[GENERAL] Wildly erratic query performance

2008-10-31 Thread Eric Schwarzenbach
I've got a particular query that is giving me ridiculously erratic query performance. I have the SQL in a pgadmin query window, and from one execution to another, with no changes, the time it takes varies from half a second to, well, at least 10 minutes or so at which point I give up an cancel the

Re: [GENERAL] Wildly erratic query performance

2008-10-31 Thread Dann Corbit
-Original Message- From: [EMAIL PROTECTED] [mailto:pgsql-general- [EMAIL PROTECTED] On Behalf Of Eric Schwarzenbach Sent: Friday, October 31, 2008 12:35 PM To: pgsql-general@postgresql.org Subject: [GENERAL] Wildly erratic query performance I've got a particular query

Re: [GENERAL] Wildly erratic query performance

2008-10-31 Thread Scott Marlowe
On Fri, Oct 31, 2008 at 1:34 PM, Eric Schwarzenbach [EMAIL PROTECTED] wrote: I've got a particular query that is giving me ridiculously erratic query performance. I have the SQL in a pgadmin query window, and from one execution to another, with no changes, the time it takes varies from SNIP

Re: [GENERAL] Wildly erratic query performance

2008-10-31 Thread Tom Lane
Scott Marlowe [EMAIL PROTECTED] writes: On Fri, Oct 31, 2008 at 1:34 PM, Eric Schwarzenbach [EMAIL PROTECTED] wrote: This is postgreslq 8.3, on Windows XP. The query joins about 17 tables (without an explicit JOIN, just using the WHERE criteria) with a few OK, whether you use join syntax or

Re: [GENERAL] Wildly erratic query performance

2008-10-31 Thread Dennis Brakhane
On Fri, Oct 31, 2008 at 04:36:02PM -0400, Eric Schwarzenbach wrote: As I explained already (no pun intended) running the query using EXPLAIN makes the wild variation go away. So I cannot get explain results for a fast and for a slow execution. EXPLAIN only determines and outputs the query

Re: [GENERAL] Wildly erratic query performance

2008-10-31 Thread Eric Schwarzenbach
, but it would certainly answer my question. Eric Dann Corbit wrote: -Original Message- From: [EMAIL PROTECTED] [mailto:pgsql-general- [EMAIL PROTECTED] On Behalf Of Eric Schwarzenbach Sent: Friday, October 31, 2008 12:35 PM To: pgsql-general@postgresql.org Subject: [GENERAL] Wildly erratic query