Alter a live table to make a key non-unique

Question

I saw some other questions related to this, but they were not MySQL.

The database is a live database, so I don\'t want to delete and recreate the table. I simply wan

Answer 1

Just DROP the unique index. There shouldn't be a problem with the fact that it is a live DB. If it is a really large table, you may block some queries temporarily while the index is removed. But that should only happen if you were adding an index.

ALTER TABLE table_name DROP INDEX index_name;