MySQL Internals Manual  /  Tracing the Optimizer  /  Traceable Queries

8.4 Traceable Queries

They are: SELECT; INSERT or REPLACE (with VALUES or SELECT); UPDATE/DELETE and their multi-table variants; all the previous ones prefixed by EXPLAIN; SET (unless it manipulates the optimizer_trace system variable); DO; DECLARE/CASE/IF/RETURN (stored routines language elements); CALL. If one of those statements is prepared and executed in separate steps, preparation and execution are separately traced.

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