On Mon, Jun 30, 2014 at 5:36 PM, AI Rumman <rummandba@xxxxxxxxx> wrote: > I see lots of similar log message at a certain time in a day on Postgresql > 9,.1: > > LOG: process 18855 still waiting for ShareLock on transaction 2856146023 > after 1001.209 ms > STATEMENT: UPDATE table1 SET time = $1 WHERE id = $2 > > The table1 size is 17 G. > > What could be the reason for this lock contention? > autovacuum? > > Please give some idea. Query pg_stat_activity and pg_locks on intervals and you'll get to the bottom of this. merlin
