Re: RFC: CRC datatype

O
> > Always remember that a psotgres data base on the harddisk can be
> > manipulated accidentally / maliciously without postgres even running.
> > These are the cases where you need row level CRCs.
>
> "There is no security without physical security."  If somebody can
> change the row contents, they can also change the row and/or block
> checksum to match.

They may, but in a proper setup they won't be able to access the CRC log 
files. That way, you can still detect alterations. I presume anyway that most 
alterations would be rather accidental than malicious, and in that case the 
CRC is extremely helpful

Horst