应用一个TL之前，您一定要先备份您当前的安装环境，然后要计划一个最坏的情况—在需要的时候将系统回滚到之前的版本。
Before applying a TL, always create a backup of you current installation, and plan on a worst case scenario-on restoring that backup if needed to rollback the system to the previous level.
在数据实际备份前根据用户定义的备份资源树和文件系统当前目录树生成一个待备份的文件列表。
Secondly, they produce the list which includes the files and directories will be backuped based on the selection tree before copy and the present catalog tree of file system.
文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。
During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.
接着在当前流行的镜像技术的基础上，描述了双机热备份系统的的基本功能，并分析了NC双机热备份系统的功能和需求。
Then based on the widely used current mirror techniques, we described some basic functions of the dual-hot-standby system, and analyzed the functions and their requirements of it in NC.
当前一些大型网络数据库管理系统（DBMS）的安全性方法主要包括：身份认证、访问控制、审计跟踪和数据备份，但对一些更为敏感和重要的数据，还需要进行数据加密或者容灾系统的设计。
The major Security methods in DBMS are as follows: identification, visiting control, trace of audit and copy of database, but as to the sensitive and important database, it needs to be coded.
笔者在深入细致地分析、比较了当前常见的双机容错热备份系统的实现方法及其性能优缺点后，提出了一种基于“层”模式的双机热备份系统解决方案。
After analyzing the main modes of the duplicated fault tolerance system currently, the author gives readers new duplicated fault tolerance system based on "layer" mode.
笔者在深入细致地分析、比较了当前常见的双机容错热备份系统的实现方法及其性能优缺点后，提出了一种基于“层”模式的双机热备份系统解决方案。
After analyzing the main modes of the duplicated fault tolerance system currently, the author gives readers new duplicated fault tolerance system based on "layer" mode.
应用推荐