From: | Bruce Momjian <bruce(at)momjian(dot)us> |
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To: | KaiGai Kohei <kaigai(at)kaigai(dot)gr(dot)jp> |
Cc: | KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>, Greg Smith <greg(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Largeobject Access Controls and pg_migrator |
Date: | 2009-12-13 02:15:42 |
Message-ID: | 200912130215.nBD2Fgc26991@momjian.us |
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KaiGai Kohei wrote:
> lo_import() has an another prototype which takes second argument to
> specify LOID. Isn't it available to restore a large object with
> correct LOID? For example, lo_import('/etc/profile', 1234)
I can't use that because the migration has already brought over the
pg_largeobject file which has the data.
> Or, if you intend to restore metadata in the second lo_import(),
> ALTER LAEGE OBJECT and GRANT LARGE OBJECT enable to set up metadata
> of a certain large object.
Yes, that will work cleanly. The file might be large because I need a
GRANT for every large object, but I suppose that is OK.
> > You might remember that INSERT cannot set the oid of a row, so I don't
> > see how pg_migrator can migrate this? Is there a reason we used 'oid'
> > in pg_largeobject_metadata but 'lobj' in pg_largeobject? Why did't we
> > add the lomowner and lomacl columns to pg_largeobject?
>
> A large object consists of multiple tuples within pg_largeobject.
> If we added lomowner and lomacl into pg_largeobject, we have to manage
> all the pages in a large object to keep consistent state.
Ah, good point.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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