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NSD RDBM1 DAY04

  1. 案例1： 用户授权
  2. 案例2：root密码
  3. 案例3：数据备份与恢复
  4. 案例4：binlog日志

1 案例1： 用户授权

1.1 问题

1.2 步骤

实现此案例需要按照如下步骤进行。

步骤一：用户授权

1）允许root从192.168.4.0/24访问，对所有库表有完全权限，密码为123qqq…A

授权之前，从192.168.4.0/24网段的客户机访问时，将会被拒绝：

  1. [root@host120 ~]# mysql -u root -p -h 192.168.4.10
  2. Enter password:                                  //输入正确的密码
  3. ERROR 2003 (HY000): Host '192.168.4.120' is not allowed to connect to this MySQL server

授权操作，此处可设置与从localhost访问时不同的密码：

  1. mysql> GRANT all ON *.* TO root@'192.168.4.%' IDENTIFIED BY 'tarena';
  2. Query OK, 0 rows affected (0.00 sec)

再次从192.168.4.0/24网段的客户机访问时，输入正确的密码后可登入：

  1. [root@host120 ~]# mysql -u root -p -h 192.168.4.10
  2. Enter password:
  3. Welcome to the MySQL monitor.  Commands end with ; or \g.
  4. Your MySQL connection id is 20
  5. Server version: 5.7.17 MySQL Community Server (GPL)
  6.  
  7. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  8.  
  9. Oracle is a registered trademark of Oracle Corporation and/or its
  10. affiliates. Other names may be trademarks of their respective
  11. owners.
  12.  
  13. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  14.  
  15. mysql>

从网络登入后，测试新建一个库、查看所有库：

  1. mysql> CREATE DATABASE rootdb;                  //创建新库rootdb
  2. Query OK, 1 row affected (0.06 sec)
  3.  
  4. mysql> SHOW DATABASES;
  5. +--------------------+
  6. | Database           |
  7. +--------------------+
  8. | information_schema |
  9. | home               |
  10. | mysql              |
  11. | performance_schema |
  12. | rootdb             |                         //新建的rootdb库
  13. | sys                |
  14. | userdb             |
  15. +--------------------+
  16. 7 rows in set (0.01 sec)

2）在Mysql服务器上建立一个管理账号dba007，对所有库完全控制，并赋予其授权的权限新建账号并授权：

  1. mysql> GRANT all ON *.* TO dba007@localhost
  2.     -> IDENTIFIED BY '123qqq…A '
  3.     -> WITH GRANT OPTION;
  4. Query OK, 0 rows affected (0.00 sec)

查看dba007的权限：

  1. mysql> SHOW GRANTS FOR dba007@localhost;
  2. +-----------------------------------------------------------------------+
  3. | Grants for dba007@localhost                                           |
  4. +-----------------------------------------------------------------------+
  5. | GRANT ALL PRIVILEGES ON *.* TO 'dba007'@'localhost' WITH GRANT OPTION |
  6. +-----------------------------------------------------------------------+
  7. 1 row in set (0.00 sec)

3）撤销root从本机访问的权限，然后恢复

注意：如果没有事先建立其他管理账号，请不要轻易撤销root用户的本地访问权限，否则恢复起来会比较困难，甚至不得不重装数据库。

撤销root对数据库的操作权限：

  1. mysql> REVOKE all ON *.* FROM root@localhost;
  2. Query OK, 0 rows affected (0.00 sec)
  3. mysql> SHOW GRANTS FOR root@localhost;
  4. +--------------------------------------------------------------+
  5. | Grants for root@localhost                                    |
  6. +--------------------------------------------------------------+
  7. | GRANT USAGE ON *.* TO 'root'@'localhost' WITH GRANT OPTION   |
  8. | GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION |
  9. +--------------------------------------------------------------+
  10. 2 rows in set (0.00 sec)

