On 16.04.2008, at 01:24, PFC wrote:
The queries in question (select's) occasionally take up to 5 mins
even if they take ~2-3 sec under "normal" conditions, there are no
sequencial scans done in those queries. There are not many users
connected (around 3, maybe) to this database usually since it's
still in a testing phase. I tried to hunt down the problem by
playing around with resource usage cfg options but it didn't really
made a difference.
Could that be caused by a CHECKPOINT ?
actually there are a few log (around 12 per day) entries concerning
checkpoints:
LOG: checkpoints are occurring too frequently (10 seconds apart)
HINT: Consider increasing the configuration parameter
"checkpoint_segments".
But wouldn't that only affect write performance? The main problems I'm
concerned about affect SELECT queries.
Regards,
Tom
PS: WAL settings are all set to defaults.
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