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Do aggregate-oriented NoSQL databases have advantages for implementing Real Time BI?

I am reading a book called "NoSQL distilled" by Martin Fowler and he writes: Aggregates can also be used to obtain analytics; for example, an aggregate update may fill in information on which ...
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streaming data in memory aggregation

We have a stream of data we're aggregating stats over and putting into a python dictionary (sent from kafka). Every X time interval, We update our database with these aggregated metrics. This ...