November 2013
Intermediate to advanced
982 pages
34h 23m
English
book
Microsoft SQL Server 2012 Internals
by Bob Beauchemin Kalen Delaney Conor Cunningham, Jonathan Kehayias, Benjamin Nevarez, and Paul S. Randal
Content preview from Microsoft SQL Server 2012 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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Chapter 13. Transactions and concurrency
Kalen Delaney
Concurrency can be defined as the ability of multiple processes to access or change shared data at the same time. The greater the number of concurrent user processes that can be active without interfering with each other, the greater the concurrency of the database system.
Concurrency is reduced when a process that’s changing data prevents other processes from reading that data or when a process that’s reading data prevents other processes from changing that data. This chapter uses the terms reading and accessing to describe the impact of using a SELECT statement on your data. Concurrency is also affected when multiple processes attempt to change the same data simultaneously, but they can’t ...
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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.