Steve Kehlet <steve.kehlet@xxxxxxxxx> writes: > This is Postgres 9.4.4. I am troubleshooting some occasional (every 3-4 > hours) slowness with UPDATEs on a table that has a GIN index on a JSONB > column. During these episodes, UPDATEs that normally take < 1sec take > upwards of 2-4 minutes, and all finish simultaneously, like they were all > blocked on something and finally got released. Hm ... have you tried checking pg_locks to see if they're blocked on something identifiable? You might be right that this is caused by flushing the GIN pending list, but I thought that that was not supposed to block concurrent insertions. What I'd expect to see is *one* insert taking significantly longer than normal, but no effect on concurrent operations. Also, 2-4 minutes sounds much longer than should be needed to flush a 10MB pending list, anyway. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
