and outputs an error to the system log.
