Hiroshi Inoue <Inoue@tpf.co.jp> writes:
> Hmm is there any place setting proc->xmin other than
> the following ?
> [in storage/ipc/sinval.c]
> if (serializable)
> MyProc->xmin = snapshot->xmin;
AFAICT that's the only place that sets it. It's cleared to zero during
transaction commit or abort in xact.c.
regards, tom lane