Re: function performance vs in-line sql

Schwarz, Karl wrote:
> I am having a performance problem with a query implemented within a
> server side function. If I use an SQL client(EMS Postgres) and manually
> generate the sql query I get about 100 times performance improvement
> over using the function.
>
> I've also tried using a prepared statement from my application and
> observed a similar performance improvement over the the function.
>
> The table I am quering against has several hundred thousand records. I
> have indexes defined and I've run vacuum several times.
>
> Is there something basic I am missing here with the use of a function. I
> am no database expert, but my assumption was that a function would give
> me better results than in-line sql.
>
> I've seen a mailing list entry in another list that implied that the
> query planner for a function behaves differently than in-line sql.

For starters, can you show us the function, the manual sql query and the
schema, please?

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com