From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | Claudio Freire <klaussfreire(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Marco Nenciarini <marco(dot)nenciarini(at)2ndquadrant(dot)it>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Proposal: Incremental Backup |
Date: | 2014-07-25 22:38:07 |
Message-ID: | 53D2DC4F.4040303@agliodbs.com |
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Thread: | |
Lists: | pgsql-hackers |
On 07/25/2014 11:49 AM, Claudio Freire wrote:
>> I agree with much of that. However, I'd question whether we can
>> > really seriously expect to rely on file modification times for
>> > critical data-integrity operations. I wouldn't like it if somebody
>> > ran ntpdate to fix the time while the base backup was running, and it
>> > set the time backward, and the next differential backup consequently
>> > omitted some blocks that had been modified during the base backup.
> I was thinking the same. But that timestamp could be saved on the file
> itself, or some other catalog, like a "trusted metadata" implemented
> by pg itself, and it could be an LSN range instead of a timestamp
> really.
What about requiring checksums to be on instead, and checking the
file-level checksums? Hmmm, wait, do we have file-level checksums? Or
just page-level?
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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