这是因为，当然，简单来说就是数据库增量备份的问题。
This is, of course, simply the incremental database backups problem.
解决D PF备份和恢复问题。
还可以有相同的虚拟机备份，原先的进程有问题另外一个可以接上。
They can have an identical twin which takes over should the original fail.
数据库系统的备份与恢复部分正是要解决这些问题。
The part of backup and recovery in DBMS is to solve these problems.
命令行问题：命令行上没有指定有效的备份操作。
Command line Problem: a valid backup operation was not specified on the command line.
针对碰到问题的少数用户，备份总是必要的。
For the few users that run into a problem, there would still be a backup.
从你的备份中恢复数据库可以在你遇到问题时使用。
Restoring your database from backup is then possible if something goes wrong.
在校园网站的管理工作中要注意分工协作、用户培训、安全防护和数据备份等问题。
Also we must pay attention to division and cooperation, user training, safe protection and dat...
在校园网站的管理工作中要注意分工协作、用户培训、安全防护和数据备份等问题。
Also we must pay attention to division and cooperation, user training, safe protection and dat...
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