The function to enable and disable the DB2 database instance for automatically start is only works on Linux and UNIX operating systems environment.
If you turn on the auto start, the specific instance name will automatically start after a system restart. Else, you may need to manually start if the function is turn off.
To enable, execute below command
db2iauto -on INSTANCE-NAME
To disable, execute below command
db2iauto -off INSTANCE-NAME
