> is the exact query... i think it will be removed later today because
> is a bad query anyway... but my fear is that something like happens
> even with good ones...
>
> maybe chekpoints could be the problem?
> i have 8.3.5 and condigured checkpoint_timeout in 15 minutes,
> chekpoint_segments 6 and checkpoint_completion_target to 0.5
Well, it might help if you could provide the query, and the EXPLAIN output.
Unless the query is updating data (rather than just retrieving it),
checkpoints shouldn't be involved (I think).
...Robert