PFC writes:
- If you process up to some percentage of your RAM worth of data, hashing is going to be a lot faster
Thanks for the excellent breakdown and explanation. I will try and get sizes of the tables in question and how much memory the machines have.
- If you need DISTINCT ON, well, you're stuck with the Sort - So, for the time being, you can replace DISTINCT with GROUP BY...
Have seen a few of those already on some code (new job..) so for those it is a matter of having a good disk subsystem?
-- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance