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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

Using Application Locks

The SQL Server Lock Manager knows nothing about the object or the structure of the object it is locking. The Lock Manager simply checks whether two processes are trying to obtain incompatible locks on the same resource. If so, blocking occurs.

SQL Server allows you to extend the resources that can be locked beyond the ones automatically provided. You can define your own custom locking resources and let the Lock Manager control the access to those resources as it would for any resource in a database. This essentially allows you to choose to lock anything you want. These user-defined lock resources are called application locks. To define an application lock, you use the sp_getapplock stored procedure and specify a name ...

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Publisher Resources

ISBN: 9780768696585Purchase book