データベース毎の容量

SELECT
    table_schema                                         AS "データベース名"
  , FLOOR(SUM(data_length + index_length) / 1024 / 1024) AS "合計容量(MB)"
FROM information_schema.tables
GROUP BY
    table_schema
ORDER BY
    SUM(data_length + index_length) DESC
;

+-----------------------+------------------+
| データベース名        | 合計容量(MB)     |
+-----------------------+------------------+
| xxxxxxxx_xxxxxxxx     |             1995 |
| information_schema    |                0 |
+-----------------------+------------------+

テーブル毎の容量

use DATABASE_NAMEで確認したいデータベースに切り替えた後に実行。

SELECT
    table_name                                        AS "テーブル名"
  , FLOOR((data_length + index_length) / 1024 / 1024) AS "合計容量(MB)"
  , FLOOR((data_length) / 1024 / 1024)                AS "データ容量(MB)"
  , FLOOR((index_length) / 1024 / 1024)               AS "インデックス容量(MB)"
  , table_rows                                        AS "行数"
  , avg_row_length                                    AS "平均行容量"
  , engine                                            AS "ストレージエンジン"
FROM information_schema.tables
WHERE table_schema = database()
ORDER BY
    (data_length + index_length) DESC
;

+-------------------+------------------+---------------------+------------------------------+----------+-----------------+-----------------------------+
| テーブル名        | 合計容量(MB)     | データ容量(MB)      | インデックス容量(MB)         | 行数     | 平均行容量      | ストレージエンジン          |
+-------------------+------------------+---------------------+------------------------------+----------+-----------------+-----------------------------+
| aaa               |             1781 |                1132 |                          649 | 10340935 |             114 | InnoDB                      |
| bbb               |               99 |                  42 |                           56 |   842684 |              52 | InnoDB                      |
| ccc               |               53 |                  50 |                            3 |    97275 |             545 | InnoDB                      |
| ddd               |               48 |                  34 |                           13 |   614400 |              58 | InnoDB                      |
| eee               |               12 |                   5 |                            6 |    84417 |              68 | InnoDB                      |
| fff               |                1 |                   0 |                            0 |     7083 |              53 | InnoDB                      |
| ggg               |                0 |                   0 |                            0 |     2598 |              63 | InnoDB                      |
| hhh               |                0 |                   0 |                            0 |     1543 |              63 | InnoDB                      |
| iii               |                0 |                   0 |                            0 |      233 |              70 | InnoDB                      |
| jjj               |                0 |                   0 |                            0 |      233 |              70 | InnoDB                      |
| kkk               |                0 |                   0 |                            0 |       69 |             237 | InnoDB                      |
| lll               |                0 |                   0 |                            0 |      265 |              61 | InnoDB                      |
| mmm               |                0 |                   0 |                            0 |        1 |           16384 | InnoDB                      |
+-------------------+------------------+---------------------+------------------------------+----------+-----------------+-----------------------------+