验证撤销后的权限效果：

  1. mysql> exit                                      //退出当前MySQL连接
  2. Bye
  3. [root@dbsvr1 ~]# mysql -u root -p                  //重新以root从本地登入
  4. Enter password:
  5. Welcome to the MySQL monitor.  Commands end with ; or \g.
  6. Your MySQL connection id is 6
  7. Server version: 5.6.15 MySQL Community Server (GPL)
  8.  
  9. Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
  10.  
  11. Oracle is a registered trademark of Oracle Corporation and/or its
  12. affiliates. Other names may be trademarks of their respective
  13. owners.
  14.  
  15. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  16.  
  17. mysql> CREATE DATABASE newdb2014;                  //尝试新建库失败
  18. ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'newdb2014'
  19. mysql> DROP DATABASE rootdb;                          //尝试删除库失败
  20. ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'rootdb'

尝试以当前的root用户恢复权限，也会失败（无权更新授权表）：

  1. mysql> GRANT all ON *.* TO root@localhost IDENTIFIED BY '1234567';
  2. ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

怎么办呢？

退出当前MySQL连接，以上一步添加的管理账号dba007登入：

  1. mysql> exit                                          //退出当前MySQL连接
  2. Bye
  3. [root@dbsvr1 ~]# mysql -u dba007 -p                   //以另一个管理账号登入
  4. Enter password:
  5. Welcome to the MySQL monitor.  Commands end with ; or \g.
  6. Your MySQL connection id is 24
  7. Server version: 5.7.17 MySQL Community Server (GPL)
  8.  
  9. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  10.  
  11. Oracle is a registered trademark of Oracle Corporation and/or its
  12. affiliates. Other names may be trademarks of their respective
  13. owners.
  14.  
  15. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

由管理账号dba007重新为root添加本地访问权限：

  1. mysql> GRANT all ON *.* TO root@localhost IDENTIFIED BY '1234567';
  2. Query OK, 0 rows affected (0.00 sec)
  3. mysql> SHOW GRANTS FOR root@localhost;              //查看恢复结果
  4. +---------------------------------------------------------------------+
  5. | Grants for root@localhost                                           |
  6. +---------------------------------------------------------------------+
  7. | GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |
  8. | GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION        |
  9. +---------------------------------------------------------------------+
  10. 2 rows in set (0.00 sec)

退出，再重新以root登入，测试一下看看，权限又恢复了吧：

  1. mysql> exit                                      //退出当前MySQL连接
  2. Bye
  3. [root@dbsvr1 ~]# mysql -u root -p                 //重新以root登入
  4. Enter password:
  5. Welcome to the MySQL monitor.  Commands end with ; or \g.
  6. Your MySQL connection id is 25
  7. Server version: 5.7.17 MySQL Community Server (GPL)
  8.  
  9. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  10.  
  11. Oracle is a registered trademark of Oracle Corporation and/or its
  12. affiliates. Other names may be trademarks of their respective
  13. owners.
  14.  
  15. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  16.  
  17. mysql> CREATE DATABASE newdb2014;                  //成功创建新库
  18. Query OK, 1 row affected (0.00 sec)

4）允许webuser从任意客户机登录，只对webdb库有完全权限，密码为 123qqq…A

添加授权：

  1. mysql> GRANT all ON webdb.* TO webuser@'%' IDENTIFIED BY '888888';
  2. Query OK, 0 rows affected (0.00 sec)

查看授权结果：

  1. mysql> SHOW GRANTS FOR webuser@'%';
  2. +----------------------------------------------------+
  3. | Grants for webuser@%                               |
  4. +----------------------------------------------------+
  5. | GRANT USAGE ON *.* TO 'webuser'@'%'                |
  6. | GRANT ALL PRIVILEGES ON `webdb`.* TO 'webuser'@'%' |
  7. +----------------------------------------------------+
  8. 2 rows in set (0.00 sec)

5）撤销webuser的完全权限，改为查询权限

撤销所有权限：

  1. mysql> REVOKE all ON webdb.* FROM webuser@'%';
  2. Query OK, 0 rows affected (0.00 sec)

只赋予查询权限：

  1. mysql> GRANT select ON webdb.* TO webuser@'%';
  2. Query OK, 0 rows affected (0.00 sec)

