Hi all.
The following query returns and locks 1 row as expected (only one row in pg_locks with locktype='advisory' and objid=sequence_id):
begin;
select qe.entity_id, qe.version, qe.queue_id, qe.sequence_id, qe.tx_id
from origo_queue_entry qe
WHERE
qe.queue_id = (SELECT q.entity_id FROM origo_queue q WHERE q.name = 'EMAIL_IMPORT_STORE')
AND pg_try_advisory_xact_lock(sequence_id)
ORDER BY qe.sequence_id ASC
LIMIT 1 FOR UPDATE
;
But when JOIN'ing with origo_queue instead of using a sub-query:
begin;
select qe.entity_id, qe.version, qe.queue_id, qe.sequence_id, qe.tx_id
from origo_queue_entry qe JOIN origo_queue q ON q.entity_id = qe.queue_id
WHERE
q.name = 'EMAIL_IMPORT_STORE'
AND pg_try_advisory_xact_lock(sequence_id)
ORDER BY qe.sequence_id ASC
LIMIT 1 FOR UPDATE
;
it returns 1 row, but locks all of them; pg_locks is now full af advisory-locks for all "sequence_id" in origo_queue_entry
Is this by design?
Thanks.
--
Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
