On 21/05/2010 9:54 PM, Tyler Hildebrandt wrote:
We're using a function that when run as a select statement outside of the function takes roughly 1.5s to complete whereas running an identical query within a function is taking around 55s to complete. We are lost as to why placing this query within a function as opposed to substituting the variables in a select statement is so drastically different.
This is a frequently asked question. It's the same issue as with prepared queries, where the planner has to pick a more general plan when it doesn't know the value of a parameter. The short answer is "work around it by using EXECUTE ... USING to invoke your query dynamically".
( Oddly, this FAQ doesn't seem to be on the FAQ list at http://wiki.postgresql.org/wiki/FAQ )
-- Craig Ringer -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
