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将3306实例下sakila的两张表actor同步到5725实例下的ming数据库中。

初始化数据

MySQLdump -uroot -poracle -q --single-transaction -n -B sakila --tables actor --master-data=2 > sakila.sql

注意添加-n，不生成创建database的语句。

mysql> create database ming;

Query OK, 1 row affected (0.00 sec)

mysql> use ming

Database changed

mysql> source /root/sakila.sql

修改从库参数文件，并重启从库

添加：

replicate-rewrite-db = sakila -> ming

CHANGE MASTER TO

MASTER_HOST='192.168.61.2',

MASTER_USER='repl',

MASTER_PASSWORD='oracle',

MASTER_LOG_FILE='mysql-bin.000013',

MASTER_LOG_POS=154;

如果只添加replicate-rewrite-db这个参数，只是实现了数据库级别的复制，还不是表级别。这样会很容易复制其他操作到从库，导致sql thread报错。

比如主库执行

mysql> use sakila

mysql> create table actor_bak like actor;

Query OK, 0 rows affected (0.31 sec)

mysql> insert into actor_bak select * from actor;

Query OK, 200 rows affected (0.17 sec)

Records: 200  Duplicates: 0  Warnings: 0

mysql> update tt.test01 set c2=10 where c1=9;

Query OK, 1 row affected (0.12 sec)

Rows matched: 1  Changed: 1  Warnings: 0

有关actor_bak的动作会被传递到从库。但是从库没有tt数据库，那么就会sql thread进程就会报错。

Last_SQL_Error: Error 'Unknown database 'tt'' on query. Default database: 'ming'. Query: 'create table tt.t1 like actor_bak'

所以完整的写法应该是；

replicate-rewrite-db = sakila -> ming

replicate-wild-do-table=ming.actor

主库执行

mysql> use sakila

mysql> insert into  tt.t1 select * from actor_bak;                

Query OK, 200 rows affected (0.00 sec)

Records: 200  Duplicates: 0  Warnings: 0

从库不会再报错。

添加如上参数后，可以在show slave status中看到。

mysql [localhost] {msandbox} ((none))   > show slave status\G *************************** 1. row   ***************************                Slave_IO_State: Waiting for   master to send event                   Master_Host: 192.168.61.2                   Master_User: repl                   Master_Port: 3306                 Connect_Retry: 60               Master_Log_File:   mysql-bin.000013             Read_Master_Log_Pos: 9815                Relay_Log_File:   relay-bin.000004                 Relay_Log_Pos: 4683           Relay_Master_Log_File: mysql-bin.000013              Slave_IO_Running: Yes             Slave_SQL_Running: Yes               Replicate_Do_DB:             Replicate_Ignore_DB:              Replicate_Do_Table:          Replicate_Ignore_Table:         Replicate_Wild_Do_Table:   ming.actor     Replicate_Wild_Ignore_Table:                    Last_Errno: 0                    Last_Error:                  Skip_Counter: 0             Exec_Master_Log_Pos: 9815               Relay_Log_Space: 4884               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: 1051295                   Master_UUID:   4c312339-ab38-11e9-86a8-000c29050245              Master_Info_File:   /root/sandboxes/msb_5_7_25/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:   (sakila,ming)                  Channel_Name:              Master_TLS_Version: 1 row in set (0.00 sec)

在线修改参数前，需要先暂停SQL thread进程：

mysql [localhost] {msandbox} ((none)) >  stop slave sql_thread;

Query OK, 0 rows affected (0.00 sec)

mysql [localhost] {msandbox} ((none)) > change replication filter replicate_rewrite_db=((sakila,ming));

Query OK, 0 rows affected (0.00 sec)

mysql [localhost] {msandbox} ((none)) > start slave sql_thread;

Query OK, 0 rows affected (0.00 sec)

Remove参数

CHANGEREPLICATIONFILTER    REPLICATE_DO_DB=(),REPLICATE_IGNORE_DB=();

其它写法：

CHANGE REPLICATION FILTER

REPLICATE_WILD_IGNORE_TABLE = ('db1.new%', 'db2.new%');

如果相同的过滤规则出现了多次，那么只有最后一个规则会生效：

CHANGE REPLICATION FILTER

REPLICATE_DO_DB = (db1, db2), REPLICATE_DO_DB = (db3, db4);

CHANGE REPLICATION FILTER

REPLICATE_DO_DB = (db3,db4);

CHANGE REPLICATION FILTER

    REPLICATE_DO_DB = (d1), REPLICATE_IGNORE_DB = (d2);

上述就是小编为大家分享的replicate-rewrite-db和Replicate_Wild_Do_Table如何实现表级别映射复制了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注创新互联行业资讯频道。

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