| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Jesper Krogh <jesper(at)krogh(dot)cc> |
| Cc: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, Dimitri Fontaine <dfontaine(at)hi-media(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pg_migrator to /contrib in a later 9.0 beta |
| Date: | 2010-05-06 13:04:13 |
| Message-ID: | 201005061304.o46D4Dg29092@momjian.us |
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| Thread: | |
| Lists: | pgsql-hackers |
Jesper Krogh wrote:
> On 2010-05-06 06:41, Alvaro Herrera wrote:
> > Excerpts from Jesper Krogh's message of jue may 06 00:32:09 -0400 2010:
> >
> >
> >> Q: I read you pdf, why isn't statistics copied over? It seems to be the last
> >> part missing from doing an upgrade in a few minutes.
> >>
> > Seems fraught with peril, and a bit pointless. What's so bad about having to
> > run ANALYZE afterwards?
> >
>
> There is nothing directly "bad" about it.. but:
>
> It's just "an extra step, that might be overseen and is absolutely
> required".
>
> I should have written:
> Why isn't statistics copied over or why doesnt pg_migrator run analyze by
> itself?
>
> The database (of a reasonable size) is useless until statistics is
> available.
>
> I guess it is because pg_dump/restore doesn't do it either.
Yeah, the statistics are part of the system tables, and system tables
are fully handled by pg_dumpall --schema-only (except for statistics).
There might be changes in the system table statistics format that would
break if pg_migrator tried to migrate the statistics. Right now
pg_migrator is immune from any system table changes, and I would like to
keep it that way.
And if pg_migrator ran analyze itself, it would greatly increase its
great migration times!
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
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