Defining MySQL Table Indexes

The following properties are applicable to a MySQL table index.

Tab	Property	Description	Additional Information
Members	Column	Specifies the columns that are included in the index Specifies the expressions for multivalued indexes
	Length	Specifies the prefix length of the column
	Sort Order	Specifies the order in which index values are stored
	Column/ Expression	Specifies the cast expression for a multivalued index	Available for only multivalued indexes
Options	Category	Specifies the index category	Fulltext: Indicates that the indexing happens over the entire column Spatial: Indicates that the indexing happens over the spatial columns
	Algorithm	Specifies the algorithm used to perform table copying operations	Default: Indicates that the operations only modify metadata in the data dictionary Inplace: Indicates that the operations do not copy table data but may rebuild the table Copy: Indicates that the operations are performed on a copy of original table
	Type	Specifies the index type to be used
	Lock option	Specifies the concurrency level for reading and writing table	Default: Indicates the maximum level of concurrency for a given algorithm None:Indicates that concurrent reads and writes are permitted Shared: Indicates that concurrent reads are permitted but not concurrent writes Exclusive: Indicates that exclusive access is enforced
	Parser Name	Specifies the fulltext parser name	Available for only fulltext indexes
	Key Block Size	Specifies the size (in bytes) of index key blocks in the storage engine	Available for MyISAM tables
	Visibility	Specifies the index visibility	Visible: Indicates that the index is used by the optimizer Invisible: Indicates that the index is not used by the optimizer