Finding out largest tables on MySQL

select-tables-size.sql

SELECT CONCAT(table_schema, '.', table_name), \
       CONCAT(ROUND(table_rows / 1000000, 2), 'M')                                    rows, \
       CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2), 'G')                    DATA, \
       CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G')                   idx, \
       CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G') total_size, \
       ROUND(index_length / data_length, 2)                                           idxfrac \
FROM   information_schema.TABLES \
ORDER  BY data_length + index_length DESC \
LIMIT  10;