YOUR database crashes after a user accidentally kills a background process.

The following command starts an instance, reads the initialization parameters from the default location, and then mounts and opens the database. (You can optionally specify a PFILE clause.)

STARTUP

If you know that media recovery is required, you can start an instance, mount a database to the instance, and have the recovery process automatically start by using the STARTUP command with the RECOVER clause:

STARTUP OPEN RECOVER

To start or stop your entire cluster database, that is, all of the instances and its enabled services, enter the following SRVCTL commands:

$ srvctl start database -db db_unique_name [-startoption start_options]