Tom Lane wrote:
> Jeff Self <jself@nngov.com> writes:
> > if it's too OT, let me know, and I'll stop. The query "SELECT authuser,
> > SUM(bytes) AS traffic FROM logfile GROUP BY authuser ORDER BY traffic"
> > [is slow]
>
> What datatype are the columns used in the query? And what PG version
> are we talking about?
My guess is that is the lack of hashing for GROUP BY aggregating that is
killing us. TODO has:
* Add hash for evaluating GROUP BY aggregates
and I specifically remember MySQL has such a hash. The big question is
how many unique values are there in the group. If it is large, the
missing hashing could be the problem.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
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