Hello i have big table 80mln records, ~6GB data, 2columns (int, int) if query select count(col1) from tab where col2=1234; return low records (1-10) time is good 30-40ms but when records is >1000 time is >12s How to increse performace ? my postgresql.conf shared_buffers = 810MB temp_buffers = 128MB work_mem = 512MB maintenance_work_mem = 256MB max_stack_depth = 7MB effective_cache_size = 800MB db 8.3.7 server, atlon dual-core 2,0Ghz, 2GB RAM, SATA -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general