mysql> use information_schema;
Database changed
mysql> select data_length,index_length
from tables where
table_schema='your_database'
and table_name = 'your_table';
+-------------+--------------+
| data_length | index_length |
+-------------+--------------+
| 166379520 | 235782144 |
+-------------+--------------+
row in set (0.02 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='your_database'
and table_name = 'your_table';
+----------------+-----------------+
| data_length_MB | index_length_MB |
+----------------+-----------------+
| 158.67MB | 224.86MB |
+----------------+-----------------+
row in set (0.03 sec)

show variables like '%quer%';

log-slow-queries = C:/Program Files/MySQL/MySQL Server 5.1/log/mysql-slow.log
long_query_time = 3

-- 第一种 先创建表再拷贝数据CREATE TABLE `id_interface_call_url_bak20180508` (  `interface_id` bigint(30) NOT NULL AUTO_INCREMENT,  `interface_call_url` varchar(200) DEFAULT NULL,  `inner_interface_call` int(1) DEFAULT NULL COMMENT '是否接口内部调用：0：否；1：是',  `send_request_msg` varchar(500) DEFAULT NULL,  `desc_call` varchar(50) DEFAULT NULL,  PRIMARY KEY (`interface_id`)) ENGINE=InnoDB AUTO_INCREMENT=300001 DEFAULT CHARSET=utf8;INSERT INTO id_interface_call_url_bak20180508 SELECT * FROM id_interface_call_url;

-- 第二种直接从原来创建表，缺点是主键等信息丢失CREATE TABLE id_interface_call_url_bak AS SELECT * FROM id_interface_call_url;

-- 第三种CREATE  TABLE IF NOT EXISTS tb_base_like2 (LIKE id_user_info_level);INSERT INTO tb_base_like2 SELECT * FROM id_user_info_level;

SELECT @@tx_isolation

set transaction isolation level  read uncommitted;

1）read uncommitted : 读取尚未提交的数据 ：哪个问题都不能解决
2）read committed：读取已经提交的数据 ：可以解决脏读 ---- oracle默认的
3）repeatable read：重读读取：可以解决脏读 和 不可重复读 ---mysql默认的
4）serializable：串行化：可以解决 脏读 不可重复读 和 虚读---相当于锁表

start transaction;commit;rollback;