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Re: Largeobject Access Controls (r2460)

From: Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>
To: KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Largeobject Access Controls (r2460)
Date: 2009-12-11 08:34:11
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com> wrote:

> >>   We have to reference pg_largeobject_metadata to check whether a certain
> >>   large objct exists, or not.
> It is a case when we create a new large object, but write nothing.

OK, that makes sense.

In addition of the patch, we also need to fix pg_restore with
--clean option. I added DropBlobIfExists() in pg_backup_db.c.

A revised patch attached. Please check further mistakes.

BTW, we can optimize lo_truncate because we allow metadata-only large
objects. inv_truncate() doesn't have to update the first data tuple to
be zero length. It only has to delete all corresponding tuples like as:
    DELETE FROM pg_largeobject WHERE loid = {obj_desc->id}

Takahiro Itagaki
NTT Open Source Software Center

Attachment: pgsql-blob-priv-fix_v2.patch
Description: application/octet-stream (8.0 KB)

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