"Alvaro Herrera" <> writes
> Because we can't reuse MultiXactIds at system crash (else we risk taking
> an Id which is already stored in some tuple), we need to XLog it. Not
> at the locking operation, because we don't want to log that one (too
> expensive.) We can log the current value of MultiXactId counter once in
> a while; say, one each (say) 1000 acquisitions. Following a crash, the
> value is restored to the last one logged + 1000. (I think this can be a
> problem if we log one acquisition, then write some tuples, and then
> crash, without flushing the acquisition logged. Maybe a solution is to
> force a flush after logging an acquisition.)
>
Does Oid have a similar problem?
Regards,
Qingqing