MySQL 5.7选择性同步--几个不推荐在生产环境用的参数

MySQL选择性同步

强烈建议：尽量不要使用本文中的几个参数用作MySQL选择性同步。本文仅是测试，极不推荐生产环境中用以下参数。

测试版本：MySQL 5.7.26， 注意：MySQL5.6 可能不一样！！

说明：图中最后的都是从库的结论。比如a库的表不执行binlog指的是从库中a库中不会执行主库中binlog中的xx记录。

1 binlog-do-db

1.1 binlog_format = ROW

主库配置文件my.cnf设置：

binlog-do-db=a;

实验如下：

1.1.1 DDL语句

• 主库上DDL操作：

（1）    创建库b，创建库a

主库执行：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)
mysql> create database a;
Query OK, 1 row affected (0.00 sec)
mysql> create database b;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| a                  |
| b                  |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
6 rows in set (0.00 sec)

mysql> show master statusG

*************************** 1. row ***************************

             File: binlog.000004
         Position: 462
     Binlog_Do_DB: a
 Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
mysql>
# mysqlbinlog --base64-output=decode-rows -v -v  binlog.000004  >> ~/db_01.txt
# at 372
#200224 14:18:12 server id 1611343306  end_log_pos 462 CRC32 0x738926e7     Query   thread_id=4 exec_time=0 error_code=0
SET TIMESTAMP=1582525092/*!*/;
create database a
/*!*/;
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

从库执行：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| a                  |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

mysql> show slave statusG

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.161.134
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: binlog.000004
          Read_Master_Log_Pos: 462
               Relay_Log_File: relaylog.000006
                Relay_Log_Pos: 669
        Relay_Master_Log_File: binlog.000004
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

结论：主库创建的库，设置了binlog-do-db的库会记录在binlog日志里，而未指定的不会记录在binlog中。

（2）    在a库中创建库a的a表，在库a中创建库b的b表。

主库：

mysql> use a;
Database changed
mysql> create table a (id int);
Query OK, 0 rows affected (0.01 sec)
mysql> create table b.b (id int);
Query OK, 0 rows affected (0.01 sec)

mysql>

主库的binlog日志：
use `a`/*!*/;
SET TIMESTAMP=1582525459/*!*/;
create table a (id int)
/*!*/;
# at 623
#200224 14:24:29 server id 1611343306  end_log_pos 688 CRC32 0x0ca2b45e     Anonymous_GTID  last_committed=3    sequence_number=4   rbr_only=no
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 688
#200224 14:24:29 server id 1611343306  end_log_pos 786 CRC32 0x15eeef53     Query   thread_id=4 exec_time=0 error_code=0
SET TIMESTAMP=1582525469/*!*/;
create table b.b (id int)
/*!*/;
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

从库：

mysql> desc a.a;
+-------+---------+------+-----+---------+-------+
| Field | Type    | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id    | int(11) | YES  |     | NULL    |       |
+-------+---------+------+-----+---------+-------+
1 row in set (0.00 sec)

mysql> show slave statusG
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.161.134
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: binlog.000004
          Read_Master_Log_Pos: 786
               Relay_Log_File: relaylog.000006
                Relay_Log_Pos: 830
        Relay_Master_Log_File: binlog.000004
             Slave_IO_Running: Yes
            Slave_SQL_Running: No
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
      Last_Errno: 1049
       Last_Error: Error 'Unknown database 'b'' on query. Default database: 'a'. Query: 'create table b.b (id int)'

由于a库中的记录都同步到了binlog，而从库中没有b库，所以同步异常。

结论：在a库中的DDL操作都会记录在binlog中。

（3）    在b库中对a库的a表进行DDL
先在从库中创建b库，解决上面同步的报错，这样从库中也有了b库和b库的b表。

mysql> use b;
Database changed
mysql> alter table a.a add column name varchar(10);
Query OK, 0 rows affected (0.02 sec)
Records: 0  Duplicates: 0  Warnings: 0


mysql> desc a.a;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | int(11)     | YES  |     | NULL    |       |
| name  | varchar(10) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)

