October 2008
Beginner to intermediate
1024 pages
31h 30m
English
Content preview from Programming Microsoft® SQL Server™ 2008Become 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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SNAPSHOT Isolation
For working with T-SQL transactions, SQL Server 2005 introduced a new isolation level called SNAPSHOT that allows you to work in a mode in which writers don’t block readers. Readers thus read from a previously committed version of the data they request, rather than being blocked during write transactions. SNAPSHOT isolation works by SQL Server maintaining a linked list in tempdb that tracks changes to rows and constructs an older, committed version of data for readers to access. This isolation level is useful for optimistic locking, in which UPDATE conflicts are uncommon. For example, if process 1 retrieves data and later attempts to modify it, and if process 2 has modified the same data between the retrieval and modification ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.