How can you check whether a MySQL query is making use of a Covering Index?

StackOverflow https://stackoverflow.com/questions/16223395

  •  13-04-2022
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Question

How can you check whether a MySQL query is making use of a Covering Index and getting all the data it needs solely from that Index?

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Solution

For an index only scan (covering index) MySQL shows 'Using index' in the Extra column.

http://use-the-index-luke.com/sql/explain-plan/mysql/operations

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