查看主库的binlog日志，发现这个操作并没有记录在binlog中。

结论：在b库中进行的DDL操作并不会记录在binlog中。因此从库中也不会执行到这一操作。

（4）    在a库中对b库的表进行DDL

主库：
mysql> use a;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> alter table b.b add column name varchar(10); 
Query OK, 0 rows affected (0.02 sec)
Records: 0  Duplicates: 0  Warnings: 0
mysql>

主库binlog日志：
# at 851
#200224 15:31:20 server id 1611343306  end_log_pos 967 CRC32 0x13c14a93     Query   thread_id=4 exec_time=0 error_code=0
SET TIMESTAMP=1582529480/*!*/;
alter table b.b add column name varchar(10)
/*!*/;
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;


从库：
mysql> desc b.b;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | int(11)     | YES  |     | NULL    |       |
| name  | varchar(10) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.01 sec)

mysql>

同步正常！        

小结论：

（1）    使用binlog-do-db参数，指定了什么库，那么在这个库上（use xxx）的DDL操作都会记录到binlog中。

（2）    使用binlog-do-db参数，在未指定的库上执行的DDL语句， 都不会记录在binlog中，尽管是操作执行binlog-do-db执行数据库的DDL。

 

1.1.2 DML 语句

• 主库DML操作：

（1）    在a库中对a库的表进行DML
让保持从库同步主库a库a表。

主库：
mysql> use a;
Database changed
mysql> drop table a;
Query OK, 0 rows affected (0.01 sec)
mysql> create table a (id int);
Query OK, 0 rows affected (0.01 sec)
mysql> insert into a values(1);
Query OK, 1 row affected (0.01 sec)

从库：
mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

结论：在a库中操作a表会记录在binlog。

（2）    在a库中对b库的表进行DML

主库：
mysql> desc b.b;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | int(11)     | YES  |     | NULL    |       |
| name  | varchar(10) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.01 sec)

mysql> use a;
Database changed
mysql> insert into b.b values(1,'b');
Query OK, 1 row affected (0.01 sec)

mysql> select * from b.b;
+------+------+
| id   | name |
+------+------+
|    1 | b    |
+------+------+
1 row in set (0.00 sec)
mysql>


从库：
mysql> select * from b.b;
Empty set (0.00 sec)
mysql>

结论：在binlog-do-db指定的库中操作其它库的DML语句，不会记录在binlog中。

（3）    在b库中对a库的表进行DML

主库：
mysql> desc a.a;
+-------+---------+------+-----+---------+-------+
| Field | Type    | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id    | int(11) | YES  |     | NULL    |       |
+-------+---------+------+-----+---------+-------+
1 row in set (0.00 sec)

mysql> use b;
Database changed
mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

mysql> insert into a.a values(2);
Query OK, 1 row affected (0.00 sec)

mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
|    2 |
+------+
2 rows in set (0.00 sec)

mysql>

主库binlog日志：
# at 1622
#200224 16:23:48 server id 1611343306  end_log_pos 1696 CRC32 0x99c73a44    Query   thread_id=4 exec_time=0 error_code=0
SET TIMESTAMP=1582532628/*!*/;
BEGIN
/*!*/;
# at 1696
#200224 16:23:48 server id 1611343306  end_log_pos 1737 CRC32 0xfef48115    Table_map: `a`.`a` mapped to number 113
# at 1737
#200224 16:23:48 server id 1611343306  end_log_pos 1777 CRC32 0x5e85445b    Write_rows: table id 113 flags: STMT_END_F
### INSERT INTO `a`.`a`
### SET
###   @1=2 /* INT meta=0 nullable=1 is_null=0 */
# at 1777
#200224 16:23:48 server id 1611343306  end_log_pos 1808 CRC32 0x602e2c5c    Xid = 78
COMMIT/*!*/;
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;


从库：
mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
|    2 |
+------+
2 rows in set (0.00 sec)

结论：binlog中没有use b的记录，操作binlog-do-db指定库的DML语句会被记录到binglog中。

2 binlog-ignore-db

主库配置文件my.cnf设置：

binlog-ignore-db=a;

