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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Transaction Isolation Levels in SQL Server

Isolation levels determine the extent to which data being accessed or modified in one transaction is protected from changes to the data by other transactions. In theory, each transaction should be fully isolated from other transactions. However, in practice, for practical and performance reasons, this might not always be the case. In a concurrent environment in the absence of locking and isolation, the following four scenarios can happen:

Lost update—In this scenario, no isolation is provided to a transaction from other transactions. Multiple transactions can read the same copy of data and modify it. The last transaction to modify the data set prevails, and the changes by all other transactions are ...

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Publisher Resources

ISBN: 9780768696585Purchase book