When system switchover occurs, the following processes are performed to start HiRDB on the standby system.
The time required for activating these server processes accounts for a large part of the system switchover time. Because the time required for activating a server process is proportional to the number of resident server processes, the system switchover time increases as the number of resident processes increases. Therefore, server processes of the standby system HiRDB can be activated in advance so that no time is required during switchover for their startup processing. The time required for system switchover is reduced by the amount of time that would have been required for their activation processing. This function is called user server host hot standby. For example, activating one server process on a server machine operating at about 100 MIPS requires approximately 1 second. Therefore, eliminating this activation process should reduce system switchover time by approximately 1 second.
To use the user server hot standby function, specify Y in the pd_ha_server_process_standby operand.