Re: Incremental backup

On 10/28/21 3:43 PM, Adrian Klaver wrote:
> On 10/28/21 12:23, Ron wrote:
>> On 10/28/21 2:06 PM, Adrian Klaver wrote:
>>> On 10/28/21 11:48, Ron wrote:
>>>
>>> "
>>> Logical replication is built with an architecture similar to physical
>>> streaming replication (see Section 27.2.5). It is implemented by
>>> “walsender” and “apply” processes. The walsender process starts logical
>>> decoding (described in Chapter 49) of the WAL and loads the
>>
>> Scans the (global) WAL data for only the that portion from the relevant
>> database?
>>
>> If so, definitely not the same as having per-database WAL files.
>>
>> Just as importantly, replication is not, and never will be, a substitute
>> for backups.
>
> Who says you have to use the mechanism to replicate to another database,
> why not to a file?

But WAL files store every transaction, right?  Differential and incremental
backups only send the modified pages, even if the page has been updated 1000
times.

>
> Not sure of the plausibility, still it might be interesting to find out?
>
> Also isn't a backup just an interrupted form of replication?

Highly interrupted, and usually never written back to disk in "active" form.

--
Angular momentum makes the world go 'round.