Re: Multiversion concurrency control algorithm

>> I am looking for simple implmentations of multiversion cuncurrency
control algorithms like two phase locking or time stamp ordering. <<

1. Look up some of Jim Gray's old papers. He did some of the first work in this area. He also edits a series for Morgan-Kaufmann on database which has a few books on transaction theory.
2. I do not know if you can find anything, but years ago UNIVAC was experimenting with logical cuncurrency control algorithms. The idea was that if jobs #1 and #2 do not touch the same data, they can both be running at the same time without any concurrrency control overhead at all. Eventually, however, you could get stuck in a "mono-processing" situation.