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Event-driven Systems

Integrating databases with pub/sub

DB world: continuous queries require recording of individual queries and individual response, one-to-one.

instead, Event-Based world: databases advertise events

-  event type (<attribute-type>)

e.g.“cars-for-sale(maker, model, colour, automatic?, …)”

     advertised by many databases e.g. in the Cambridge area

clients subscribe and are notified of occurrences

the pub/sub service does the filtering – not the database

we have used PostgreSQL – active predicate store

Event-driven Systems

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