June 2015
Intermediate to advanced
1800 pages
70h 6m
English
book
Microsoft SQL Server 2014 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
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Using Application Locks
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 for the resource you are locking, a mode, an optional lock owner, and an optional lock timeout interval. The syntax for sp_getapplock is as follows:
sp_getapplock [ @Resource = ] 'resource_name', [ @LockMode = ] ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.