On Wed, Jan 19, 2005 at 14:59:17 -0000, Mark Cave-Ayland <[EMAIL PROTECTED]> wrote: > BEGIN; > INSERT INTO person (first_name, .... Tel) VALUES ('Fred', .... > '12345'); > INSERT INTO person_count(id) VALUES (currval('id_seq')); > COMMIT; > > > So then I would use SELECT COUNT(*) FROM person_count whenever I wanted to > know the current number of person records. How much quicker would a COUNT(*) > be if visibility were included in the indices as opposed to a "hacked" > approach like this?
You are only going to get a constant factor speed up unless the space savings allows much better use of cache. You probably want to look at using triggers to maintain counts in another table. ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly