Starting the Database Instance (Restart) 
You have selected
the
database
instance you wish to start.
To start the database instance, that is to transfer it to a running state, choose Instance ® Set Online.
This function can
be performed in both the
ADMIN
operational state
and the deactivated operational state (
OFFLINE).

If this
command fails to set the database to the
ONLINE operational state,
you can look for the cause of the error in the log file
knldiag.
Choose Instance ® Admin to transfer the database instance from the deactivated operational state ( OFFLINE) to the ADMIN operational state.

Each time you
start the database instance by choosing Instance
® Online or Instance
® Admin, a copy of
the console log file (file
knldiag in the
run
directory of the database
instance) is created with the name
knldiag.old, and file
knldiag is
overwritten.
See
also:
Database
Files