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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

Transactions and Locking

SQL Server issues and holds on to locks for the duration of a transaction to ensure the isolation and consistency of the modifications. Data modifications that occur within a transaction acquire exclusive locks, which are then held until the completion of the transaction. Shared locks, or read locks, are held for only as long as the statement needs them; usually, a shared lock is released as soon as data has been read from the resource (for example, row, page, table). You can modify the length of time a shared lock is held by using keywords such as HOLDLOCK in a query or setting the REPEATABLE_READ or SERIALIZABLE lock isolation levels. If one of these options is specified, shared locks are held until the completion ...

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Publisher Resources

ISBN: 9780768696585Purchase book