MySQL master database cleans data and keeps slave database

Because of business needs, I want to clean up some data in the mysql master database, but the slave database wants to keep it. According to the introduction of netizens, you can skip the cleanup command according to the binlog

.
; --Refresh the log, switch to a new binlog log, it is relatively small, it will be more convenient to modify it later
Query OK, 0 rows affected (0.21 sec)

mysql> show master status \G
*********** **************** 1. row ****************************
             File: mysql- bin.000039 -- The binlog location here will not be used later
         Position:
     33958 Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.03 sec)


2. Stop synchronization from the library --- Step 1.2 Try to operate
mysql> stop as quickly as possible slave;
Query OK, 0 rows affected (0.05 sec)

mysql> show slave status \G
**************************** 1. row * ****************************
               Slave_IO_State:
                  Master_Host: 192.168.1.196
                  Master_User: repli
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000039
          Read_Master_Log_Pos: 488906
               Relay_Log_File: mysql-relay-bin.000016
                Relay_Log_Pos: 489119
        Relay_Master_Log_File: mysql-bin.000039
             Slave_IO_Running: No
            Slave_SQL_Running: No

3.主库清空数据

mysql> truncate table t2;   步骤a
Query OK, 0 rows affected (0.46 sec)

mysql> show master status \g  步骤b
+-------+----------+--------------+---- --------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+--- ---------------+------------+--------------+-------- ----------+-------------------+
| mysql-bin.000039 | 1942762 | | | |
+------ ------------+------------+--------------+------------ -------+-------------------+
1 row in set (0.06 sec)

/usr/local/mysql/bin/mysqlbinlog mysql-bin. 000039 >000039.sql Step c

4. Edit 000039.sql, delete the truncate statement   
truncate table t2 /*!*/; ---Deleted content

Search 1942762 If you can't find the location, you may lose data, so the previous The three-step abc must pay attention to the order! It is best to include this location information in the sql, and then delete the following content to avoid repeated operations when the log is applied later.

end_log_pos 1942762 Kill everything after this position!


5. Restore
/usr/local/mysql/bin/mysql -umydba -p
source /root/000039.sql
mysql> change master to master_log_file='mysql-bin.000039', master_log_pos=1942762;
Query OK, 0 rows affected (0.19 sec)

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status \G
************************ **** 1. row ****************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.196
                  Master_User: repli
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000039
          Read_Master_Log_Pos: 10009221
               Relay_Log_File: mysql-relay-bin.000002
                Relay_Log_Pos: 8066779
        Relay_Master_Log_File: mysql-bin.000039
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 10009221
              Relay_Log_Space: 8066986
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID: 701cbadc-ba33-11e5-9091-305a3a78baf2
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

---Master-slave synchronization, skip the truncate command

6. Verify
master library:
mysql> select * from t2;
Empty set (0.00 sec)


slave library:
mysql> select * from t2;
+----+
| id |
+----+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
+----+
5 rows in set (0.00 sec)