October 2003
Intermediate to advanced
1072 pages
24h 21m
English
Content preview from Guru's Guide to SQL Server Architecture and Internals, TheBecome 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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Transaction Isolation Levels
SQL Server supports four TILs. As mentioned earlier, a transaction's isolation level controls how it impacts and is impacted by other transactions. The trade-off is always one of data consistency versus concurrency. Selecting a more restrictive TIL increases data consistency at the expense of accessibility. Selecting a less restrictive TIL increases concurrency at the expense of data consistency. The trick is to balance these opposing interests so that the needs of your application are met.
Use the SET TRANSACTION ISOLATION LEVEL command to set a transaction's isolation level. Valid TILs include READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, and SERIALIZABLE.
READ UNCOMMITTED
Specifying READ UNCOMMITTED is essentially ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
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.