查整个库的状态：

select concat(truncate(sum(data_length)/1024/1024,2),'MB') as data_size,

          concat(truncate(sum(max_data_length)/1024/1024,2),'MB') as max_data_size,

          concat(truncate(sum(data_free)/1024/1024,2),'MB') as data_free,

          concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size

  from information_schema.tables

where TABLE_SCHEMA = 'databasename';

查单表：

select concat(truncate(sum(data_length)/1024/1024,2),'MB') as data_size,

          concat(truncate(sum(max_data_length)/1024/1024,2),'MB') as max_data_size,

          concat(truncate(sum(data_free)/1024/1024,2),'MB') as data_free,

          concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size

  from information_schema.tables

where TABLE_NAME = 'tablename';

 

SELECT table_name,

data_length / 1024 / 1024 AS data_size,

index_length / 1024 / 1024 AS index_size

FROM tables

order by data_size desc limit 20;