I've just copied a database from one linux machine to another.
Fast machine is CentOS 5.5, running postgres 9.0.0 64 bit
Slow machine is Red Hat 5.5 running postgres 9.0.2 64 bit.
Here's the query:
explain analyze select sentenceid from sentences where sentenceid = any
( array(select
I have a query which seems to be taking an extraordinarily long time
(many minutes, at least) when seemingly equivalent queries have
different plans and execute in seconds. naturally, I'd like to know why.
Version is Postgresql 8.4.8. The table, t, is
Column | Type | Modifiers
On Tue, Jul 5, 2011 at 1:50 PM, Matthias Howell
matthias.how...@voxco.comwrote:
I've just copied a database from one linux machine to another.
Fast machine is CentOS 5.5, running postgres 9.0.0 64 bit
** **
Slow machine is Red Hat 5.5 running postgres 9.0.2 64 bit.
** **
Any help, please?
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From: Samuel Gendler [mailto:sgend...@ideasculptor.com]
Sent: Wednesday, July 06, 2011 3:43 AM
To: Matthias Howell
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Query in 9.0.2 not using index in 9.0.0 works
fine
On Tue, Jul 5, 2011 at 1:50 PM, Matthias Howell
Dne 6.7.2011 15:30, bakkiya napsal(a):
Any help, please?
According to the EXPLAIN ANALYZE output (please, don't post it to the
mailing list directly - use something like explain.depesz.com, I've done
that for you this time: http://explain.depesz.com/s/HMN), you're doing a
UNIQUE over a lot of
On Wed, Jul 6, 2011 at 5:50 AM, Matthias Howell
matthias.how...@voxco.comwrote:
However, in the end, it was user brain damage.
** **
It does use the doc id index for the subquery, but for some reason, the
primary key on sentences - the sentenceid - was not set. So in fact, there
is
On Wed, Jul 6, 2011 at 1:04 PM, Tomas Vondra t...@fuzzy.cz wrote:
Dne 6.7.2011 15:30, bakkiya napsal(a):
Any help, please?
According to the EXPLAIN ANALYZE output (please, don't post it to the
mailing list directly - use something like explain.depesz.com, I've done
that for you this time:
On 7/07/2011 3:04 AM, Tomas Vondra wrote:
That is done by sorting the data, and sorting is very CPU intensive task
usually. So the fact that the CPU is 100% utilized is kind of expected
in this case. So that's a feature, not a bug.
In general each process is hitting some bottleneck. It might be
