MySQL: UNIQUE constraint without index

Question

Is it possible to add a restriction like

ALTER TABLE `t1` ADD UNIQUE(`col1`, `col2`);

without creating an index? The index will not be used for any queries, so it will be a waste of space.

It would not be a problem if inserts and updates are slower, because the table is not updated very often.

Answer 1

No, It is Immpossible. A UNIQUE constraint contains the definition of an index, and I can barely imagine how it can be implemented without creating an index (in a DBMS).

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