Re: finding changed blocks using WAL scanning

On Mon, Apr 22, 2019 at 01:15:49PM -0400, Bruce Momjian wrote:
>On Mon, Apr 22, 2019 at 01:11:22PM -0400, Robert Haas wrote:
>> On Mon, Apr 22, 2019 at 12:35 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>> > I assumed the modblock files would be stored in the WAL archive so some
>> > external tools could generate incremental backups using just the WAL
>> > files. I assumed they would also be sent to standby servers so
>> > incremental backups could be done on standby servers too.
>>
>> Yeah, that's another possible approach. I am not sure what is best.
>
>I am thinking you need to allow any of these, and putting the WAL files
>in pg_wal and having them streamed and archived gives that flexibility.
>

I agree - this would be quite useful for the prefetching use case I've
already mentioned in my previous message.

regards

--
Tomas Vondra http://www.2ndQuadrant.com
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