DataStructures / System Design
What is database sharding?
A database shard is a horizontal partition of data in a database. Each individual partition is referred to as a database shard. Each shard is held on a separate database server instance, to spread the load. Some data within a database remains present in all shards,[notes 1] but some appear only in a single shard. Each shard (or server) acts as the single source for this subset of data.
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