November 2013
Intermediate to advanced
982 pages
34h 23m
English
book
Microsoft SQL Server 2012 Internals
by Bob Beauchemin Kalen Delaney Conor Cunningham, Jonathan Kehayias, Benjamin Nevarez, and Paul S. Randal
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Row versioning
Early on, this chapter described two concurrency models that SQL Server can use. Pessimistic concurrency uses locking to guarantee the appropriate transactional behavior and avoid problems such as dirty reads, according to the isolation level you’re using. Optimistic concurrency uses a technology called row versioning to guarantee your transactions. Starting with SQL Server 2005, optimistic concurrency is available after you enable one or both of the database properties READ_COMMITTED_SNAPSHOT and ALLOW_SNAPSHOT_ ISOLATION. Exclusive locks can be acquired when you use optimistic concurrency, so you still need to be aware of all issues related to lock modes, lock resources, and lock duration, as well as the resources required to ...
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.