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From: Alvaro Herrera <[email protected]>
To: Tom Lane <[email protected]>
To: Simon Riggs <[email protected]>
To: [email protected]
Subject: Re: log_autovacuum
Date: Tue, 17 Apr 2007 21:45:27 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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Alvaro Herrera wrote:

> Seems fair.  Updated patch attached.
> 
> If there are no further comments, I'll add some docs and apply it later.

If autovacuum_vacuum_cost_delay is set to 20, my pitiful desktop system
takes 8.4 seconds to analyze a 8000 page table:

DEBUG:  "bar": scanned 3000 of 8811 pages, containing 681000 live rows and 0 dead rows; 3000 rows in sample, 2000097 estimated total rows
LOG:  automatic analyze of table "alvherre.public.bar" system usage: CPU 0.00s/0.01u sec elapsed 8.39 sec

So I guess logging on ANALYZE is not that removed from reality.

I also think we should remove these DEBUG messages, that are now
useless:

DEBUG:  autovac: will ANALYZE bar

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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