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SQL Server Tips by Burleson |
The Impact of Availability
How does availability impact the performance model? The best way to
grasp this concept is to delve into several different
availability-related situations and examine their impact on the
performance model.
Of course, the first situation to consider is what happens when the
database server suddenly goes down. The impact of this situation is
fairly easy to assess. When the availability suddenly drops to zero,
the peak efficiency of the database would be at zero as well.
While database server accessibility components have the potential to
cause a sudden, catastrophic drop in the peak efficiency model,
other components can crash a system just as easily, but the end of
the story will not be quite as abrupt. One case to consider could
involve lock contention, one of the building blocks of resource
availability.
The above book excerpt is from:
High-Performance SQL Server DBA
Tuning & Optimization Secrets
ISBN:
0-9761573-6-5
Robin Schumacher
http://www.rampant-books.com/book_2005_2_sql_server_dba.htm |
