再谈MySQL全库备份

青衣

再谈MySQL全库备份
简介
　　Part1:写在最前
　　在很早之前，我写过一个MySQL生产库全库备份脚本，今天有同事问我是不是要再加一个-R参数来备份存储过程，理由的话是由于mysqldump --help中 关于存储过程的默认备份是false。
　　routines                          FALSE
　　

　　

　　

　　MySQL生产库全库备份脚本
http://suifu.blog.51cto.com/9167728/1758022
　　

　　

实战
　　

Part1:写在最前
　　我备份一般就三个参数
--single-transaction-A --master-data=2
　　分别是预防锁，全库备份和记录复制信息
　　

　　有人问单库怎么恢复？可以移步
　　从MySQL全库备份中恢复某个库和某张表
　　http://suifu.blog.51cto.com/9167728/1830651
　　

　　Part2:创建存储过程

[root@HE3 ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.6.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> create database helei;
Query OK, 1 row affected (0.02 sec)
mysql> use helei;
Database changed
mysql> create table helei(
  -> id int(10) unsigned NOT NULL AUTO_INCREMENT,
  -> c1 int(10) NOT NULL DEFAULT '0',
  -> c2 int(10) unsigned DEFAULT NULL,
  -> c5 int(10) unsigned NOT NULL DEFAULT '0',
  -> c3 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  -> c4 varchar(200) NOT NULL DEFAULT '',
  -> PRIMARY KEY(id),
  -> KEY idx_c1(c1),
  -> KEY idx_c2(c2)
  -> )ENGINE=InnoDB ;
Query OK, 0 rows affected (0.02 sec)
mysql> delimiter $$
mysql> drop procedure if exists `insert_helei` $$
and()*row_num),now(),repeat('su', floor(rand()*20)));
set i = i+1;
 END while;
end$$Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> create procedure `insert_helei`(in row_num int )
  -> begin
  ->  declare i int  default 0;
  ->  while i < row_num do
  -> insert into helei(c1, c2, c5,c3, c4) values( floor(rand()*row_num),floor(rand()*row_num),floor(rand()*row_num),now(),repeat('su', floor(rand()*20)));
  -> set i = i+1;
  ->  END while;
  -> 
  -> end$$
Query OK, 0 rows affected (0.00 sec)
mysql>

　　

　　Part3:执行不同的备份脚本
　　参数分别是
　　--single-transaction -A --master-data=2
　　--single-transaction -A -R  --master-data=2
　　
　　Part4:对比SQL文件
　　可以发现加了-R的文件中记录了创建存储过程的SQL语句，没加-R的没有记录。

-- Dumping routines for database 'helei'
--
/*!50003 DROP PROCEDURE IF EXISTS `insert_helei` */;
/*!50003 SET @saved_cs_client    = @@character_set_client */ ;
/*!50003 SET @saved_cs_results   = @@character_set_results */ ;
/*!50003 SET @saved_col_connection = @@collation_connection */ ;
/*!50003 SET character_set_client  = utf8 */ ;
/*!50003 SET character_set_results = utf8 */ ;
/*!50003 SET collation_connection  = utf8_general_ci */ ;
/*!50003 SET @saved_sql_mode     = @@sql_mode */ ;
/*!50003 SET sql_mode        = 'STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION' */ ;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `insert_helei`(in row_num int )
begin
 declare i int  default 0;
 while i < row_num do
insert into helei(c1, c2, c5,c3, c4) values( floor(rand()*row_num),floor(rand()*row_num),floor(rand()*row_num),now(),repeat('su', floor(rand()*20)));
set i = i+1;
 END while;
end ;;
DELIMITER ;
/*!50003 SET sql_mode        = @saved_sql_mode */ ;
/*!50003 SET character_set_client  = @saved_cs_client */ ;
/*!50003 SET character_set_results = @saved_cs_results */ ;
/*!50003 SET collation_connection  = @saved_col_connection */ ;

　　

　　

　　

验证
　　Part1:验证
　　清空linux环境，重装mysql，导入不带-R参数即不带创建存储过程SQL的备份文件

[root@HE3 ~]# mysql -uroot -p < Master_db_201612051722.sql 
Enter password: 
[root@HE3 ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 5.6.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use helei;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from helei;
Empty set (0.00 sec)
mysql> call insert_helei(5);
Query OK, 1 row affected (0.01 sec)
mysql> select * from helei;
+----+----+------+----+---------------------+------------------------------------+
| id | c1 | c2   | c5 | c3          | c4                 |
+----+----+------+----+---------------------+------------------------------------+
|  1 |  1 |  2 |  0 | 2016-12-05 17:51:37 | sususususususususususu       |
|  2 |  2 |  1 |  0 | 2016-12-05 17:51:37 | sususususususususususususususususu |
|  3 |  4 |  1 |  3 | 2016-12-05 17:51:37 | sususususususususususu       |
|  4 |  3 |  2 |  3 | 2016-12-05 17:51:37 | sususususususususususu       |
|  5 |  0 |  2 |  4 | 2016-12-05 17:51:37 | sususususususususu         |
+----+----+------+----+---------------------+------------------------------------+
5 rows in set (0.00 sec)
mysql>

　　

　　发现即便没有添加-R参数，也依然可以调用之前创建的存储过程。
　　

　　

　　

——总结——
存储过程存储在mysql.proc表中，而笔者由于采用了-A全库备份的策略，即包含mysql库，所以存储过程也得以备份。-R参数一般用于单库备份或者多库备份。由于笔者的水平有限，编写时间也很仓促，文中难免会出现一些错误或者不准确的地方，不妥之处恳请读者批评指正。