Re: Proposal: Incremental Backup

Il 07/08/14 17:25, Bruce Momjian ha scritto:
> On Thu, Aug  7, 2014 at 08:35:53PM +0900, Michael Paquier wrote:
>> On Thu, Aug 7, 2014 at 8:11 PM, Fujii Masao <masao.fujii@gmail.com> wrote:
>>> There are some data which don't have LSN, for example, postgresql.conf.
>>> When such data has been modified since last backup, they also need to
>>> be included in incremental backup? Probably yes.
>> Definitely yes. That's as well the case of paths like pg_clog,
>> pg_subtrans and pg_twophase.
>
> I assumed these would be unconditionally backed up during an incremental
> backup because they relatively small and you don't want to make a mistake.
>

You could decide to always copy files which doesn't have LSN, but you
don't know what the user could put inside PGDATA. I would avoid any
assumption on files which are not owned by Postgres.

With the current full backup procedure they are backed up, so I think
that having them backed up with a rsync-like algorithm is what an user
would expect for an incremental backup.

Regards,
Marco

--
Marco Nenciarini - 2ndQuadrant Italy
PostgreSQL Training, Services and Support
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