On 11/28/2014 09:30 AM, Michael Paquier wrote:
On Thu, Nov 27, 2014 at 9:39 PM, Sameer Kumar <sameer.ku...@ashnik.com>
wrote:
Can we tweak pg_rewind to take differential backups in PostgreSQL?
I was wondering can we hack the pg_rewind code to print the details of the
file which have been modified compared to a target server. The list output
can then be used for taking differential backups.
Or perhaps we can add an option/switch in pg_rewind --action
--action=print ---> would print the files which have changed
--action=sync ---> would sync them
--action=copy ---> with this option I can specify an additional optino
--target-dir where I can copy the files which have changed
This discussion is not really adapted on hackers as pg_rewind is not
included in Postgres core code. Please let's discuss your proposal there.
Btw, pg_rewind is not aimed to be used as a tool for a backup facility. You
may find easier to use existing backup solutions instead, or help out with
an in-core solution.
It also would be quite straightforward to write a separate tool to do
just that. Would be better than conflating pg_rewind with this. You
could use pg_rewind as the basis for it - it's under the same license as
PostgreSQL.
- Heikki
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