Data concurrency

This tutorial will introduce you to the concept of data consistency and to the various mechanisms that are used by DB2 Universal Database to maintain database consistency in both single- and multi-user environments. In this tutorial, you will learn:

--What data consistency is
--What transactions are and how they are initiated and terminated
--How transactions are isolated from each other in a multi-user environment
--How DB2 Universal Database provides concurrency control through the use of locks
--What types of locks are available and how locks are acquired
--What factors influence locking
(PDF)