Horton

Re: pg_upgrade and statistics

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>, Peter Eisentraut <peter_e@gmx.net>, Daniel Farina <daniel@heroku.com>, Greg Stark <stark@mit.edu>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2012-03-14T00:34:00Z
Lists: pgsql-hackers 
On Tue, Mar 13, 2012 at 08:30:17PM -0400, Tom Lane wrote:
> Bruce Momjian <bruce@momjian.us> writes:
> > Another idea is to just copy over pg_statistic like we copy of
> > pg_largeobject now, and force autovacuum to run.
> 
> That would be an automatic crash in a 9.1 to 9.2 migration, as well as
> any other release where we changed the column layout of pg_statistic.

It might be a solution for cases where we don't modify it.  I frankly am
worried that if we copy over statistics even in ASCII that don't match
what the server expects, it might lead to a crash, which has me back to
wanting to speed up vacuumdb.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

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