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。
<code class=" hljs mel">[root@mysql5612 ~]# more /usr/local/mysql/my.cnf |grep log-bin log-bin =/home/data/mysql/binlog/mysql-bin.log [root@mysql5612 ~]#
<code class=" hljs applescript">[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：
<code class=" hljs css">[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
建立新的binlog日志路径：
<code class=" hljs ruby">[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：
<code class=" hljs ruby">[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：
<code class=" hljs ruby">[root@mysql5612 mysql]# more /usr/local/mysql/my.cnf |grep log-bin log-bin =/home/data/mysql/binlog_new/mysql-bin [root@mysql5612 mysql]#
<code class=" hljs ruby">[root@mysql5612 mysql]# service mysqld56 restart Shutting down MySQL.. [确定] Starting MySQL..... [确定] [root@mysql5612 mysql]#
查看生成的日志，有新的如下所示：
<code class=" hljs perl">[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：
<code class=" hljs applescript">[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：
<code class=" hljs haml">[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：
<code class=" hljs vala">[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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