First draft of snapshot snapshot building design document

Hi All,

On Thursday, October 11, 2012 01:02:26 AM Peter Geoghegan wrote:
> The design document [2] really just explains the problem (which is the
> need for catalog metadata at a point in time to make sense of heap
> tuples), without describing the solution that this patch offers with
> any degree of detail. Rather, [2] says "How we build snapshots is
> somewhat intricate and complicated and seems to be out of scope for
> this document", which is unsatisfactory. I look forward to reading the
> promised document that describes this mechanism in more detail.

Here's the first version of the promised document. I hope it answers most of 
the questions.

Input welcome!

Greetings,

Andres
-- Andres Freund                       http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services