pginfo <pginfo(at)t1(dot)unisoftbg(dot)com> writes:
> I am using pg 7.2.3.
> If I try to start vacuum full analyze the postgresql works some time and
> stops with this message:
> NOTICE: Child itemid in update-chain marked as unused - can't continue
> repair_frag.
Ignore it (it's only a NOTICE) until you get around to updating to 7.3.
regards, tom lane