这期内容当中小编将会给大家带来有关replicate-rewrite-db和Replicate_Wild_Do_Table如何实现表级别映射复制，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

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，欢迎关注亿速云行业资讯频道。