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Apache Cassandra combines the benefits of major NoSQL databases to support data management needs not covered by traditional RDBMS vendors.
Suppose you’re operating an application that receives the bulk of its traffic from the east coast of the US. You want to minimize latency by locating your database on the eastern seaboard, but it’s important that availability doesn’t suffer as a result. Even with a distributed database, if you locate your DB nodes in just one or two data centers, you’re vulnerable to an outage. You’ll need at least a majority of replicas online to serve traffic, so you’ll need nodes in at least three data centers to survive a one data center failure.
