Prune the db2diag.log file

Hello!

In my company we use TSM (backup tool) that uses DB2 as its database. At this
time the DB2 log file is too large and need to reduce or prune it as soon as
possible. My problem is that I've lost the user/password of the DB2 instance.

I wonder if I can run the command (db2log -A) anyway, I meant run the
command using administrator privileges.

Do I really need the DB2 instance user/password in order to run this command?

I need to know, How to reset the DB2 instance user/password?


Thanks in advance