On Fri, Nov 5, 2010 at 8:59 AM, Jonathan Hoover <jhoover@yahoo-inc.com> wrote:
> With my hard drive issues from an earlier email solved (thanks all) I am now running queries against my 65M rows. I
noticedin atop that postmaster is using 100% of just one processor core. Is there any way to tell it to use both (or at
leastsome of the other one). System is RHEL5, PG is version 8.1.18 on x86_64-redhat-linux-gnu, compiled by GCC gcc
(GCC)4.1.2 20080704 (Red Hat 4.1.2-46). Intel Core 2 Duo, 4 GB RAM.
>
> The query in question has been running for 15 minutes, and the only thing atop is reporting in the "red" is the
processor.Although, just now the proc has died down and the drive is apparently now "red" (the main delay point). Here
isthe query (any help on improving it?)
A group by is almost always faster than a distinct.
And a single query uses a single core, sorry.