Andreas Joseph Krogh <andreas(at)visena(dot)com> writes:
> I have this "dequeue" query which is working:
>
> select qe.entity_id, qe.queue_id, qe.sequence_id, qe.tx_id , qe.payload_string
> fromorigo_queue_entry qe WHERE qe.queue_id = 2 AND pg_try_advisory_xact_lock(
> sequence_id) LIMIT 1 FOR UPDATE ;
> I'm not sure is this is guaranteed to lock in ASC-order on column sequence_id,
> is it?
No. You could possibly do SELECT...ORDER BY...FOR UPDATE in a
subquery and do the pg_try_advisory_xact_lock call in the outer query.
It might take some fooling around to get a plan that doesn't lock
more rows than necessary; EXPLAIN is your friend.
regards, tom lane