I'm using gentoo as well, I'm having performance issues as the number of partitions is increasing I imagine do due to overhead managing them and figuring out where to put each insert/update. I'm switching to weekly partitions instead of daily. I believe in PG8.2 constraint exclusion works with updates/deletes also so I'm eager to upgrade. I get about 1 million records per day in two tables each, each record updated about 4 times within 30 minutes.
Do you think using UTF8 vs US-ASCII hurts performance signficantly, some of my smaller tables require unicode, and I don't think you can have some tables be unicode and some be ASCII.
On 12/10/06, Daniel van Ham Colchete <daniel.colchete@gmail.com> wrote: Hi Gene,
at my postgresql.conf, the only non-comented lines are:
fsync = off
lc_messages = 'C'
lc_monetary = 'C'
lc_numeric = 'C'
lc_time = 'C'
max_connections = 100
shared_buffers = 5000
temp_buffers = 1000
work_mem = 4096
The only two values I changed are shared_buffers and work_mem.
*** BUT ***
I'm using Gentoo Linux, so all my libraries (including glibc that is
very important to PostgreSQL), and all my softwares are compiled with
good CFLAG options to my processor ("-O2 march=athlon-xp (...)"). My
Linux is not an Intel-AMD binary compatible turtle like
Fedora/RedHat/SUSE/... It's really important to have your GLIBC
compiled for your processor. It is essencial for performance.
I can't imagine anyone buying a $1k-dollar quad-core XEON and using an
i585 compatible distro that doesn't even know what the fudge is
SSE/SSE2/vectorized instructions.
Best regards,
Daniel Colchete
On 12/10/06, Gene <genekhart@gmail.com> wrote:
> I have a similar type application, I'm partitioning using constraint
> exclusion so queries only have to look at a few tables. I've found that
> there is some overhead to using partitioning so you should test to see how
> many partitions you want to create. Could I check out you postgresql.conf
> parameters to compare? thanks
>
>
> Gene Hart
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Gene Hart
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