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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适合我们可以通过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

实现过程

1.修改配置文件

[root@localhost ~]# vi /etc/my.cnf
server-id = 1
log-bin=binlog

#重启数据库服务
[root@localhost ~]# systemctl restart mysqld

2.操作数据库

mysql> create database mydb charest utf8mb4 ; 
mysql> use mydb ;
mysql> create table test(id int)engine=innodb charest=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 ;

3.查看二进制日志信息

mysql> show master status\G;
*************************** 1. row ***************************
             File: binlog.000001
         Position: 1960
     Binlog_Do_Db:
 Binlog_Ignore_Db:
Executed_Gtid_Set:
1 rows 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 charest utf8mb4 |

| binlog.000001 |1868 | Query       |           1|         1960|drop database mydb                    |

+---------------+-----+-------------+------------+-------------+--------------------------------------+ 

4.另存为二进制日志信息

[root@localhost ~]# mysqlbinlog

5.恢复数据

#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 ;

6.查看数据恢复情况

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)