July 2012
Intermediate to advanced
478 pages
10h 3m
English
Content preview from Microsoft SQL Server 2012 Performance Tuning CookbookBecome 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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Using NOLOCK table query hint
As you may know, SQL Server uses different kinds of locks on resources belonging to the requested data and objects, to manage and maintain data consistency and data concurrency. By default, SQL Server acquires a shared lock on the resources when a SELECT query is executed. The resources can be anything from a table, to a range of keys, or single row. So, when we execute a SELECT query, the SQL Server tries to acquire a shared lock on the requested resources. However, if another transaction is updating the same data and has acquired the UPDATE locks on the same resource, the SELECT query that tries to acquire a SHARED lock on the resources may have to wait until another transaction is completed, based on the transaction ...
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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.