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clustered indexes: add initial docs #4476

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clustered indexes: add initial docs
morgo Dec 22, 2020
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morgo authored Dec 24, 2020
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Expand Up @@ -5,7 +5,7 @@ summary: Learn how clustered indexes apply to TiDB.

# Clustered Indexes

The clustered index is an experimental feature introduced in TiDB 5.0-rc. This document provides multiple examples to explain how this feature makes a difference to the query performance of TiDB. To enable this feature and see the detailed operation guide, see [tidb_enable_clustered_index](/system-variables.md#tidb_enable_clustered_index-).
The clustered index is an experimental feature introduced in TiDB 5.0-rc. This document provides multiple examples to explain how this feature makes a difference to the query performance of TiDB. To enable this feature and see the detailed operation guide, see [tidb_enable_clustered_index](/system-variables.md#tidb_enable_clustered_index--new-in-v50).

Clustered indexes provide TiDB the ability to organize tables in a way that can improve the performance of certain queries. The term _clustered_ in this context refers to the _organization of how data is stored_ and not _a group of database servers working together_. Some database management systems refer to clustered indexes as _index-organized tables_ (IOT).

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