MySQL中查询所有数据库占用磁盘空间大小和单个库中所有表的大小的sql语句

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查询所有数据库占用磁盘空间大小的SQL语句：

1. select TABLE_SCHEMA, concat(truncate(sum(data_length)/1024/1024,2),' MB') as data_size,
   
2. concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size
   
3. from information_schema.tables
   
4. group by TABLE_SCHEMA
   
5. order by data_length desc;

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查询单个库中所有表磁盘占用大小的SQL语句：

1. select TABLE_NAME, concat(truncate(data_length/1024/1024,2),' MB') as data_size,
   
2. concat(truncate(index_length/1024/1024,2),' MB') as index_size
   
3. from information_schema.tables where TABLE_SCHEMA = 'TestDB'
   
4. group by TABLE_NAME
   
5. order by data_length desc;

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以上语句测试有效，注意替换以上的TestDB为数据库名