On Sat, Dec 4, 2010 at 13:56, Mathieu De Zutter <math...@dezutter.org> wrote:
> I have no idea why in some cases the index scan is not considered.
> Does anyone have an idea?
I guess that it's because the currval() function is volatile -- its
value has to be tested for again each row.
Try this instead:
SELECT user_id FROM log_event WHERE id = (SELECT CURRVAL('log_event_id_seq'));
This will assure that there's only one call to currval().
Regards,
Marti
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
