June 2014
Intermediate to advanced
804 pages
22h 17m
English
Content preview from Pro SQL Server Internals
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CHAPTER 23
Schema Locks
SQL Server uses schema locks to ensure that the database schema is consistent during the query execution, for example, to prevent table alteration while other queries are accessing the table. Exclusive (X) table lock will not help here because in a READ UNCOMMITTED transaction isolation level, readers do not acquire intent shared (IS) table locks. This is the reason SQL Server introduces two other lock types: schema stability (Sch-S) and schema modification (Sch-M).
In this chapter, we will discuss schema locks in depth. We will also talk about low-priority locks, which are introduced in SQL Server 2014 to improve the ...
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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.