mysql 5.7在配置复制过滤时比之前的版本有了些进步,不需要重新启动mysql,直接通过change replication filter语句就可以了。
CHANGE REPLICATION FILTER语句命令的语法如下:
CHANGE REPLICATION FILTER filter[, filter][, ...] filter: REPLICATE_DO_DB = (db_list) | REPLICATE_IGNORE_DB = (db_list) | REPLICATE_DO_TABLE = (tbl_list) | REPLICATE_IGNORE_TABLE = (tbl_list) | REPLICATE_WILD_DO_TABLE = (wild_tbl_list) | REPLICATE_WILD_IGNORE_TABLE = (wild_tbl_list) | REPLICATE_REWRITE_DB = (db_pair_list) db_list: db_name[, db_name][, ...] tbl_list: db_name.table_name[, db_table_name][, ...] wild_tbl_list: 'db_pattern.table_pattern'[, 'db_pattern.table_pattern'][, ...] db_pair_list: (db_pair)[, (db_pair)][, ...] db_pair: from_db, to_db
在slave库中可以用这个命令来过滤master库的语句。
--REPLICATE_DO_DB和REPLICATE_IGNORE_DB分别指定需要同步的以及不需要同步的DB。
--REPLICATE_DO_TABLE和REPLICATE_IGNORE_TABLE分别指定需要同步的表以及不需要同步的表,5.7.5以后必须在表前指定DB name,如DB1.tb1_name。
-REPLICATE_WILD_DO_TABLE和REPLICATE_WILD_IGNORE_TABLE可以用来模糊匹配需要同步以及不需要同步的表名,在设定时必须用单引号。
--REPLICATE_REWRITE_DB必须设置一组DB,在savle库中用新的DB来替换master库中对应的DB操作。
除了用命令的方法指定过滤也可以在mysql启动时用参数的方法,比如 mysql -uroot -p --replicate_do_db=(db1),这个方法需要重启数据库。
下面测试一下这个功能,仅测试replicate_do_db的功能,其它的都大同小异。
1.默认情况下master所有的操作都会同步到slave:
master:
mysql> create database db1; Query OK, 1 row affected (0.01 sec) mysql> create database db2; Query OK, 1 row affected (0.00 sec) mysql> create database db3; Query OK, 1 row affected (0.00 sec)
mysql> create table db1.t1 (id int); Query OK, 0 rows affected (0.02 sec) mysql> create table db2.t1 (id int); Query OK, 0 rows affected (0.05 sec)
slave:
mysql> select * from db1.t1; Empty set (0.03 sec) mysql> select * from db2.t1; Empty set (0.00 sec)2.设置 REPLICATE_DO_DB和 REPLICATE_IGNORE_DB
slave:
mysql> change replication filter replicate_do_db=(db1); ERROR 3017 (HY000): This operation cannot be performed with a running slave sql thread; run STOP SLAVE SQL_THREAD first
#必须先停止sql_thread进程 mysql> stop slave sql_thread; Query OK, 0 rows affected (0.01 sec) mysql> change replication filter replicate_do_db=(db1); Query OK, 0 rows affected (0.00 sec)
mysql> start slave sql_thread; Query OK, 0 rows affected (0.00 sec)
master:
mysql> insert into db1.t1 values(1); Query OK, 1 row affected (0.00 sec) mysql> insert into db2.t1 values(1); Query OK, 1 row affected (0.00 sec) mysql> commit; Query OK, 0 rows affected (0.00 sec)
slave库只有db1的数据同步过来了。
mysql> select * from db1.t1; +------+ | id | +------+ | 1 | +------+ 1 row in set (0.00 sec) mysql> select * from db2.t1; Empty set (0.00 sec)
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.17.61.131 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql_bin.000038 Read_Master_Log_Pos: 4774 Relay_Log_File: slave_relay_bin.000002 Relay_Log_Pos: 2624 Relay_Master_Log_File: mysql_bin.000038 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: db1 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: 4774 Relay_Log_Space: 2831 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: 10000 Master_UUID: 8d8746fb-2cc6-11e8-b1b6-000c295c63e0 Master_Info_File: /u01/mysql/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)
注意Replicate_Do_DB: db1的值已经开始起作用了。
如果要取消这个设定:
slave:
mysql> stop slave sql_thread; Query OK, 0 rows affected (0.00 sec) mysql> change replication filter replicate_do_db=(); Query OK, 0 rows affected (0.00 sec) mysql> start slave sql_thread; Query OK, 0 rows affected (0.01 sec)
需要注意的是由于设置了复制过滤,在开始复制过滤期间master库的许多事务都没有同步到slave,主从肯定会不同步的。取消复制过滤后需要根据实际情况手工重新同步数据。