再談MySQL全庫備份

簡介

Part1: 寫在最前

在很早之前，我寫過一個MySQL生産庫全庫備份腳本，今天有同僚問我是不是要再加一個-R參數來備份存儲過程，理由的話是由于mysqldump --help中 關于存儲過程的預設備份是false。

routines                          FALSE

MySQL生産庫全庫備份腳本

實戰

Part1: 寫在最前

我備份一般就三個參數

--single-transaction -A --master-data=2

分别是預防鎖，全庫備份和記錄複制資訊

有人問單庫怎麼恢複？可以移步

從MySQL全庫備份中恢複某個庫和某張表

Part2: 建立存儲過程

[[email protected] ~]# 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 $$
mysql> drop procedure if exists `×××ert_helei` $$
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 `×××ert_helei`(in row_num int )
    -> begin
    ->  declare i int  default 0;
    ->  while i < row_num do
    -> ×××ert 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: 執行不同的備份腳本

參數分别是

--single-transaction -A --master-data=2

--single-transaction -A -R  --master-data=2

Part4: 對比SQL檔案

可以發現加了-R的檔案中記錄了建立存儲過程的SQL語句，沒加-R的沒有記錄。

-- Dumping routines for database 'helei'
--
/*!50003 DROP PROCEDURE IF EXISTS `×××ert_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 `×××ert_helei`(in row_num int )
begin
 declare i int  default 0;
 while i < row_num do
×××ert 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 */ ;
           

驗證

Part1: 驗證

清空linux環境，重裝mysql，導入不帶-R參數即不帶建立存儲過程SQL的備份檔案

[[email protected] ~]# mysql -uroot -p < Master_db_201612051722.sql 
Enter password: 
[[email protected] ~]# 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 ×××ert_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>
           

發現即便沒有添加-R參數，也依然可以調用之前建立的存儲過程。

——總結 ——

存儲過程存儲在mysql.proc表中，而筆者由于采用了-A全庫備份的政策，即包含mysql庫，是以存儲過程也得以備份。-R參數一般用于單庫備份或者多庫備份。由于筆 者的水準有限，編寫時間也很倉促，文中難免會出現一些錯誤或者不準确的地方，不妥之處懇請讀者批評指正。

轉載于:https://blog.51cto.com/14311648/2409287