1.首先进入information_schema 数据库（存放了其他的数据库的信息）
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mysql> use information_schema;Database changed
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2.查看大小
（1）查看所有数据库大小
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mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES;
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结果：
（2）查看指定数据库大小
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mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='CarData';
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结果
（3）查看指定数据库的指定表单的大小
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mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='CarData' and table_name='driver020294';
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结果
查看指定数据库指定表单的其他大小：
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mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data_size,
-> concat(round(sum(MAX_DATA_LENGTH/1024/1024),2),'MB') as max_data_size,
-> concat(round(sum(INDEX_LENGTH/1024/1024),2),'MB') as index_size,
-> concat(round(sum(DATA_FREE/1024/1024),2),'MB') as data_free
-> from TABLES where table_schema='CarData' and table_name='driver020294';
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结果：
注：第一步也可以不用使用数据库，直接像下面这样写;
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mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data_size,
-> concat(round(sum(MAX_DATA_LENGTH/1024/1024),2),'MB') as max_data_size,
-> concat(round(sum(INDEX_LENGTH/1024/1024),2),'MB') as index_size,
-> concat(round(sum(DATA_FREE/1024/1024),2),'MB') as data_free
-> from INFORMATION_SCHEMA.TABLES where table_schema='CarData' and table_name='driver020294';
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结果是一样的：