Susan Russo <[EMAIL PROTECTED]> 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

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