Craig James wrote:
Oracle is simply not better than Postgres in this regard. As far as I
know, there is only one specific situation (discussed frequently here)
where Oracle is faster: the count(), min() and max() functions, and I
know significant progress has been made since I started using
Postgres. I have not found any other query where Oracle is
significantly better, and I've found several where Postgres is the
clear winner.
In my testing between a commercial database that cannot be named and
postgresql, I found max() / min() to be basically the same, even with
where clauses and joins happening.
count(*), OTOH, is a still a clear winner for the big commercial
database. With smaller sets (1 Million or so) both dbs are in the same
ballpark.
With 30+million rows, count(*) took 2 minutes on pgsql and 4 seconds on
the big database.
OTOH, there are some things, like importing data, which are MUCH faster
in pgsql than in the big database.
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