Tech Jargon of the Day: shard

A database shard is a horizontal partition in a database or search engine. Each individual partition is referred to as a shard or database shard.

Horizontal partitioning is a database design principle whereby rows of a database table are held separately, rather than being split into columns (which is what normalization and vertical partitioning do, to differing extents). Each partition forms part of a shard, which may in turn be located on a separate database server or physical location.

source: Shard (database architecture)

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