| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Jesper Krogh <jesper(at)krogh(dot)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>, 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 15:19:27 |
| Message-ID: | 201005061519.o46FJRg21425@momjian.us |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > Jesper Krogh wrote:
> >> I should have written:
> >> Why isn't statistics copied over or why doesnt pg_migrator run analyze by
> >> itself?
>
> > 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, it's not really practical for pg_migrator to just copy over the
> statistics without any intelligence. We might at some time choose to
> teach it which stats could be copied safely, but that hardly seems like
> something to do in version 1.0 --- and anyway it could not be a 100%
> solution.
It seems copying over pg_statistic would require preservation of
pg_class.oid. Right now we only preserve pg_class.relfilenode.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
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