确认授权更改结果：

  1. mysql> SHOW GRANTS FOR webuser@'%';
  2. +--------------------------------------------+
  3. | Grants for webuser@%                       |
  4. +--------------------------------------------+
  5. | GRANT USAGE ON *.* TO 'webuser'@'%'        |
  6. | GRANT SELECT ON `webdb`.* TO 'webuser'@'%' |
  7. +--------------------------------------------+
  8. 2 rows in set (0.00 sec)

2 案例2：root密码

2.1 问题

具体要求如下：

2.2 步骤

实现此案例需要按照如下步骤进行。

步骤一：恢复管理员root密码

1）首先停止已运行的MySQL服务程序

  1. [root@dbsvr1 ~]# systemctl  stop mysqld.service           //停止服务
  2. [root@dbsvr1 ~]# systemctl  status mysqld.service          //确认状态
  3. mysqld.service - MySQL Server
  4.    Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)
  5.    Active: inactive (dead) since 五 2017-04-07 23:01:38 CST; 21s ago
  6.      Docs: man:mysqld(8)
  7.            http://dev.mysql.com/doc/refman/en/using-systemd.html
  8.   Process: 20260 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  9.   Process: 20238 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
  10.  Main PID: 20262 (code=exited, status=0/SUCCESS)

2）然后跳过授权表启动MySQL服务程序

这一步主要利用mysqld的 --skip-grant-tables选项

修改my.cnf配置，添加 skip_grant_tables=1启动设置：

  1. [root@dbsvr1 ~]# vim /etc/my.cnf
  2. [mysqld]
  3. skip_grant_tables
  4. .. ..
  5. [root@dbsvr1 ~]# systemctl  start mysqld.service
  6.  
  7. [root@dbsvr1 ~]# service mysql status
  8. mysqld.service - MySQL Server
  9.    Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)
  10.    Active: active (running) since 五 2017-04-07 23:40:20 CST; 40s ago
  11.      Docs: man:mysqld(8)
  12.            http://dev.mysql.com/doc/refman/en/using-systemd.html
  13.   Process: 11698 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  14.   Process: 11676 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
  15.  Main PID: 11701 (mysqld)
  16.    CGroup: /system.slice/mysqld.service
  17.            └─11701 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.p...

3）使用mysql命令连接到MySQL服务，重设root的密码

由于前一步启动的MySQL服务跳过了授权表，所以可以root从本机直接登录

  1. [root@dbsvr1 ~]# mysql  //直接回车即可
  2.                                 
  3. Welcome to the MySQL monitor.  Commands end with ; or \g.
  4. Your MySQL connection id is 4
  5. Server version: 5.7.17 MySQL Community Server (GPL)
  6.  
  7. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  8.  
  9. Oracle is a registered trademark of Oracle Corporation and/or its
  10. affiliates. Other names may be trademarks of their respective
  11. owners.
  12.  
  13. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  14.  
  15. mysql>

进入 mysql> 环境后，通过修改mysql库中user表的相关记录，重设root用户从本机登录的密码：

  1. mysql> UPDATE mysql.user SET authentication_string=PASSWORD('123qqq…A')
  2.     -> WHERE user='root' AND host='localhost';              //重设root的密码
  3. Query OK, 1 row affected, 1 warning (0.00 sec)
  4. Rows matched: 1  Changed: 1  Warnings: 1
  5. mysql> FLUSH PRIVILEGES;                                  //刷新授权表
  6. Query OK, 0 rows affected (0.01 sec)
  7. mysql> exit                                              //退出mysql> 环境
  8. Bye

通过执行“FLUSH PRIVILEGES;”可使授权表立即生效，对于正常运行的MySQL服务，也可以用上述方法来修改密码，不用重启服务。本例中因为是恢复密码，最好重启MySQL服务程序，所以上述“FLUSH PRIVILEGES;”操作可跳过。

4）重新以正常方式启动MySQL服务程序，验证新密码

如果前面是修改/etc/my.cnf配置的方法来跳过授权表，则重置root密码后，应去除相应的设置以恢复正常：

  1. [root@dbsvr1 ~]# vim /etc/my.cnf
  2. [mysqld]
  3. #skip_grant_tables=1                              //注释掉或删除此行
  4. .. ..

