Execution variability - Mailing list pgsql-general

From Vincenzo Romano
Subject Execution variability
Date
Msg-id 200706272346.25339.vincenzo.romano@gmail.com
Whole thread Raw
Responses Re: Execution variability
List pgsql-general
Hi all.
I understand this can be a ridiculous question for most you.

The very same query on the very same db shows very variable timings.
I'm the only one client on an unpupolated server so I'd expect a
rather constant timing.

INstead for a while the query become very slooow and the CPU reached
60 to 70% and the time needed is about 1.5 minutes0.
Again with just me on it.
Normally the same query rises the usage to a mere 5% to 7% with timing
with the tenth of a second.

I have disable both the autovacuum and the "stats_start_collector" in
the
attempt to disable possibe reasons for slow down. No luck in this.

Do you have any hint?


--
Vincenzo Romano
--
Maybe Computer will never become as intelligent as Humans.
For sure they won't ever become so stupid. [VR-1988]

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