2019年06月14日阅读 18

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

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

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>
复制代码

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 */ ;
复制代码

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>
复制代码

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。