MySQL参数binlog-do-db对binlogs写入的影响

1. 环境描述

目的：当数据库中设置了binlog-do-db时，在不同的binlog_format=statement | row | mixed 下对binlog的写入影响，这个在主从复制中会有一些坑，由于binlog的写入不完全，极有可能会导致主从不一致的情况的。

blog地址：http://blog.csdn.net/hw_libo/article/details/40476577

SuSE 11 sp1 x86_64 + MySQL 5.5.37

参数设置：

binlog-do-db = bosco1

测试样例1：

use bosco2;
create table bosco1.bosco1_tb01(id int);
create table bosco2.bosco2_tb01(id int);
insert into bosco1.bosco1_tb01(id) values(1);
insert into bosco2.bosco2_tb01(id) values(1);

测试样例2：

use bosco1;
create table bosco1.bosco1_tb01(id int);
create table bosco2.bosco2_tb01(id int);
insert into bosco1.bosco1_tb01(id) values(1);
insert into bosco2.bosco2_tb01(id) values(1);

2. 测试1：use bosco2及SBR/RBR/MBR下

binlog-do-db=bosco1;MySQL [(none)]> use bosco2;
Database changedMySQL [bosco2]> select @@tx_isolation,@@binlog_format;
+-----------------+-----------------+
| @@tx_isolation  | @@binlog_format |
+-----------------+-----------------+
| REPEATABLE-READ | STATEMENT       |
+-----------------+-----------------+
1 row in set (0.00 sec)MySQL [bosco1]> flush logs;
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> create table bosco1.bosco1_tb01(id int);
Query OK, 0 rows affected (0.01 sec)MySQL [bosco1]> create table bosco2.bosco2_tb01(id int);
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> insert into bosco1.bosco1_tb01(id) values(1);
Query OK, 1 row affected (0.01 sec)MySQL [bosco1]> insert into bosco2.bosco2_tb01(id) values(1);
Query OK, 1 row affected (0.00 sec)MySQL [bosco1]> flush logs;
Query OK, 0 rows affected (0.01 sec)

那么来查看一下上面的操作有没有写入binlog中：

# mysqlbinlog --verbose --base64-output=decode-rows mysql-bin.000013
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#141026  1:41:09 server id 1303308  end_log_pos 107     Start: binlog v 4, server v 5.5.37-log created 141026  1:41:09
# at 107
#141026  1:43:02 server id 1303308  end_log_pos 150     Rotate to mysql-bin.000014  pos: 4
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

可见，指定了binlog-do-db=bosco1，事务隔离级别RR + binlog_format=statement或是row，在使用其他database（非bosco1数据库）下的所有操作都不会记录到binlogs中，即使是操作binlog-do-db=bosco1下的表；而且DDL也不会被记录。

3. 测试2：use bosco1及RBR下

binlog-do-db=bosco1;MySQL [bosco2]> use bosco1;MySQL [bosco1]> select @@tx_isolation,@@binlog_format;
+-----------------+-----------------+
| @@tx_isolation  | @@binlog_format |
+-----------------+-----------------+
| REPEATABLE-READ | ROW             |
+-----------------+-----------------+
1 row in set (0.00 sec)MySQL [bosco1]> flush logs;
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> create table bosco1.bosco1_tb01(id int);
Query OK, 0 rows affected (0.01 sec)MySQL [bosco1]> create table bosco2.bosco2_tb01(id int);
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> insert into bosco1.bosco1_tb01(id) values(1);
Query OK, 1 row affected (0.01 sec)MySQL [bosco1]> insert into bosco2.bosco2_tb01(id) values(1);
Query OK, 1 row affected (0.00 sec)MySQL [bosco1]> flush logs;
Query OK, 0 rows affected (0.01 sec)

