Centos7 implements sample code for restoring data based on MySQL logs

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

#Restart the database service [root@localhost ~]# systemctl restart mysqld

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;

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)

 
#Find the points for creating and deleting databases, which are 219 and 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 |
+---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+

[root@localhost ~]# mysqlbinlog --start-position=219 --stop-position=1868 /var/lib/mysql/binlog.000001 > /tmp/binlog.sql

#Temporarily turn off binary logging to avoid duplicate logging mysql> set sql_log_bin=0;
#Restore datamysql> source /tmp/binlog.sql
#Restart binary logging mysql> set sql_log_bin=1;

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),

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

#Restart the database service [root@localhost ~]# systemctl restart mysqld

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;

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 |
+---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+

#Transaction record 8 is to delete the database, so only transaction records 1-7 need to be restored [root@localhost ~]# mysqlbinlog --skip-gtids --include-gtids='51d3db57-bf69-11ea-976c-000c2911a022:1-7' /var/lib/mysql/binlog.000003 > /tmp/gtid.sql

mysql> set sql_log_bin=0;
mysql> source /tmp/gtid.sql
mysql> set sql_log_bin=1;

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)