<Atul.Goel@globaldatapoint.com> writes:
> I by mistake ran a query to update a huge table with around 500000 rows and has to kill the session.
> I found the process-id from the query select * from pg_stat_activity. I killed the process using Kill -9 process_id.
> This caused all other sessions in the system to be killed and database was unreachable for a minute or so.
> MY QUESTION: Is this normal?
Yes. That is not the recommended way to cancel a query.
regards, tom lane