He's not asking for anything. He's pointing out how a different data model allows for solving a different set of problems. The MVCC page on Wikipedia might give

He's not asking for anything. He's pointing out how a different data model allows for solving a different set of problems. The MVCC page on Wikipedia might give you a better background so that you're able to contrast the two models and determine for yourself where they are useful: http://en.wikipedia.org/wiki/Multiversion_concurrency_control http://en.wikipedia.org/wiki/Multiversion_concurrency_contro...