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DROP INDEX
DROP INDEX index_name ON tbl_name
index_name
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”.
ALTER TABLE
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:
PRIMARY
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!
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User Comments
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!
Add your own comment.