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Re: pg_upgrade and statistics

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: Daniel Farina <daniel(at)heroku(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_upgrade and statistics
Date: 2012-03-13 14:34:16
Message-ID: 1331649152-sup-3424@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-hackers
Excerpts from Bruce Momjian's message of mar mar 13 11:14:43 -0300 2012:
> On Tue, Mar 13, 2012 at 12:33:09AM -0700, Daniel Farina wrote:
> > On Mon, Mar 12, 2012 at 8:10 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > > To answer your specific question, I think clearing the last analyzed
> > > fields should cause autovacuum to run on analyze those tables.  What I
> > > don't know is whether not clearing the last vacuum datetime will cause
> > > the table not to be analyzed.
> > 
> > Thank you very much for this reference.  I will look into it.
> 
> I assume a missing last_analyze would trigger an auto-analyze,

You're wrong.  Autovacuum does not consider time, only dead/live tuple
counts.  The formulas it uses are in the autovacuum docs; some details
(such as the fact that it skips tables that do not have stat entries)
might be missing.

-- 
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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