Re: High Planning Time

Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at> writes:
> Phil S wrote:
>> explain analyze
>> select * from message
>> limit 1
>>
>> "Limit (cost=0.00..0.44 rows=1 width=1517) (actual time=0.009..0.009 rows=1 loops=1)"
>> " -> Seq Scan on message (cost=0.00..28205.48 rows=64448 width=1517) (actual time=0.007..0.007
>> rows=1 loops=1)"
>> "Planning time: 3667.361 ms"
>> "Execution time: 1.652 ms"
>>
>> As you can see the query is simple and does not justify 3 seconds of planning time. It would appear
>> that there is an issue with my configuration but I am not able to find anything that looks out of
>> sorts in the query planning configuration variables. Any advice about what I should be looking for to
>> fix this would be appreciated.

> This is odd.
> Could you profile the backend during such a statement to see where the time is spent?

I'm wondering about locks. Perhaps turning on log_lock_waits would
yield useful info.

regards, tom lane