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简介
Binlog日志，即二进制日志文件，用于记录用户对数据库操作的SQL语句信息，当发生数据误删除的时候我们可以通过binlog日志来还原已经删除的数据，还原数据的方法分为传统二进制文件还原数据和基于GTID的二进制文件还原数据
前期准备
准备一台Centos7虚拟机，关闭防火墙和selinux，配置IP地址,同步系统时间,安装MySQL数据库
传统二进制日志还原数据
修改配置文件
| 1 2 3 4 5 6 | [root@localhost ~] # vi /etc/my.cnf server- id =1 log-bin=binlog #重启数据库服务 [root@localhost ~] # systemctl restart mysqld |
操作数据库
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | mysql> create database mydb charset utf8mb4; mysql> use mydb; mysql> create table test(id int )engine=innodb charset=utf8mb4; mysql> insert into test values (1); mysql> insert into test values (2); mysql> insert into test values (3); mysql> insert into test values (4); mysql> commit ; mysql> update test set id=10 where id=4; mysql> commit ; mysql> select * from test; + ------+ | id | + ------+ | 1 | | 2 | | 3 | | 10 | + ------+ 4 rows in set (0.00 sec) mysql> drop database mydb; |
查看二进制日志信息
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | mysql> show master status\G; *************************** 1. row *************************** File: binlog.000001 Position: 1960 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: 1 row in set (0.00 sec) #查找创库和删库的点,为219和1868 mysql> show binlog events in 'binlog.000001' ; + ---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | + ---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+ | binlog.000001 | 219 | Query | 1 | 329 | create database mydb charset utf8mb4 | | binlog.000001 | 1868 | Query | 1 | 1960 | drop database mydb | + ---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+ |
另存为二进制日志信息
| 1 | [root@localhost ~] # mysqlbinlog --start-position=219 --stop-position=1868 /var/lib/mysql/binlog.000001 > /tmp/binlog.sql |
恢复数据
| 1 2 3 4 5 6 | #临时关闭二进制日志记录以免重复记录 mysql> set sql_log_bin=0; #恢复数据 mysql> source /tmp/binlog.sql #重启二进制日志记录 mysql> set sql_log_bin=1; |
查看数据恢复情况
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | mysql> show databases; + --------------------+ | Database | + --------------------+ | information_schema | | mydb | | mysql | | performance_schema | | sys | + --------------------+ 5 rows in set (0.00 sec) mysql> use mydb; Database changed mysql> select * from test; + ------+ | id | + ------+ | 1 | | 2 | | 3 | | 10 | + ------+ 4 rows in set (0.00 sec)、 |
基于GTID二进制日志还原数据
修改配置文件
| 1 2 3 4 5 6 7 8 9 | [root@localhost ~] # vi /etc/my.cnf server- id =1 log-bin=binlog gtid_mode=ON enforce_gtid_consistency= true log_slave_updates=1 #重启数据库服务 [root@localhost ~] # systemctl restart mysqld |
操作数据库
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | mysql> create database mydb1; mysql> use mydb1; Database changed mysql> create table t1(id int )engine=innodb charset=utf8mb4; mysql> insert into t1 values (1); mysql> insert into t1 values (2); mysql> insert into t1 values (3); mysql> insert into t1 values (11); mysql> insert into t1 values (12); mysql> commit ; mysql> select * from t1; + ------+ | id | + ------+ | 1 | | 2 | | 3 | | 11 | | 12 | + ------+ 5 rows in set (0.00 sec) mysql> drop database mydb1; |
查看二进制日志信息
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | mysql> show master status\G; *************************** 1. row *************************** File: binlog.000003 Position: 1944 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: 51d3db57-bf69-11ea-976c-000c2911a022:1-8 1 row in set (0.00 sec) mysql> show binlog events in 'binlog.000003' ; + ---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | + ---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+ | binlog.000003 | 154 | Gtid | 1 | 219 | SET @@SESSION.GTID_NEXT= '51d3db57-bf69-11ea-976c-000c2911a022:1' | | binlog.000003 | 219 | Query | 1 | 316 | create database mydb1 | | binlog.000003 | 1784 | Gtid | 1 | 1849 | SET @@SESSION.GTID_NEXT= '51d3db57-bf69-11ea-976c-000c2911a022:8' | | binlog.000003 | 1849 | Query | 1 | 1944 | drop database mydb1 | + ---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+ |
另存为二进制日志信息
| 1 2 | #8号事务记录为删除数据库，因此只需恢复1-7号事务记录即可 [root@localhost ~] # mysqlbinlog --skip-gtids --include-gtids='51d3db57-bf69-11ea-976c-000c2911a022:1-7' /var/lib/mysql/binlog.000003 > /tmp/gtid.sql |
参数说明:
–include-gtids:包含事务
–exclude-gtids:排除事务
–skip-gtids:跳过事务
恢复数据
| 1 2 3 | mysql> set sql_log_bin=0; mysql> source /tmp/gtid.sql mysql> set sql_log_bin=1; |
查看数据恢复情况
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | mysql> show databases; + --------------------+ | Database | + --------------------+ | information_schema | | mydb | | mydb1 | | mysql | | performance_schema | | sys | + --------------------+ 6 rows in set (0.00 sec) mysql> use mydb1; Database changed mysql> select * from t1; + ------+ | id | + ------+ | 1 | | 2 | | 3 | | 11 | | 12 | + ------+ 5 rows in set (0.00 sec) |
到此这篇关于Centos7实现MySQL基于日志还原数据的示例代码的文章就介绍到这了。
