根据资料上说，备份数据库的语法如下：

mysqlbackup -u<user> -p<password>

--_dir=<backup-dir> backup-and-apply-log

具体我执行的时候，老是报错：

[root@sztech1 ~]# mysqlbackup -u root -p --backup_dir=/backup backup-and-apply-log

 Enterprise Backup version 3.11.0 Linux-3.8.13-16.2.1.el6uek.x86_64-x86_64 [2014/08/26]  Copyright (c) 2003, 2014,  and/or its affiliates. All Rights Reserved.

mysqlbackup: INFO: Starting with following command  ...

mysqlbackup -u root -p --backup_dir=/backup -and-apply-log

mysqlbackup: INFO: 

Enter password:  141206 01:55:16 mysqlbackup: WARNING: Can not establish connection to mysql server. Connection open fails with error "Can't connect to local MySQL server through socket '/tmp/.sock' (2)" mysqlbackup: ERROR: Connection initialization error.

 failed with errors!

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