3. Azure Cosmos DB Geo-Replication

Availability of the database is of utmost importance to any application’s experience. In cases in which the user engagement is critical, and the availability of the database in data-driven application is most important, one must ensure the availability and scalability of the database. Among examples of data-driven applications problems could be the following: an e-commerce application with a plethora of easy-to-use and marquee features going down every time a user tries to make a purchase, because something in the database is not available; a billing solution for a hospital that leaves patients standing in line to make payments, owing to a database instance not being available; or a transport company with footprints across the globe seeking to access the system, but apart from that at the main location, the system performs badly, owing to latency issues. So, how do you ensure that a database is available? How do you ensure that the database is always deployed nearest to the relevant application? And how do you achieve the lowest possible latency?