Question: What is database sharding? Is a method to increase the read throughput by replicating the data into multiple DB servers and offloading the reads from

What is database sharding?
Is a method to increase the read throughput by replicating the data into multiple DB servers and offloading the reads from the primary instance.
Is a method of having multiple server working together, but managed by a single instance of a running database server.
Is a method of horizontally scaling an RDS database by using the same underlying shared storage for the DB, but having multiple instance accessing the same storage for better throughput.
Is a method to increase the write performance of a DB by splitting the data into chunks and storing in different DB servers.

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