Re: Patch for fail-back without fresh backup

On 24.10.2013 13:02, Pavan Deolasee wrote:
> Another difference AFAICS is that checksum feature needs the block to be
> backed up only after the first time a hint bit is updated after checkpoint.
> But for something like pg_rewind to work, we will need to WAL log every
> hint bit update on a page. So we would want to keep it as short as possible.

To fix that, pg_rewind could always start the rewinding process from the 
last checkpoint before the point that the histories diverge, instead of 
the exact point of divergence. That would make the rewinding more 
expensive as it needs to read through a lot more WAL, but I think it 
would still be OK.

- Heikki