按正常方式，通过mysql脚本重启服务即可：

  1. [root@dbsvr1 ~]# systemctl  restart mysqld.service

验证无密码登录时，将会被拒绝：

  1. [root@dbsvr1 ~]# mysql -u root
  2. Enter password:                            //没有跳过授权表回车会报错
  3. ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

只有提供重置后的新密码，才能成功登入：

  1. [root@dbsvr1 ~]# mysql -uroot –p123qqq…A
  2. Welcome to the MySQL monitor.  Commands end with ; or \g.
  3. Your MySQL connection id is 4
  4. Server version: 5.7.17 MySQL Community Server (GPL)
  5.  
  6. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  7.  
  8. Oracle is a registered trademark of Oracle Corporation and/or its
  9. affiliates. Other names may be trademarks of their respective
  10. owners.
  11.  
  12. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  13.  
  14. mysql>

步骤二：重置管理员root密码

正常的前提是：已知当前MySQL管理用户（root）的密码。

1）方法1，在Shell命令行下设置

使用mysqladmin管理工具，需要验证旧的密码。比如，以下操作将会把root的密码设置为 1234567：

  1. [root@dbsvr1 ~]# mysqladmin -uroot -p password 'A…qqq321'                    
  2. Enter password:                                   //验证原来的密码
  3. mysqladmin: [Warning] Using a password on the command line interface can be insecure.
  4. Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.                              //提示明文修改不安全，并不是报错
  5. [root@dbsvr1 ~]# mysql -uroot –pA…qqq321  //使用修改后的密码登录
  6. Welcome to the MySQL monitor.  Commands end with ; or \g.
  7. Your MySQL connection id is 4
  8. Server version: 5.7.17 MySQL Community Server (GPL)
  9.  
  10. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  11.  
  12. Oracle is a registered trademark of Oracle Corporation and/or its
  13. affiliates. Other names may be trademarks of their respective
  14. owners.
  15.  
  16. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  17.  
  18. mysql>

步骤三：修改管理员root密码的其他方法

1）方法1，以root登入mysql> 后，使用SET PASSWORD指令设置

这个与新安装MySQL-server后首次修改密码时要求的方式相同，平时也可以用：

  1. mysql> SET PASSWORD FOR root@localhost=PASSWORD('1234567');
  2. Query OK, 0 rows affected, 1 warning (0.00 sec)

2）方法2，以root登入mysql> 后，使用GRANT授权工具设置

这个是最常见的用户授权方式（下一节会做更多授权的练习）：

  1. mysql> GRANT all ON *.* TO root@localhost IDENTIFIED BY '1234567';
  2. Query OK, 0 rows affected, 1 warning (0.00 sec)

3）方法3，以root登入mysql> 后，使用UPDATE更新相应的表记录

这种方法与恢复密码时的操作相同：

  1. mysql> UPDATE mysql.user SET authentication_string=PASSWORD('1234567')
  2.     -> WHERE user='root' AND host='localhost';          //重设root的密码
  3. Query OK, 0 rows affected, 1 warning (0.00 sec)
  4. Rows matched: 1  Changed: 0  Warnings: 1
  5. mysql> FLUSH PRIVILEGES;                                  //刷新授权表
  6. Query OK, 0 rows affected (0.00 sec)

在上述方法中，需要特别注意：当MySQL服务程序以 skip-grant-tables 选项启动时，如果未执行“FLUSH PRIVILEGES;”操作，是无法通过SET PASSWORD或者GRANT方式来设置密码的。比如，验证这两种方式时，都会看到ERROR 1290的出错提示：

  1. mysql> SET PASSWORD FOR root@localhost=PASSWORD('1234567');
  2. ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement
  3.  
  4. mysql> GRANT all ON *.* TO root@localhost IDENTIFIED BY '1234567';
  5. ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

3 案例3：数据备份与恢复

3.1 问题

具体要求如下：

3.2 步骤

实现此案例需要按照如下步骤进行。

步骤一：练习mysqldump命令的使用

1）备份MySQL服务器上的所有库

将所有的库备份为mysql-all.sql文件：

  1. [root@dbsvr1 ~]# mysqldump -u root -p --all-databases > /root/alldb.sql
  2. Enter password:                                  //验证口令
  3. [root@dbsvr1 mysql]# file /root/alldb.sql          //确认备份文件类型
  4. /root/alldb.sql: UTF-8 Unicode English text, with very long lines

