Re: CRCs

On Fri, Jan 12, 2001 at 11:30:30PM -0500, Tom Lane wrote:
> >> AFAICS, disk-block CRCs do not guard against mishaps involving intended
> >> writes.  They will help guard against data corruption that might creep
> >> in due to outside factors, however.
> 
> > Right.  
> 
> Given that we seem to have agreed on that, I withdraw my complaint about
> disk-block-CRC not being in there for 7.1.  I think we are still a ways
> away from the point where externally-induced corruption is a major share
> of our failure rate ;-).  7.2 or so will be time enough to add this
> feature, and I'd really rather not force another initdb for 7.1.

More to the point, putting CRCs on data blocks might have unintended
consequences for dump or vacuum processes.  7.1 is a monumental 
accomplishment even without corruption detection, and the sooner
the world has it, the better.

Nathan Myers
ncm@zembu.com