前言：

有一个mysql学生说他们因为binlog产生太大了，需要把日志路径放到另外的磁盘上面去，问我有啥时机的操作方案，share弄了一个mysql的binlog的日志路径切换的例子给他。正好今天有空，就拿mysql5.6.12来做个实例，给大家演示一下。

1，查看binlog地址

[root@mysql5612 ~]# more /usr/local/mysql/my.cnf |grep log-bin

log-bin =/home/data/mysql/binlog/mysql-bin.log

[root@mysql5612 ~]#

2，验证binlog的正常使用

[root@mysql5612 binlog]# pwd

/home/data/mysql/binlog

[root@mysql5612 binlog]# mysql

Warning: Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 390217

Server version: 5.6.12-log Source distribution

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create table z2 select 2 as a;

ERROR 1046 (3D000): No database selected

mysql> create table test.z2 select 2 as a;

Query OK, 1 row affected (0.04 sec)

Records: 1 Duplicates: 0 Warnings: 0

mysql> exit

Bye

[root@mysql5612 binlog]# ll

总用量 6240204

-rw-rw----. 1 mysql mysql 1073742187 6月 8 2015 mysql-bin.000048

-rw-rw----. 1 mysql mysql 1073741968 6月 8 2015 mysql-bin.000049

-rw-rw----. 1 mysql mysql 1073742063 6月 8 2015 mysql-bin.000050

-rw-rw----. 1 mysql mysql 1073741957 6月 8 2015 mysql-bin.000051

-rw-rw----. 1 mysql mysql 1073742142 6月 8 2015 mysql-bin.000052

-rw-rw----. 1 mysql mysql 1021194604 12月 10 20:44 mysql-bin.000053

-rw-rw----. 1 mysql mysql 615 6月 8 2015 mysql-bin.index

[root@mysql5612 binlog]#

看到binlog日志更新了，在20:44时间处，binlog日志mysql-bin.000053有更新记录。然后冲洗mysql服务，看看binlog是否会重新生成：

[root@mysql5612 binlog]# service mysqld56 restart

Shutting down MySQL................. [确定]

Starting MySQL..... [确定]

[root@mysql5612 binlog]#

[root@mysql5612 binlog]# ll

总用量 997276

-rw-rw----. 1 mysql mysql 1021194627 12月 10 20:46 mysql-bin.000053

-rw-rw----. 1 mysql mysql 399 12月 10 20:47 mysql-bin.000054

-rw-rw----. 1 mysql mysql 82 12月 10 20:46 mysql-bin.index

[root@mysql5612 binlog]#

果然，有新的mysql-bin.000054日志生成了。

原csdn的blog地址：http://blog.csdn.net/mchdba/article/details/50254903，未经过原作者黄杉(mchdba)允许，不得转载

3，去修改binlog日志路径

建立新的binlog日志路径：

[root@mysql5612 binlog]# mkdir -p /home/data/mysql/binlog_new

[root@mysql5612 binlog]#

[root@mysql5612 binlog]# chown -R mysql.mysql /home/data/mysql/binlog_new

[root@mysql5612 binlog]#

然后修改my.cnf，设置新的log-bin路径：

[root@mysql5612 binlog]# vim /usr/local/mysql/my.cnf

log-bin =/home/data/mysql/binlog_new/mysql-bin

查看配置文件的binlog路径：

[root@mysql5612 mysql]# more /usr/local/mysql/my.cnf |grep log-bin

log-bin =/home/data/mysql/binlog_new/mysql-bin

[root@mysql5612 mysql]#

4，重启mysql服务

[root@mysql5612 mysql]# service mysqld56 restart

Shutting down MySQL.. [确定]

Starting MySQL..... [确定]

[root@mysql5612 mysql]#

5，验证新的binlog

查看生成的日志，有新的如下所示：

[root@mysql5612 mysql]# cd /home/data/mysql/binlog_new/

[root@mysql5612 binlog_new]# ll

总用量 12

-rw-rw----. 1 mysql mysql 143 12月 10 21:09 mysql-bin.000001

-rw-rw----. 1 mysql mysql 399 12月 10 21:10 mysql-bin.000002

-rw-rw----. 1 mysql mysql 90 12月 10 21:10 mysql-bin.index

[root@mysql5612 binlog_new]#

建立新表，录入数据：

[root@mysql5612 binlog_new]# mysql

Warning: Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.6.12-log Source distribution

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use test;

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 z3 select 3 as a;

Query OK, 1 row affected (0.01 sec)

Records: 1 Duplicates: 0 Warnings: 0

mysql> insert into z3 select 4;

Query OK, 1 row affected (0.00 sec)

Records: 1 Duplicates: 0 Warnings: 0

mysql> insert into z3 select 5;

Query OK, 1 row affected (0.00 sec)

Records: 1 Duplicates: 0 Warnings: 0

mysql> select * from z4;

ERROR 1146 (42S02): Table 'test.z4' doesn't exist

mysql> select * from z3;