2.1 binlog_format = ROW

2.1.1 DDL语句

（1）在b库中创建a库中的表

主库：
mysql> use b;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> create table a.a2 (id int);
Query OK, 0 rows affected (0.02 sec)

从库:
mysql> show tables;
+-------------+
| Tables_in_a |
+-------------+
| a           |
| a2          |
+-------------+

结论：在非binlog-ignore-db指定的库中执行的DDL语句会记录在binlog中。

（2）在a库中创建b库中的表

主库：
mysql> use a;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> create table b.b2 (id int);
Query OK, 0 rows affected (0.01 sec)
mysql>


从库：
mysql> use b;
Database changed
mysql> show tables;
+-------------+
| Tables_in_b |
+-------------+
| b           |
+-------------+
1 row in set (0.01 sec)

结论：在binlog-ignore-db指定的库中执行的DDL语句都不记录在binlog中。

 

2.1.2 DML语句

（1）在b库中对a库的表进行DML操作

主库：
mysql> use b;
Database changed
mysql> insert into a.a2 values(10);
Query OK, 1 row affected (0.00 sec)
mysql> select * from a.a2;
+------+
| id   |
+------+
|   10 |
+------+
1 row in set (0.00 sec)
mysql>

从库：
mysql> show slave statusG
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.161.134
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: binlog.000005
          Read_Master_Log_Pos: 482
               Relay_Log_File: relaylog.000009
                Relay_Log_Pos: 689
        Relay_Master_Log_File: binlog.000005
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
mysql> select * from a.a2;
Empty set (0.00 sec)

结论：在非binlog-ignore-db指定的库中执行操作binlog-ignore-db指定的库的表DML语句都不记录在binlog中。

 

（2）在a库中对b库的表进行DML操作

主库：

mysql> use a;
Database changed
mysql> select * from b.b;
+------+------+
| id   | name |
-----+------+
|    1 | b    |
+------+------+
1 row in set (0.00 sec)
mysql> insert into b.b values(2,'b1');
Query OK, 1 row affected (0.01 sec)
mysql> select * from b.b;
+------+------+
| id   | name |
+------+------+
|    1 | b    |
|    2 | b1   |
+------+------+
2 rows in set (0.00 sec)

从库：
mysql> select * from b.b;
+------+------+
| id   | name |
+------+------+
|    2 | b1   |
+------+------+
1 row in set (0.00 sec)
mysql>

结论：在binlog-ignore-db指定的库中执行操作非binlog-ignore-db指定的库的表DML语句都会记录在binlog中。

 

3 replicate-do-db

这个是对从库起作用的参数，在从库中配置：

replicate-do-db=a;

3.1 binlog_format = ROW

3.1.1 DDL语句

（1）在a库中对b库的表进行DDL

主库：
mysql> use a;
Database changed
mysql> create table b.b6 (id int);
Query OK, 0 rows affected (0.01 sec)
mysql>


从库：
mysql> use b;
Database changed
mysql> show tables;
+-------------+
| Tables_in_b |
+-------------+        
| b6          |
+-------------+
5 rows in set (0.00 sec)

结论：从库会将主库的所有binlog记录同步到relay日志，从库对于在指定replicate-do-db库中执行的DDL语句都会执行。

（2）在b库中对a库的表进行DDL

主库：
mysql> use b;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> create table a.a6 (id int);   
Query OK, 0 rows affected (0.01 sec)

从库：
mysql> use a;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+-------------+
| Tables_in_a |
+------------+
| a           |
| a1          |
| a2          |
| a4          |
+-------------+

结论：从库会将主库的所有binlog记录同步到relay日志，从库对于在非指定replicate-do-db库中执行的DDL语句都不会执行。

 

3.1.2 DML语句

（1）在a库中对b库的表进行DML

主库：
mysql> use a;
Database changed
mysql> insert into b.b6 values(1);
Query OK, 1 row affected (0.01 sec)

从库：
mysql> select * from b.b6;
Empty set (0.00 sec)

