Fall 2015
We will continue our discussion of parallel and distributed query processing. You should read:

This paper discusses distributed transactions, addressing the problem of providing ACID-style semantics in a shared nothing environment.

As you read the paper, consider the following questions:

  1. How does the two phase commit (2PC) protocol work? What problem does it solve? What are the costs of using it?
  2. What is the significance of the Presumed Abort/Presumed Commit variants of 2PC? How do they reduce the overhead of 2PC? When should you choose one over the other?
Last change: 4/04/13.

Questions or comments regarding 6.830/6.814? Send e-mail to the 6.830/6.814 staff at .