Susan Russo <russo@xxxxxxxxxxxxxxxxxx> writes: > Despite numerous efforts, we're unable to solve a severe performance limitation between Pg 7.3.2 > and Pg 8.1.4. > The query and 'explain analyze' plan below, runs in > 26.20 msec on Pg 7.3.2, and > 2463.968 ms on Pg 8.1.4, You're not getting the indexscan optimization of the LIKE clause, which is most likely due to having initdb'd the 8.1 installation in something other than C locale. You can either redo the initdb in C locale (which might be a good move to fix other inconsistencies from the 7.3 behavior you're used to) or create a varchar_pattern_ops index on the column(s) you're using LIKE with. regards, tom lane
