ITM 820 Final: ITM820 Exam Prep.docx
Document Summary
Acid (atomicity, consistency, isolation, durability) is a set of properties that guarantee that database transactions are processed reliably. four primary attributes ensured to any transaction by a transaction manager (which is also called a transaction monitor): atomicity. In a transaction involving two or more discrete pieces of information, either all of the pieces are committed or none are: consistency. A transaction either creates a new and valid state of data, or, if any failure occurs, returns all data to its state before the transaction was started. A transaction in process and not yet committed must remain isolated from any other transaction: durability. Committed data is saved by the system such that, even in the event of a failure and system restart, the data is available in its correct state. grid computing - a form of networking. Distributed systems - collection of computers that act, work, and appear as one large computer. Looking at the issues that plague distributed systems: