The Ultimate Guide to High Availability with MariaDB

CREATE INDEX

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Syntax

CREATE [ONLINE|OFFLINE] [UNIQUE|FULLTEXT|SPATIAL] INDEX index_name
    [index_type]
    ON tbl_name (index_col_name,...)
    [index_option] ...

index_col_name:
    col_name [(length)] [ASC | DESC]

index_type:
    USING {BTREE | HASH | RTREE}

index_option:
    KEY_BLOCK_SIZE [=] value
  | index_type
  | WITH PARSER parser_name
  | COMMENT 'string'

Description

CREATE INDEX is mapped to an ALTER TABLE statement to create indexes. See ALTER TABLE. CREATE INDEX cannot be used to create a PRIMARY KEY; use ALTER TABLE instead.

Another shortcut, DROP INDEX, allows to remove an index.

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

As of MariaDB 5.5, a comment of up to 1024 characters is permitted with the COMMENT 'string' index option.

Index type

See Storage Engine Index Types for details on permitted index_types for each storage engine.

Examples

Creating a unique index:

CREATE UNIQUE INDEX HomePhone ON Employees(Home_Phone);

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