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SQL Server Query Performance Tuning,Fourth Edition by Grant Fritchey

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CHAPTER 20

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Blocking and Blocked Processes

You would ideally like your database application to scale linearly with the number of database users and the volume of data. However, it is common to find that performance degrades as the number of users increases and as the volume of data grows. One cause for degradation, especially associated with ever-increasing scale, is blocking. In fact, database blocking is usually one of the biggest enemies of scalability for database applications.

In this chapter, I cover the following topics:

  • The fundamentals of blocking in SQL Server
  • The ACID properties of a transactional database
  • Database lock granularity, ...

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