查看备份文件alldb.sql的部分内容：

  1. [root@dbsvr1 ~]# grep -vE '^/|^-|^$' /root/alldb.sql | head -15
  2. CREATE DATABASE /*!32312 IF NOT EXISTS*/ `home` /*!40100 DEFAULT CHARACTER SET latin1 */;
  3. USE `home`;
  4. DROP TABLE IF EXISTS `biao01`;
  5. CREATE TABLE `biao01` (
  6.   `id` int(2) NOT NULL,
  7.   `name` varchar(8) DEFAULT NULL
  8. ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
  9. LOCK TABLES `biao01` WRITE;
  10. UNLOCK TABLES;
  11. DROP TABLE IF EXISTS `biao02`;
  12. CREATE TABLE `biao02` (
  13.   `id` int(4) NOT NULL,
  14.   `name` varchar(8) DEFAULT NULL,
  15.   PRIMARY KEY (`id`)
  16. ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
  17. .. ..

注意：若数据库都使用MyISAM存储引擎，可以采用冷备份的方式，直接复制对应的数据库目录即可；恢复时重新复制回来就行。

2）只备份指定的某一个库

将userdb库备份为userdb.sql文件：

  1. [root@dbsvr1 ~]# mysqldump -u root -p userdb > userdb.sql
  2. Enter password:                                  //验证口令

查看备份文件userdb.sql的部分内容：

  1. [root@dbsvr1 ~]# grep -vE '^/|^-|^$' /root/userdb.sql
  2. DROP TABLE IF EXISTS `stu_info`;
  3. CREATE TABLE `stu_info` (
  4.   `name` varchar(12) NOT NULL,
  5.   `gender` enum('boy','girl') DEFAULT 'boy',
  6.   `age` int(3) NOT NULL
  7. ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
  8. LOCK TABLES `stu_info` WRITE;
  9. .. ..

3）同时备份指定的多个库

同时备份mysql、userdb库，保存为mysql+userdb.sql文件：

  1. [root@dbsvr1 ~]# mysqldump -u root -p -B mysql  userdb > mysql+test+userdb.sql
  2. Enter password:                                  //验证口令

查看备份文件userdb.sql的部分内容：

  1. [root@dbsvr1 ~]# grep '^CREATE DATA' /root/mysql+userdb.sql
  2. CREATE DATABASE /*!32312 IF NOT EXISTS*/ `mysql` /*!40100 DEFAULT CHARACTER SET latin1 */;
  3. CREATE DATABASE /*!32312 IF NOT EXISTS*/ `userdb` /*!40100 DEFAULT CHARACTER SET latin1 */;

步骤二：使用mysql 命令恢复删除的数据

以恢复userdb库为例，可参考下列操作。通常不建议直接覆盖旧库，而是采用建立新库并导入逻辑备份的方式执行恢复，待新库正常后即可废弃或删除旧库。

1）创建名为userdb2的新库

  1. mysql> CREATE DATABASE userdb2;
  2. Query OK, 1 row affected (0.00 sec)

2）导入备份文件，在新库中重建表及数据

  1. [root@dbsvr1 ~]# mysql -u root -p userdb2 < /root/userdb.sql
  2. Enter password:                                  //验证口令

