Re: High load average with PostgreSQL 7.4.2 on debian/ibm eserver.

eleven(at)ludojad(dot)itpp(dot)pl wrote:

> Whole config is available here:
> http://ludojad.itpp.pl/~eleven/pg-high-load.conf

effective_cache_size = 4000 # typically 8KB each
#random_page_cost = 4 # units are one sequential page fetch cost
#cpu_tuple_cost = 0.01 # (same)
#cpu_index_tuple_cost = 0.001 # (same)
#cpu_operator_cost = 0.0025 # (same)

These values are too higher for your hardware, try to execute the
explain analyze for the queries that are running on your box and
repeat it lowering these values, I bet postgres is running seq scan
instead of an index scan.

These are the value that I use for a configuration closer to your:

effective_cache_size = 20000
random_page_cost = 2.0
cpu_tuple_cost = 0.005
cpu_index_tuple_cost = 0.0005
cpu_operator_cost = 0.0025

last question, do you use the autovacuum daemon ?
If no => you have to use it
If yes => did you apply the patch that will not fail with
big tables like yours ?

if you can post the autovacuum daemon log ( last lines ).

Regards
Gaetano Mendola