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What is Replication?

Database replication is the process of copying and synchronizing data from one database to one or more additional databases. The copies are called replicas.

Distributed systems replicate for three reasons: the data survives the loss of a machine (availability), the system keeps answering when one copy is unreachable (fault tolerance), and reads can be spread across the copies instead of all landing on one server (scalability).

The Usual Shape

Most database systems replicate using a primary-replica relationship between the original and the copies.

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J

Jimmy

· 3 years ago

Synchronous and Asynchronous writes from the primary DB to the replica 2 DB should be labeled as "Write on Replica 2" instead of "Write on Replica 1".

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