Re: [HACKERS] fault tolerance...

2002-03-19 Thread Christopher Quinn
Tom Lane wrote: > Christopher Quinn <[EMAIL PROTECTED]> writes: > > > The WAL log uses per-record CRCs plus sequence numbers (both per-record > and per-page) as a way of determining where valid information stops. > I don't see any need for relying on a "root

[HACKERS] fault tolerance...

2002-03-19 Thread Christopher Quinn
Hello, I've been wondering how pgsql goes about guaranteeing data integrity in the face of soft failures. In particular whether it uses an alternative to the double root block technique - which is writing, as a final indication of the validity of new log records, to alternate disk blocks at