Finding the biggest MySQL tables

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;
+-------------------------------------+--------+--------+--------+------------+---------+
| concat(table_schema,'.',table_name) | rows   | data   | idx    | total_size | idxfrac |
+-------------------------------------+--------+--------+--------+------------+---------+
| art87.link_out87                    | 37.25M | 14.83G | 14.17G | 29.00G     |    0.96 |
| art87.article87                     | 12.67M | 15.83G | 4.79G  | 20.62G     |    0.30 |
| art116.article116                   | 10.49M | 12.52G | 3.65G  | 16.18G     |    0.29 |
| art84.article84                     | 10.10M | 10.11G | 3.59G  | 13.70G     |    0.35 |
| art104.link_out104                  | 23.66M | 6.63G  | 6.55G  | 13.18G     |    0.99 |
| art118.article118                   | 7.06M  | 10.49G | 2.68G  | 13.17G     |    0.26 |
| art106.article106                   | 9.86M  | 10.19G | 2.76G  | 12.95G     |    0.27 |
| art85.article85                     | 6.20M  | 9.82G  | 2.51G  | 12.33G     |    0.26 |
| art91.article91                     | 8.66M  | 9.17G  | 2.66G  | 11.83G     |    0.29 |
| art94.article94                     | 5.21M  | 10.10G | 1.69G  | 11.79G     |    0.17 |
+-------------------------------------+--------+--------+--------+------------+---------+
10 rows in set (2 min 29.19 sec)

http://www.mysqlperformanceblog.com/2008/02/04/finding-out-largest-tables-on-mysql-server/