March 2009
Intermediate to advanced
784 pages
30h 30m
English
book
Microsoft® SQL Server® 2008 Internals
by Paul Randal Kalen Delaney Kimberly Tripp, and Conor Cunningham
Content preview from Microsoft® SQL Server® 2008 InternalsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Locking
Locking is a crucial function of any multiuser database system, including SQL Server. Locks are applied in both the pessimistic and optimistic concurrency models, although the way other processes deal with locked data is different in each. The reason I refer to the pessimistic variation of Read Committed isolation as Read Committed (locking) is because locking allows concurrent transactions to maintain consistency. In the pessimistic model, writers always block readers and writers, and readers can block writers. In the optimistic model, the only blocking that occurs is that writers block other writers. But to really understand what these simplified behavior summaries mean, we need to look at the details of SQL Server locking.
Locking Basics ...
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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.