Tobias Brox wrote:
I did test "select id from table order by id desc limit 1" on my parent table yesterday, it would still do the seq-scan. Even adding a where-restriction to make sure only one partition was queried I still got the seq-scan.
Right; you actually have to direct the query toward the specific partition by name, nothing run against the parent table will work. The new logic for 9.1 essentially splits the query into this alternate form, runs it against every partition individually, then combines the results. If you can afford to wait for 9.1, that is certainly the easy path here. It just works out of the box in that version.
-- Greg Smith 2ndQuadrant US greg@xxxxxxxxxxxxxxx Baltimore, MD PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us "PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
