On Tue, Apr 1, 2008 at 12:44 AM, mark <
markkicks@gmail.com> wrote:
On 2008-03-31 21:16, mark wrote:
> is the query I am running , and it takes over 10 seconds to complete
> this query...
> update users set number_recieved=number_recieved+1 where
> uid=738889333;
Every time or only sometimes?
i checked again, and it seems to be only sometimes.. and during these times there are lot of other queries too running which I can see from pg_stat_activity;
Upgrade to 8.3 will help as checkpoint writing algorithms were optimized
there for lots of RAM.
I already am running 8.3.1 [ i mentioned in subject]. I am having the default settings for those. can you pl. share the settings for check points:
current settings all default
#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 5min # range 30s-1h
#checkpoint_completion_target = 0.5 # checkpoint target duration, 0.0 - 1.0
#checkpoint_warning = 30s # 0 is off
this is what I have on pg_stat_bgwriter ; how much should I increase checkpoint_segment & checkpoint_completion_target to? thanks a lot!
postgres=# select * from pg_stat_bgwriter;
checkpoints_timed | checkpoints_req | buffers_checkpoint | buffers_clean | maxwritten_clean | buffers_backend | buffers_alloc
-------------------+-----------------+--------------------+---------------+------------------+-----------------+---------------
42 | 1051 | 8035125 | 21954 | 42 | 241519 | 10394696