Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> writes:
> There is a "gamblers lunch", for those willing to risk total system
> failure and the lives of there first born child.
Aw, it's not that dangerous ;-). You can improve your odds considerably
if you issue BEGIN; before you start dorking with the system tables,
and COMMIT only after you're satisfied you have things right. If you
realize you blew it, ROLLBACK.
Still, I'd recommend practicing on a scratch database before you do it
for real.
regards, tom lane