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replicate-rewrite-db和Replicate_Wild_Do_Table实现表级别映射复制

原创 MySQL 作者:水逸冰 时间:2019-12-15 17:29:26 0 删除 编辑

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

CHANGE REPLICATION FILTER     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 );


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