On Thu, 2002-11-28 at 21:23, Tom Lane wrote: > wade <[EMAIL PROTECTED]> writes: > > Explain output can be found at http://arch.wavefire.com/72v73a.txt > > The difference evidently is that 7.3 chooses a mergejoin where 7.2 > picks a hashjoin.
I was looking at this a bit in IRC, and I was more concerned by the fact that 7.3 was 20% than 7.2 on the same hardware, when they both used the same query plan (consider the data at the end of the URL above, after the execution of 'SET enable_mergejoin = off;'). Also, is it expected that the cardinality estimates for join steps won't be very accurate, right? (estimated: 19 rows, actual: 765 rows) Cheers, Neil -- Neil Conway <[EMAIL PROTECTED]> || PGP Key ID: DB3C29FC ---------------------------(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
