Re: Query timing increased from 3s to 55s when used as a function instead of select

In response to Tyler Hildebrandt :
> 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.
>
> select * from fn_medirota_get_staff_leave_summary(6);
> Time: 57375.477 ms

I think, your problem is here:

SELECT INTO current_user * FROM
fn_medirota_validate_rota_master(in_currentuser);

The planner has no knowledge about how many rows this functions returns
if he don't know the actual parameter. Because of this, this query
enforce a seq-scan. Try to rewrite that to something like:

execute 'select * from fn_medirota_validate_rota_master(' ||
in_currentuser' || ')' into current_user

*untested*

HTH, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99