Phil S wrote: > I am running Postgresql on a Windows Server 2008 server. I have noticed that queries have very high > planning times now and then. Planning times go down for the same query immediately after the query > runs the first time, but then go up again after if the query is not re-run for 5 minutes or so. > > I am not able to find any specific information in the documentation that would explain the issue or > explains how to address it, so am asking for advice here. > > Here is an example. > > 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? Yours, Laurenz Albe -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
