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