Re: 16-bit page checksums for 9.2

On 25.12.2011 15:01, Kevin Grittner wrote:
> I don't believe that.  Double-writing is a technique to avoid torn
> pages, but it requires a checksum to work.  This chicken-and-egg
> problem requires the checksum to be implemented first.

I don't think double-writes require checksums on the data pages 
themselves, just on the copies in the double-write buffers. In the 
double-write buffer, you'll need some extra information per-page anyway, 
like a relfilenode and block number that indicates which page it is in 
the buffer.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com