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* curious delay on view/where
@ 2004-10-28 10:16 Gary Stainburn <gary.stainburn@ringways.co.uk>
2004-10-28 14:25 ` Re: curious delay on view/where Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 3+ messages in thread
From: Gary Stainburn @ 2004-10-28 10:16 UTC (permalink / raw)
To: pgsql-sql
Hi folks.
I have the following view:
CREATE VIEW "stock_available" as
SELECT * FROM stock_details
WHERE available = true AND visible = true AND
location not in (SELECT descr FROM ignored);
Stock_details is itself a view pulling in a number of tables. Everything
works fine until I try to pull in only the details for a specific
branch, using the following.
select * from stock_available where branch = 'Leeds';
or
select * from stock_available where branch = 'Doncaster';
At this point, the query takes 11 seconds. Any other quiery, including
select * from stock_available where branch != 'Doncaster'
and
select * from stock_available where branch != 'Leeds'
which only return the equivelent of the top two (we only have Leeds and
Doncaster) are les than 1 second.
Anyone got any ideas of the cause, or thoughts on how I can trace the
problem?
--
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: curious delay on view/where
2004-10-28 10:16 curious delay on view/where Gary Stainburn <gary.stainburn@ringways.co.uk>
@ 2004-10-28 14:25 ` Tom Lane <tgl@sss.pgh.pa.us>
2004-10-28 15:01 ` Re: curious delay on view/where Gary Stainburn <gary.stainburn@ringways.co.uk>
0 siblings, 1 reply; 3+ messages in thread
From: Tom Lane @ 2004-10-28 14:25 UTC (permalink / raw)
To: Gary Stainburn <gary.stainburn@ringways.co.uk>; +Cc: pgsql-sql
Gary Stainburn <gary.stainburn@ringways.co.uk> writes:
> Anyone got any ideas of the cause, or thoughts on how I can trace the
> problem?
EXPLAIN ANALYZE results for the fast and slow cases would be
interesting. Also, have you ANALYZEd the underlying tables lately?
And what PG version is this?
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: curious delay on view/where
2004-10-28 10:16 curious delay on view/where Gary Stainburn <gary.stainburn@ringways.co.uk>
2004-10-28 14:25 ` Re: curious delay on view/where Tom Lane <tgl@sss.pgh.pa.us>
@ 2004-10-28 15:01 ` Gary Stainburn <gary.stainburn@ringways.co.uk>
0 siblings, 0 replies; 3+ messages in thread
From: Gary Stainburn @ 2004-10-28 15:01 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-sql
On Thursday 28 October 2004 3:25 pm, Tom Lane wrote:
> Gary Stainburn <gary.stainburn@ringways.co.uk> writes:
> > Anyone got any ideas of the cause, or thoughts on how I can trace
> > the problem?
>
> EXPLAIN ANALYZE results for the fast and slow cases would be
> interesting. Also, have you ANALYZEd the underlying tables lately?
> And what PG version is this?
>
> regards, tom lane
Hi Tom.
I've the analyze but don't understand what it's telling me. I've made
it available at http://www.stainburn.com/analyze.txt
Gary
--
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
^ permalink raw reply [nested|flat] 3+ messages in thread
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2004-10-28 10:16 curious delay on view/where Gary Stainburn <gary.stainburn@ringways.co.uk>
2004-10-28 14:25 ` Tom Lane <tgl@sss.pgh.pa.us>
2004-10-28 15:01 ` Gary Stainburn <gary.stainburn@ringways.co.uk>
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