oracle数据备份

/// <summary>  
        /// 数据库备份  
        /// </summary>  
        /// <param name="fileName">dmp文件名称</param>  
        /// <param name="logFileName">log文件名称</param>  
        /// <returns>true:备份成功;false:备份失败</returns>  
        public static bool DBBackup(string dmpFileName, string logFileName)  
        {  
            // 返回值  
            bool result = false;  
            // 备份命令,从xml文件中获取 "/c EXP 用户名/密码@数据库服务名 FULL=Y INCTYPE=COMPLETE "  
            string backupCmd = MsgXml.GetConfig(XMLKey.BackupCommand.ToString());  
            // cmd中输入的参数内容  
            string arg = backupCmd + " FILE= " + dmpFileName + " LOG= " + logFileName;  
 
            try 
            {  
                // 如果dmp文件不存在，创建文件并释放  
                if (!File.Exists(dmpFileName))  
         &