Detour

We interrupt our regular programming to bring you this special report.

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it is DB which is usually The Bottleneck™ – it means that we’re saving this enormous amount of load, exactly where it really matters.

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as discussed above, the real-world task is always about scaling the whole system, including database; and in this regard Stateless-App-based systems exhibit significant problems.

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to make an efficient representation usable for OLAP – we need to modify our data on its way to OLAP replicas

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Each of the DB Server Apps is a replica master, but all replica targets are within the same Replica DB

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Then you can recover from any single server failure in a perfectly transparent manner

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after the program fails in production, we can get the input log and run it in the comfort of a developer’s machine, under a debugger, as many times as we want, and get exactly the same variables at exactly the same points as happened in production