Обсуждение: MVCC? Where?

Can someone point out where MVCC is implemented on the backend?  I would
like to Use The Source to understand what's going on, but I can't seem
to find it!  `grep -i MVCC` turns up two comments, neither of which
seems near the implementation.  I would be more than happy to write up a
tourist's guide to the implementation of MVCC if some kind hacker would
bless me with some pointers as to how it all fits in.

TIA!

--
Todd Graham Lewis            32�49'N,83�36'W          (800) 719-4664, x2804
******Linux******         MindSpring Enterprises      tlewis@mindspring.net

"A pint of sweat will save a gallon of blood."          -- George S. Patton