How to achieve certain system quantities with the help ofhardwareRegions, availability zones, data centers, racks, serversA example :US Start up -> a web application -> deploy a single general-purpose server in the garage; it accepts HTTP requests all over the world and store the data in the database (in the same machine);As the app grows and the data and request increase, you find single server are not enough to store data(CPU bound, memory bound and IO bound), a more powerful machine is pricy, so you bought another machine -> for database dedicated ;One day your dog accidentally turned off t
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