In my last article, I talked about the performance aspect of a scalable ETL environment. In this column, I’d like to talk about another facet of scalability: availability.

Availability hardly needs defining. An application is available if its end user is able to utilize it when expecting to be able to do so. End users and ITstaff generally agree beforehand what level of availability to expect. IT must then design and operate applications such that the service level expected is actually delivered.

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