Re: Overload after some minutes, please help!

On Thu, Oct 19, 2006 at 01:57:56PM +0200, Peter Bauer wrote:
In the update statement, don't wrap the ID values in quotes. At best
it's extra work; at worse it will fool the planner into not using the
index.

> shared_buffers = 1000 # min 16 or max_connections*2, 8KB each

This is *way* too small for what you're trying to do. Try a minimum of
10% of memory, and 50% of memory may be a better idea.

> #temp_buffers = 1000 # min 100, 8KB each
> #max_prepared_transactions = 5 # can be 0 or more
> # note: increasing max_prepared_transactions costs ~600 bytes of shared memory
> # per transaction slot, plus lock space (see max_locks_per_transaction).
> work_mem = 20480 # min 64, size in KB,

Making that active might help a lot, but beware of running the machine
out of memory...

> #max_fsm_pages = 20000 # min max_fsm_relations*16, 6 bytes each

Probably needs to get increased.

> #bgwriter_delay = 200 # 10-10000 milliseconds between rounds
> #bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers scanned/round
> #bgwriter_lru_maxpages = 5 # 0-1000 buffers max written/round
> #bgwriter_all_percent = 0.333 # 0-100% of all buffers scanned/round
> #bgwriter_all_maxpages = 5 # 0-1000 buffers max written/round

The background writer might need to be tuned more aggressively.

> #checkpoint_warning = 30 # in seconds, 0 is off

I'd set that closer to 300 to make sure you're not checkpointing a lot,
though keep in mind that will impact failover time.

> effective_cache_size = 44800 # typically 8KB each

The machine only has 1/2G of memory?

> #autovacuum_naptime = 60 # time between autovacuum runs, in secs

I'd drop that to 30.

> #autovacuum_vacuum_threshold = 1000 # min # of tuple updates before
> # vacuum
> #autovacuum_analyze_threshold = 500 # min # of tuple updates before
> # analyze
> #autovacuum_vacuum_scale_factor = 0.4 # fraction of rel size before
> # vacuum
> #autovacuum_analyze_scale_factor = 0.2 # fraction of rel size before
> # analyze

I'd cut the above 4 in half.

--
Jim Nasby jim(at)nasby(dot)net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)