On Mon, Jun 8, 2009 at 8:33 PM, Bill Moran <wmoran(at)potentialtech(dot)com> wrote:
>
> Perhaps you want to take an exclusive lock on the table? The operation
> you describe seems to suggest that you'd want to guarantee exclusive
> write access to the table.
>
Exclusive table lock is a bit excessive IMO. Locking particular group
should be good, though it is not quite straightforward to achieve. I'd use
advisory locks or would lock a row in a parent group table (if such table
exists, if not - it might be worth to make one) referenced by rows in
question.