On Mon, Jan 3, 2011 at 2:48 PM, Kurt Westerfeld <kwesterfeld@xxxxxxxxxx> wrote: > I have a JDBC-based application which passes date/time parameters using JDBC > query parameters, which is performing very badly (ie. doing full table > scans). In an effort to try to narrow down the problem, I am taking the > query and running it in interactive SQL mode, but changing the date > parameters (which are BETWEEN ? and ? clauses) and placing a date literal > instead, using the "date '2011-01-01' syntax. When I do this, the query > runs instantly, obviously using indices on the tables involved. Try using PREPARE to simulate your issue. We ran into a similar issue using PHP and prepared statements, where the plan choices were occasionally abysmal depending what the filters were and their relative distributions within the table. http://www.postgresql.org/docs/current/interactive/sql-prepare.html -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
