| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Cc: | Ulrich Wisser <ulrich(dot)wisser(at)relevanttraffic(dot)se> |
| Subject: | Re: Need for speed |
| Date: | 2005-08-17 17:28:04 |
| Message-ID: | 200508171028.05028.josh@agliodbs.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Ulrich,
> I believe the biggest problem is disc io. Reports for very recent data
> are quite fast, these are used very often and therefor already in the
> cache. But reports can contain (and regulary do) very old data. In that
> case the whole system slows down. To me this sounds like the recent data
> is flushed out of the cache and now all data for all queries has to be
> fetched from disc.
How large is the database on disk?
> My machine has 2GB memory, please find postgresql.conf below.
hmmmm ...
effective_cache_size?
random_page_cost?
cpu_tuple_cost?
etc.
--
Josh Berkus
Aglio Database Solutions
San Francisco
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Ron | 2005-08-17 18:00:14 | Re: Need for speed |
| Previous Message | Chris Hoover | 2005-08-17 17:17:33 | Re: Tuning Effective Cache Question |