+---+

| a |

+---+

| 3 |

| 4 |

| 5 |

+---+

3 rows in set (0.00 sec)

mysql>

再去查看binlog，mysql-bin.000002从399增大到1085，表示有新的二进制日志产生了：

[root@mysql5612 binlog_new]# ll

总用量 12

-rw-rw----. 1 mysql mysql 143 12月 10 21:09 mysql-bin.000001

-rw-rw----. 1 mysql mysql 1085 12月 10 21:11 mysql-bin.000002

-rw-rw----. 1 mysql mysql 90 12月 10 21:10 mysql-bin.index

[root@mysql5612 binlog_new]#

再使用mysqlbinlog工具去看下产生的新日志是否刚在建立的z3表记录，看到有所有关于test库建立的z3表的操作记录，如下所示：

[root@mysql5612 binlog_new]# /usr/local/mysql/bin/mysqlbinlog --base64-output=DECODE-ROWS -v mysql-bin.000002

/*!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

#151210 21:10:05 server id 72 end_log_pos 120 CRC32 0xa723f142 Start: binlog v 4, server v 5.6.12-log created 151210 21:10:05 at startup

# Warning: this binlog is either in use or was not closed properly.

ROLLBACK/*!*/;

# at 120

#151210 21:10:07 server id 72 end_log_pos 206 CRC32 0x447f5733 Query thread_id=1 exec_time=0 error_code=0

SET TIMESTAMP=1449753007/*!*/;

SET @@session.pseudo_thread_id=1/*!*/;

SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;

SET @@session.sql_mode=1075838976/*!*/;

SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;

/*!\C utf8mb4 *//*!*/;

SET @@session.character_set_client=45,@@session.collation_connection=45,@@session.collation_server=45/*!*/;

SET @@session.time_zone='SYSTEM'/*!*/;

SET @@session.lc_time_names=0/*!*/;

SET @@session.collation_database=DEFAULT/*!*/;

BEGIN

/*!*/;

# at 206

#151210 21:10:07 server id 72 end_log_pos 274 CRC32 0xde0b7250 Table_map: `access_log`.`access_log` mapped to number 70

# at 274

#151210 21:10:07 server id 72 end_log_pos 368 CRC32 0xa03a9659 Write_rows: table id 70 flags: STMT_END_F

### INSERT INTO `access_log`.`access_log`

### SET

### @1=10534

### @2=1

### @3=1449753007

### @4='[email protected]'

### @5='[email protected]%'

# at 368

#151210 21:10:07 server id 72 end_log_pos 399 CRC32 0x3ccf3c72 Xid = 3

COMMIT/*!*/;

# at 399

#151210 21:10:58 server id 72 end_log_pos 471 CRC32 0xef9ce950 Query thread_id=2 exec_time=0 error_code=0

SET TIMESTAMP=1449753058/*!*/;

BEGIN

/*!*/;

# at 471

#151210 21:10:58 server id 72 end_log_pos 593 CRC32 0x92e79f36 Query thread_id=2 exec_time=0 error_code=0

use `test`/*!*/;

SET TIMESTAMP=1449753058/*!*/;

CREATE TABLE `z3` (

`a` int(1) NOT NULL DEFAULT '0'

)

/*!*/;

# at 593

#151210 21:10:58 server id 72 end_log_pos 638 CRC32 0x65f13b58 Table_map: `test`.`z3` mapped to number 107

# at 638

#151210 21:10:58 server id 72 end_log_pos 678 CRC32 0xaa7fb7e1 Write_rows: table id 107 flags: STMT_END_F

### INSERT INTO `test`.`z3`

### SET

### @1=3

# at 678

#151210 21:10:58 server id 72 end_log_pos 709 CRC32 0x218a319c Xid = 60

COMMIT/*!*/;

# at 709

#151210 21:11:04 server id 72 end_log_pos 781 CRC32 0x9662b95e Query thread_id=2 exec_time=0 error_code=0

SET TIMESTAMP=1449753064/*!*/;

BEGIN

/*!*/;

# at 781

#151210 21:11:04 server id 72 end_log_pos 826 CRC32 0x46f32822 Table_map: `test`.`z3` mapped to number 107

# at 826

#151210 21:11:04 server id 72 end_log_pos 866 CRC32 0xafb27f1e Write_rows: table id 107 flags: STMT_END_F

### INSERT INTO `test`.`z3`

### SET

### @1=4

# at 866

#151210 21:11:04 server id 72 end_log_pos 897 CRC32 0x351c7718 Xid = 63

COMMIT/*!*/;

# at 897

#151210 21:11:10 server id 72 end_log_pos 969 CRC32 0x76931e05 Query thread_id=2 exec_time=0 error_code=0

SET TIMESTAMP=1449753070/*!*/;

BEGIN

/*!*/;

# at 969

#151210 21:11:10 server id 72 end_log_pos 1014 CRC32 0xe7e8947b Table_map: `test`.`z3` mapped to number 107

# at 1014

#151210 21:11:10 server id 72 end_log_pos 1054 CRC32 0xbdafa096 Write_rows: table id 107 flags: STMT_END_F

### INSERT INTO `test`.`z3`

### SET

### @1=5

# at 1054

#151210 21:11:10 server id 72 end_log_pos 1085 CRC32 0x831695c0 Xid = 64

COMMIT/*!*/;

DELIMITER ;

# End of log file

ROLLBACK /* added by mysqlbinlog */;

/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

[root@mysql5612 binlog_new]#

这表明我们的binlog路径切换操作成功完成了。

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