August 2018
Beginner
594 pages
22h 33m
English
Content preview from Software Architect's Handbook
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Availability
Availability describes the degree to which the software system will work as required when it is needed. It is the probability that the software system is operating properly when needed by a user and is not experiencing unplanned downtime due to failure and repair.
It is typically measured in terms of nines, as in how many nines represent the availability level (99.9%, 99.99%, or 99.999%).