On Wed, Jul 6, 2011 at 1:04 PM, Tomas Vondra <t...@fuzzy.cz> wrote: > Dne 6.7.2011 15:30, bakkiya napsal(a): >> Any help, please? > > According to the EXPLAIN ANALYZE output (please, don't post it to the > mailing list directly - use something like explain.depesz.com, I've done > that for you this time: http://explain.depesz.com/s/HMN), you're doing a > UNIQUE over a lot of data (2 million rows, 1.5GB).
It might have been optimized lately, but generally unique is slower than group by will be. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
