MySQL统计数据库表大小

use information_schema;
SELECT
   TABLE_NAME,
    (DATA_LENGTH/1024/1024) as DataM ,
    (INDEX_LENGTH/1024/1024) as IndexM,
    ((DATA_LENGTH+INDEX_LENGTH)/1024/1024) as AllM,
    TABLE_ROWS
FROM
    TABLES
WHERE
    TABLE_SCHEMA = 'dbname' order by DataM desc;