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Pro SQL Server Internals, Second Edition by Dmitri Korotkevitch

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© Dmitri Korotkevitch 2016

Dmitri Korotkevitch, Pro SQL Server Internals, 10.1007/978-1-4842-1964-5_32

32. High Availability Technologies

Dmitri Korotkevitch

(1)Tampa, Florida, USA

A High Availability (HA) strategy helps improve the availability of the system due to hardware, software, or network malfunctions. Even though it sounds similar to a backup and Disaster Recovery (DR) strategy, it is not the same. A High Availability strategy serves as the first level of defense, making a hardware failure or software crash transparent to users. Disaster recovery, on the other hand, deals with situations where a system needs to be recovered after a disaster that was not prevented by the High Availability strategy in use.

Think about a situation in which ...

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