| From: | Marco Nenciarini <marco(dot)nenciarini(at)2ndquadrant(dot)it> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Gabriele Bartolini <gabriele(dot)bartolini(at)2ndquadrant(dot)it>, desmodemone <desmodemone(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Proposal: Incremental Backup |
| Date: | 2014-08-07 16:00:27 |
| Message-ID: | 53E3A29B.2080906@2ndquadrant.it |
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| Lists: | pgsql-hackers |
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(dot)fujii(at)gmail(dot)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
marco(dot)nenciarini(at)2ndQuadrant(dot)it | www.2ndQuadrant.it
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