Kai Sellgren <kaisellgren 'at' gmail.com> writes: > Hi, > > I'm experiecing slow count performance: > > SELECT COUNT(*) AS "count" > FROM "NewsArticle" > > Takes 210 ms. I've run analyze and vacuum. I'm on 9.3. Here're the stats http:/ > /d.pr/i/6YoB > > I don't understand why is it that slow. It returns 1 integer, and counts > without filters. You might actually have a lot more dead tuples than reported in statistic. Last vacuum is old according to your screenshot. Try "VACUUM FULL ANALYZE" on your table, then try again counting. > This performs quickly: > > SELECT reltuples AS count > FROM pg_class > WHERE relname = 'NewsArticle'; This is not the same. This one uses precomputed statistics, and doesn't scan the actual table data. > But I'd like to add conditions so I don't like the last method. > > > -- > Yours sincerely, > Kai Sellgren -- Guillaume Cottenceau -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
