When real-time or embedded systems use a database, it is very important that client applications can quickly know when data had changed. Of course, one could use an external event mechanism - but this puts the onus on those updating the database to broadcast the fact that they have just changed a particular table, and those interested in the table will then have to go and refresh their query. Polyhedra's Active Queries™ offer a scalable, low-latency solution that automatically keeps a client application up to date without the need for special code in the application that is feeding changes into the database. There is a 3-part introduction to Active Queries on YouTube:
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