July 2010
Intermediate to advanced
448 pages
12h 22m
English
Content preview from Physical Database Design
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290 CHAPTER 13 Down to the Metal: Server Resources and Topology
determine what fraction of the data is active, and use only the active proportion in the
ratio calculation.
13.9 Strategies for Availability and Recovery
Before discussing the strategies for data recovery and availability it’s worth pausing to
consider the degree to which this is at all needed. There are essentially two major sce-
narios. The first scenario concerns itself with the case that a database server fails for
any reason including hardware fault or software crash, and while that server is being
repaired we require a strategy that allows processing to continue. The second scenario
is concerned with possible geographic disaster, where entire neighborhoods or cities
can experience ...
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