3）确认新库正常，启用新库

  1. mysql> USE userdb2;                              //切换到新库
  2. Reading table information for completion of table and column names
  3. You can turn off this feature to get a quicker startup with -A
  4.  
  5. Database changed
  6. mysql> SELECT sn,username,uid,gid,homedir          //查询数据，确认可用
  7.     -> FROM userlist LIMIT 10;
  8. +----+----------+-----+-----+-----------------+
  9. | sn | username | uid | gid | homedir         |
  10. +----+----------+-----+-----+-----------------+
  11. |  1 | root     |   0 |   0 | /root           |
  12. |  2 | bin      |   1 |   1 | /bin            |
  13. |  3 | daemon   |   2 |   2 | /sbin           |
  14. |  4 | adm      |   3 |   4 | /var/adm        |
  15. |  5 | lp       |   4 |   7 | /var/spool/lpd  |
  16. |  6 | sync     |   5 |   0 | /sbin           |
  17. |  7 | shutdown |   6 |   0 | /sbin           |
  18. |  8 | halt     |   7 |   0 | /sbin           |
  19. |  9 | mail     |   8 |  12 | /var/spool/mail |
  20. | 10 | operator |  11 |   0 | /root           |
  21. +----+----------+-----+-----+-----------------+
  22. 10 rows in set (0.00 sec)

4）废弃或删除旧库

  1. mysql> DROP DATABASE userdb;
  2. Query OK, 2 rows affected (0.09 sec)

4 案例4：binlog日志

4.1 问题

启用binlog日志，具体要求如下：

4.2 步骤

实现此案例需要按照如下步骤进行。

步骤一：启用binlog日志

1）修改配置文件，并重启服务。

  1. [root@dbsvr1 ~]# vim  /etc/my.cnf
  2. [mysqld]
  3.     server_id=1  //指定server_id
  4. log-bin=/mylog/db50  //指定日志目录及名称                           
  5. :wq
  6. [root@dbsvr1 ~]# mkdir  /mylog   //创建目录
  7. [root@dbsvr1 ~]# chown  mysql  /mylog   //修改所有者
  8. [root@dbsvr1 ~]# setenforce 0 //禁用selinux
  9. [root@dbsvr1 ~]# systemctl  restart mysqld.service  //重启服务

2）查看日志信息

  1. [root@dbsvr1 ~]# 
  2. [root@localhost ~]# mysql -uroot -p123qqq...A //管理员登录
  3. mysql: [Warning] Using a password on the command line interface can be insecure.
  4. Welcome to the MySQL monitor.  Commands end with ; or \g.
  5. Your MySQL connection id is 3
  6. Server version: 5.7.17-log MySQL Community Server (GPL)
  7.  
  8. Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
  9.  
  10. Oracle is a registered trademark of Oracle Corporation and/or its
  11. affiliates. Other names may be trademarks of their respective
  12. owners.
  13.  
  14. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  15.  
  16. mysql> show master status; //查看日志信息
  17. +-------------+----------+--------------+------------------+-------------------+
  18. | File        | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
  19. +-------------+----------+--------------+------------------+-------------------+
  20. | db50.000001 |      154 |              |                  |                   |
  21. +-------------+----------+--------------+------------------+-------------------+
  22. 1 row in set (0.00 sec)
  23.  
  24. mysql>

3）手动创建3个新的日志文件

  1. mysql>
  2. mysql> flush logs;  //刷新日志
  3. Query OK, 0 rows affected (0.14 sec)
  4.  
  5. mysql> flush logs; //刷新日志
  6. Query OK, 0 rows affected (0.11 sec)
  7.  
  8. mysql> flush logs; //刷新日志
  9. Query OK, 0 rows affected (0.12 sec)
  10.  
  11. mysql> system ls /mylog/  //查看日志文件
  12. db50.000001  db50.000002  db50.000003  db50.000004  db50.index
  13. mysql> 
  14. mysql> show master status; //查看日志信息
  15. +-------------+----------+--------------+------------------+-------------------+
  16. | File        | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
  17. +-------------+----------+--------------+------------------+-------------------+
  18. | db50.000004 |      154 |              |                  |                   |
  19. +-------------+----------+--------------+------------------+-------------------+
  20. 1 row in set (0.00 sec)
  21.  
  22. mysql>

4）删除编号3之前的日志文件

  1.  mysql>
  2.  
  3. mysql> purge  master  logs  to  "db50.000003"; //删除日志
  4. Query OK, 0 rows affected (0.05 sec)
  5.  
  6. mysql> system ls /mylog/    //查看日志文件
  7. db50.000003  db50.000004  db50.index
  8. mysql> 
  9. mysql> system cat /mylog/db50.index //查看索引文件
  10. /mylog/db50.000003
  11. /mylog/db50.000004
  12. mysql>