DROP INDEX [IF EXISTS] index_name ON tbl_name [WAIT n |NOWAIT]
DROP INDEX drops the index named
index_name from the table
This statement is mapped to an
ALTER TABLE statement to drop the
If another connection is using the table, a metadata lock is active, and this statement will wait until the lock is released. This is also true for non-transactional tables.
CREATE INDEX, allows the creation of an index.
To remove the primary key,
`PRIMARY` must be specified as index_name. Note that the quotes are necessary, because
PRIMARY is a keyword.
DROP INDEX statement requires the
INDEX privilege for the table or the database.
Online DDL is used by default with InnoDB, when the drop index operation supports it.
DROP INDEX IF EXISTS ...
IF EXISTS clause is used, then MariaDB will return a warning instead of an error if the index does not exist.
MariaDB provides progress reporting for
DROP INDEX statement for clients
that support the new progress reporting protocol. For example, if you were using the
mysql client, then the progress report might look like this::