September 2010
Intermediate to advanced
1704 pages
111h 8m
English
book
Microsoft® SQL Server 2008 R2 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2008 R2 Unleashed
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What Is High Availability?
The availability continuum depicted in Figure 18.1 shows a general classification of availability based on the amount of downtime an application can tolerate without impacting the business. You would write your service-level agreements (SLAs) to support and try to achieve one of these continuum categories.
Figure 18.1 Availability continuum.
Topping the chart is the category extreme availability, so named to indicate that this is the least tolerant category and is essentially a zero (or near zero) downtime requirement (that is, sustained 99.5% to 100% availability). The mythical five-nines falls at the high end of ...
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