MySQL EXPLAIN

sql

EXPLAIN SELECT * FROM users WHERE email = 'a@example.com';

Explanation

Check the selected key, rows estimate, and extras such as filesort or temporary operations.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

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See actual runtime, loops, and buffer reads.

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Check keys examined and docs examined.

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Inspect scans versus indexed searches.

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A quick review checklist after creating an index.