Re: slow database

On Wed, 2004-02-11 at 09:23, alemon(at)tiago(dot)hazor(dot)com(dot)br wrote:
> my data base is very slow. The machine is a processor Xeon 2GB with
> 256 MB of RAM DDR. My archive of configuration is this:

I'm not surprised. New values below old.

> sort_mem = 131072 # min 64, size in KB

sort_mem = 8192.

> fsync = false

Are you aware of the potential for data corruption during a hardware,
power or software failure?

> enable_seqscan = false
> enable_indexscan = false
> enable_tidscan = false
> enable_sort = false
> enable_nestloop = false
> enable_mergejoin = false
> enable_hashjoin = false

You want all of these set to true, not false.

> effective_cache_size = 170000 # typically 8KB each

effective_cache_size = 16384.

> random_page_cost = 1000000000 # units are one sequential page fetch cost

random_page_cost = 3

> cpu_tuple_cost = 0.3 # (same)

cpu_tuple_cost = 0.01

> cpu_index_tuple_cost = 0.6 # (same)

cpu_index_tuple_cost = 0.001

> cpu_operator_cost = 0.7 # (same)

cpu_operator_cost = 0.0025

> default_statistics_target = 1 # range 1-1000

default_statistics_target = 10