mysql

查看所以库大小
select TABLE_SCHEMA, concat(truncate(sum(data_length)/1024/1024,2),' MB') as data_size,

concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size

from information_schema.tables

group by TABLE_SCHEMA

order by data_length desc;

查询 表结构
show create tables tablename
查询视图结构
show create view viem.name
查询数据库中的存储过程和函数

   select `name` from mysql.proc where db = 'xx' and `type` = 'PROCEDURE'   //存储过程
   select `name` from mysql.proc where db = 'xx' and `type` = 'FUNCTION'   //函数

   show procedure status; //存储过程
   show function status;     //函数

查看存储过程或函数的创建代码

　　show create procedure proc_name;
　　show create function func_name;

查看视图
　　SELECT from information_schema.VIEWS //视图
　　SELECT from information_schema.TABLES //表

查看触发器
　　SHOW TRIGGERS [FROM db_name] [LIKE expr]
　　SELECT * FROM triggers T WHERE trigger_name=”mytrigger” \G