前言：
有一個mysql學生說他們因為binlog產生太大了，需要把日志路徑放到另外的磁盤上面去，問我有啥時機的操作方案，share弄了一個mysql的binlog的日志路徑切換的例子給他。正好今天有空，就拿mysql5.6.12來做個實例，給大家演示一下。
[root@mysql5612 ~]# more /usr/local/mysql/my.cnf |grep log-bin
log-bin =/home/data/mysql/binlog/mysql-bin.log
[root@mysql5612 ~]# [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
總用量 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時間處，binlog日志mysql-bin.000053有更新記錄。然後沖洗mysql服務，看看binlog是否會重新生成：
[root@mysql5612 binlog]# service mysqld56 restart
Shutting down MySQL................. [確定]
Starting MySQL..... [確定]
[root@mysql5612 binlog]#
[root@mysql5612 binlog]# ll
總用量 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，未經過原作者黃杉(mchdba)允許，不得轉載
建立新的binlog日志路徑：
[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]# 然後修改my.cnf，設置新的log-bin路徑：
[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路徑：
[root@mysql5612 mysql]# more /usr/local/mysql/my.cnf |grep log-bin
log-bin =/home/data/mysql/binlog_new/mysql-bin
[root@mysql5612 mysql]# [root@mysql5612 mysql]# service mysqld56 restart
Shutting down MySQL.. [確定]
Starting MySQL..... [確定]
[root@mysql5612 mysql]# 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
總用量 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，錄入數據：
[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從399增大到1085，表示有新的二進制日志產生了：
[root@mysql5612 binlog_new]# ll
總用量 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工具去看下產生的新日志是否剛在建立的z3表記錄，看到有所有關於test庫建立的z3表的操作記錄，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]# 這表明我們的binlog路徑切換操作成功完成了。
