> I'd suggest to increase the value up to ~80MB, if not for the system, > may be just for the session running this query. > Then see if performance improved. Don't forget you can do this for the given query without affecting the other queries - just do something like SET work_mem = 128M and then run the query - it should work fine. This is great for testing and to set environment for special users (batch processes etc.). regards Tomas -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance