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* un-'vacuum analyse'
@ 2006-03-31 16:02 Frederic Back <fredericback@gmail.com>
2006-03-31 16:27 ` Re: un-'vacuum analyse' Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: Frederic Back @ 2006-03-31 16:02 UTC (permalink / raw)
To: pgsql-performance
Hello,
I would like to know how my application works before
and after data from VACUUM ANALYSE is available.
Is there a way to de-'vacuum analyse' a database for
testing purposes?
Thank you,
Fred
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: un-'vacuum analyse'
2006-03-31 16:02 un-'vacuum analyse' Frederic Back <fredericback@gmail.com>
@ 2006-03-31 16:27 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2006-03-31 16:27 UTC (permalink / raw)
To: Frederic Back <fredericback@gmail.com>; +Cc: pgsql-performance
Frederic Back <fredericback@gmail.com> writes:
> Is there a way to de-'vacuum analyse' a database for
> testing purposes?
"DELETE FROM pg_statistic" will get you most of the way there.
It doesn't get rid of the accurate relpages/reltuples entries
in pg_class, but since CREATE INDEX also updates those counts,
I think it's reasonable to consider that a freshly loaded database
would normally have correct counts.
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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2006-03-31 16:02 un-'vacuum analyse' Frederic Back <fredericback@gmail.com>
2006-03-31 16:27 ` Tom Lane <tgl@sss.pgh.pa.us>
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