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Re: pg_upgrade and statistics

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Daniel Farina <daniel(at)heroku(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_upgrade and statistics
Date: 2012-03-13 14:14:43
Message-ID: 20120313141443.GJ10441@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
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, but I am
unclear if we assume a last_vacuum included an analyze;  I think you
need to look at autovacuum.c for the details;  let me know if you need
help.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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