On Aug 5, 2015, at 7:56 AM, John Scalia <jayknowsunix@xxxxxxxxx> wrote: > > SELECT > c.relname, > pg_size_pretty(count(*) * 8192) as buffered, > round(100.0 * count(*) / > (SELECT setting FROM pg_settings > WHERE name='shared_buffers')::integer,1) > AS buffers_percent, > round(100.0 * count(*) * 8192 / > pg_relation_size(c.oid),1) > AS percent_of_relation > FROM pg_class c > INNER JOIN pg_buffercache b > ON b.relfilenode = c.relfilenode > INNER JOIN pg_database d > ON (b.reldatabase = d.oid AND d.datname = current_database()) > GROUP BY c.oid,c.relname > ORDER BY 3 DESC > LIMIT 25; So, the first thing I would do is change: > round(100.0 * count(*) / > (SELECT setting FROM pg_settings > WHERE name='shared_buffers')::integer,1) to: > (SELECT setting FROM pg_settings > WHERE name='shared_buffers')::integer,1) and change: > round(100.0 * count(*) * 8192 / > pg_relation_size(c.oid),1) to: > pg_relation_size(c.oid),1) Then look for 0s in those output columns. I'll bet that the 9.4 vs 9.2 difference is simply a value of 0 for one of those, not some exotic thing about the query plan. If I'm right about that, then you can start hunting down a specific explanation. -- Scott Ribe scott_ribe@xxxxxxxxxxxxxxxx http://www.elevated-dev.com/ https://www.linkedin.com/in/scottribe/ (303) 722-0567 voice -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