结论：从库会将主库的所有binlog记录同步到relay日志，对于非指定replicate-do-db库的DML语句都不会执行。

 

（2）在b库中对a库的表进行DML

主库：
mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
|    2 |
+------+
2 rows in set (0.00 sec)
mysql> use b;
Database changed
mysql> insert into a.a values(3);
Query OK, 1 row affected (0.00 sec)
mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
+------+
3 rows in set (0.00 sec)


从库：
mysql>
mysql> select * from a.a;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
+------+
3 rows in set (0.00 sec)

结论：从库会将主库的所有binlog记录同步到relay日志，从库对于指定replicate-do-db库的DML语句都会执行。对于非指定replicate-do-db库的DML语句都不执行。

 

4 replicate-ignore-db

这个是对从库起作用的参数，在从库中配置：

replicate-ignore-db=a;

4.1 binlog_format = ROW

4.1.1 DDL语句

（1）在a库中对b库的表进行DDL

主库：
mysql> use a;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> create table b.b7 (id int);
Query OK, 0 rows affected (0.01 sec)
mysql> alter table b.b add column (age int);
Query OK, 0 rows affected (0.05 sec)
Records: 0  Duplicates: 0  Warnings: 0

从库：
mysql> use b;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+-------------+
| Tables_in_b |
+-------------+
| b           |
| b1          |
| b2          |
| b3          |
| b6          |
+-------------+
5 rows in set (0.00 sec)

mysql> desc b;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | int(11)     | YES  |     | NULL    |       |
| name  | varchar(10) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+

结论：从库会将主库的所有binlog记录同步到relay日志，对于在replicate-ignore-db库执行的的DDL语句都不会执行。

（2）在b库中对a库的表进行DDL

主库：
mysql> use b;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> create table a.a7 (id int);           
Query OK, 0 rows affected (0.02 sec)
mysql> alter table a.a add column (age int);
Query OK, 0 rows affected (0.05 sec)
Records: 0  Duplicates: 0  Warnings: 0

从库：
mysql> use a;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> desc a;
+-------+---------+------+-----+---------+-------+
| Field | Type    | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id    | int(11) | YES  |     | NULL    |       |
| age   | int(11) | YES  |     | NULL    |       |
+-------+---------+------+-----+---------+-------+
2 rows in set (0.00 sec)
mysql> show tables;
+-------------+
| Tables_in_a |
+-------------+
| a           |
| a1          |
| a2          |
| a4          |
| a7          |
+-------------+
5 rows in set (0.00 sec)
mysql>

结论：从库会将主库的所有binlog记录同步到relay日志，对于非replicate-ignore-db库执行的的DDL语句都会执行。

 

4.1.2 DML语句

（1）在a库中对b库的表进行DML

主库：
mysql> use a;
Database changed
mysql> insert into b.b (id) values(21);
Query OK, 1 row affected (0.00 sec)


从库：
mysql> select * from b.b;
+------+------+
| id   | name |
+------+------+
|    1 | b    |
|    2 | b1   |
|   21 | NULL |
+------+------+
3 rows in set (0.00 sec)

结论：从库会将主库的所有binlog记录同步到relay日志，对于在replicate-ignore-db库中执行的非replicate-ignore-db指定库表的DML语句都会执行。

（2）在b库中对a库的表进行DML

主库：
mysql> use b;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> insert into a.a (id) values(22);
Query OK, 1 row affected (0.01 sec)


从库：
mysql> select * from a.a;
+------+------+
| id   | age  |
+------+------+
|    1 | NULL |
|    2 | NULL |
|    3 | NULL |
|    1 | NULL |
|    4 | NULL |
|  100 | NULL |
|  400 | NULL |
|  600 | NULL |
+------+------+
8 rows in set (0.00 sec)

结论：从库会将主库的所有binlog记录同步到relay日志，对于在非replicate-ignore-db库执行的非replicate-ignore-db库的表的DML语句都会执行，replicate-ignore-db库的表的DML都不会执行。

5 总结

请尽量不要在生产环境中使用以上参数！请尽量不要在生产环境中使用以上参数！请尽量不要在生产环境中使用以上参数！