一個表占用空間的大小，相當于是 數據大小 + 索引大小,

示例：

SELECT TABLE_NAME,DATA_LENGTH+INDEX_LENGTH,TABLE_ROWS FROM information_schema.TABLES WHERE TABLE_SCHEMA='hx';

+-------------------+--------------------------+------------+
| TABLE_NAME        | DATA_LENGTH+INDEX_LENGTH | TABLE_ROWS |
+-------------------+--------------------------+------------+
| enjoy_data    |                  6979584 |      70113 |
| hx_record      |                113410048 |     753279 |
| VeVb_record       |              21835546624 |  104917777 |
| tmp_day_id        |                    17326 |        811 |
+-------------------+--------------------------+------------+

2.想查看hx庫的enjoy表大小，可以使用：

SELECT DATA_LENGTH+INDEX_LENGTH,TABLE_ROWS FROM information_schema.TABLES WHERE TABLE_SCHEMA='hx' AND TABLE_NAME = 'enjoy_data';

返回：

+--------------------------+------------+
| DATA_LENGTH+INDEX_LENGTH | TABLE_ROWS |
+--------------------------+------------+
|                     6979584 |          70113 |
+--------------------------+------------+