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DROP INDEX index_name ON tbl_name
DROP INDEX drops the index named
index_name from the table
tbl_name. This statement is mapped to
an ALTER TABLE statement to drop
the index. See Section 13.1.4, “ALTER TABLE Syntax”.
To drop a primary key, the index name is always
PRIMARY, which must be specified as a quoted
identifier because PRIMARY is a reserved word:
DROP INDEX `PRIMARY` ON t;
How long would you expect a drop index to take?Think again!It can easily run into tens of minutes if not hours!!(on innodb, at least), during which time other operation can be impacted. So use with care on live production servers!