Syntax

DROP [ONLINE|OFFLINE] INDEX [IF EXISTS] index_name ON tbl_name [algorithm_option | lock_option]

algorithm_option:
    ALGORITHM [=] {DEFAULT|INPLACE|COPY}

lock_option:
    LOCK [=] {DEFAULT|NONE|SHARED|EXCLUSIVE}

Description

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.

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.

See ALTER TABLE.

Another shortcut, 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.

IF EXISTS

MariaDB starting with 10.1.4

The IF EXISTS clause was added in MariaDB 10.1.4

When the IF EXISTS clause is used, MariaDB will return a warning instead of an error if the index does not exist.

ONLINE/OFFLINE

MariaDB starting with 10.0

The ONLINE and OFFLINE clauses have been removed in MariaDB 10.0.

Progress reporting

MariaDB starting with 5.3

Since MariaDB 5.3 this statement supports progress reporting.

See also

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