MySQL查看table占用的空间大小

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// MySQL查看table占用的空间大小
// 要查询的数据库名：my_database_name，要查询的表名：my_table_name。
// 1、进入MySQL自带管理库：information_schema
// 2、查询自带库tables的属性data_length，index_length

mysql> use information_schema;
mysql> select data_length,index_length
    -> from tables
    -> where table_schema='my_database_name'
    -> and table_name='my_table_name';
+-------------+--------------+
| data_length | index_length |
+-------------+--------------+
|  2576351232 |   1873133568 |
+-------------+--------------+
1 row in set (0.00 sec)

mysql> select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,
    -> concat(round(sum(index_length/1024/1024),2),'MB') as index_length_MB
    -> from tables
    -> where table_schema='my_database_name'
    -> and table_name='my_table_name';
+----------------+-----------------+
| data_length_MB | index_length_MB |
+----------------+-----------------+
| 2457.00MB      | 1786.36MB       |
+----------------+-----------------+
1 row in set (0.00 sec)