Tomas Vondra <tomas.vondra@xxxxxxxxxxxxxxx> writes: > No. now() calls GetCurrentTransactionStartTimestamp(), so it does not > call gettimeofday() and so the clock source overhead is pretty much > irrelevant. Moreover it's marked as 'stable' which makes repeated calls > unnecessary. Yeah. My own thought, in view of the large version jump involved, is that there's been some change in the planning of semi-joins that isn't working well here. But since the OP hasn't provided EXPLAIN output for the problem case, table schemas, or indeed any of the details suggested in https://wiki.postgresql.org/wiki/Slow_Query_Questions it's hard to provide any concrete answers. 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