那么来查看一下上面的操作有没有写入binlog中：

# mysqlbinlog --verbose --base64-output=decode-rows mysql-bin.000006
……
SET @@session.collation_database=DEFAULT/*!*/;
create table bosco1.bosco1_tb01(id int)
/*!*/;
# at 211
#141026  1:37:44 server id 1303308  end_log_pos 315     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258664/*!*/;
create table bosco2.bosco2_tb01(id int)
/*!*/;
# at 315
#141026  1:37:44 server id 1303308  end_log_pos 385     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258664/*!*/;
BEGIN
/*!*/;
# at 385
# at 437
#141026  1:37:44 server id 1303308  end_log_pos 437     Table_map: `bosco1`.`bosco1_tb01` mapped to number 49
#141026  1:37:44 server id 1303308  end_log_pos 471     Write_rows: table id 49 flags: STMT_END_F
### INSERT INTO `bosco1`.`bosco1_tb01`
### SET
###   @1=1
# at 471
#141026  1:37:44 server id 1303308  end_log_pos 498     Xid = 200
COMMIT/*!*/;
# at 498
#141026  1:37:49 server id 1303308  end_log_pos 541     Rotate to mysql-bin.000011  pos: 4
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

可见，指定了binlog-do-db=bosco1，事务隔离级别RR + binlog_format=row：
在使用指定的database（bosco1数据库）下操作本身库中的表所有DDL/DML操作都会记录到binlogs中，而操作其他库中的表时，只有DDL操作被记录下来，DML操作都不会记录。

4. 测试3：use bosco1及SBR/MBR下

binlog-do-db=bosco1;MySQL [bosco2]> use bosco1;MySQL [bosco1]> select @@tx_isolation,@@binlog_format;
+-----------------+-----------------+
| @@tx_isolation  | @@binlog_format |
+-----------------+-----------------+
| REPEATABLE-READ | STATEMENT       |
+-----------------+-----------------+
1 row in set (0.00 sec)MySQL [bosco1]> flush logs;
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> create table bosco1.bosco1_tb01(id int);
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> create table bosco2.bosco2_tb01(id int);
Query OK, 0 rows affected (0.00 sec)MySQL [bosco1]> insert into bosco1.bosco1_tb01(id) values(1);
Query OK, 1 row affected (0.00 sec)MySQL [bosco1]> insert into bosco2.bosco2_tb01(id) values(1);
Query OK, 1 row affected (0.00 sec)MySQL [bosco1]> flush logs;
Query OK, 0 rows affected (0.00 sec)

那么来查看一下上面的操作有没有写入binlog中：

# mysqlbinlog --verbose --base64-output=decode-rows mysql-bin.000008
……
SET @@session.collation_database=DEFAULT/*!*/;
create table bosco1.bosco1_tb01(id int)
/*!*/;
# at 211
#141026  1:33:43 server id 1303308  end_log_pos 315     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258423/*!*/;
create table bosco2.bosco2_tb01(id int)
/*!*/;
# at 315
#141026  1:33:48 server id 1303308  end_log_pos 385     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258428/*!*/;
BEGIN
/*!*/;
# at 385
#141026  1:33:48 server id 1303308  end_log_pos 494     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258428/*!*/;
insert into bosco1.bosco1_tb01(id) values(1)
/*!*/;
# at 494
#141026  1:33:48 server id 1303308  end_log_pos 521     Xid = 188
COMMIT/*!*/;
# at 521
#141026  1:33:50 server id 1303308  end_log_pos 591     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258430/*!*/;
BEGIN
/*!*/;
# at 591
#141026  1:33:50 server id 1303308  end_log_pos 700     Query   thread_id=14   exec_time=0    error_code=0
SET TIMESTAMP=1414258430/*!*/;
insert into bosco2.bosco2_tb01(id) values(1)
/*!*/;
# at 700
#141026  1:33:50 server id 1303308  end_log_pos 727     Xid = 189
COMMIT/*!*/;
# at 727
#141026  1:33:58 server id 1303308  end_log_pos 770     Rotate to mysql-bin.000009  pos: 4
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

可见，指定了binlog-do-db=bosco1，事务隔离级别RR + binlog_format=statement，在使用指定的database（bosco1数据库）下操作所有数据库下的表中的所有操作DML都会记录到binlogs中，即使是操作非binlog-do-db=bosco1指定数据库下的表；而且DDL也会被记录。另外在binlog_format=mixed下也是一样的结果。

有兴趣的朋友，也可以测试下binlog-ignore-db，相信也会大吃一惊的。

blog地址：http://blog.csdn.net/hw_libo/article/details/40476577

-- Bosco QQ：375612082