MySQL中延迟复制的实现

CHANGE MASTER TO MASTER_DELAY = N;

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.239.210
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000007
          Read_Master_Log_Pos: 194
               Relay_Log_File: mysql-3-relay-bin.000007
                Relay_Log_Pos: 367
        Relay_Master_Log_File: mysql-bin.000007
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
          Exec_Master_Log_Pos: 194
              Relay_Log_Space: 742

             Master_Server_Id: 10
                  Master_UUID: cd27e5ae-5fe3-11ef-a5d8-000c29a51779
             Master_Info_File: /data/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL

# 停止 SQL_thread 进程，停止本地回放
mysql> stop slave sql_thread;
Query OK, 0 rows affected (0.00 sec)

# 改变 本地回放的延迟时间
mysql> change master to master_delay=60;
Query OK, 0 rows affected (0.00 sec)

# 打开本地回放 sql_thread 进程
mysql> start slave sql_thread;
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| ZUCONG             |
| mysql              |
| performance_schema |
| shuyan             |
| sys                |
+--------------------+
6 rows in set (0.03 sec)

mysql> use shuyan;
mysql> show tables;
+------------------+
| Tables_in_shuyan |
+------------------+
| wawa             |
+------------------+
mysql> select * from wawa;
+----+------+
| id | name |
+----+------+
|  1 | wawa |
+----+------+
mysql> insert into wawa(id,name) values(2,'shuyan');

mysql> select * from shuyan.wawa;
+----+--------+
| id | name   |
+----+--------+
|  1 | wawa   |
|  2 | shuyan |
+----+--------+

mysql> select * from shuyan.wawa;
+----+------+
| id | name |
+----+------+
|  1 | wawa |
+----+------+