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Privacy statement — Copyright 2004-2018 Fanmail. Post your job requirements for free! Please help improve it or discuss these issues on the talk page. This article’s tone or style may not reflect the encyclopedic tone used on Wikipedia. See Wikipedia’s guide to writing better articles for suggestions. This article needs additional citations for verification. A database shard is a horizontal partition of data in a database or search engine.
Each individual partition is referred to as a shard or database shard. Some data within a database remains present in all shards, but some appears only in a single shard. There are numerous advantages to the horizontal partitioning approach. This reduces index size, which generally improves search performance. A database shard can be placed on separate hardware, and multiple shards can be placed on multiple machines.
Increased latency when querying, especially where more than one shard must be searched. Data or indexes are often only sharded one way, so that some searches are optimal, and others are slow or impossible. There is a desire to support sharding automatically, both in terms of adding code support for it, and for identifying candidates to be sharded separately. Splitting shards across multiple isolated instances requires more than simple horizontal partitioning.