backups

We don't see this as much of a headache, because data backups should be performed regardless of whether you're switching to a new OS.

我们不认为这些操作过于让人头痛，因为无论切换到新操作系统与否，数据备份都应该进行。

For a delta backup, you need to maintain all the backups taken since the last full backup in order to be able to reconstruct the data.

对于差异备份，需要维护自上次完全备份以来采取的所有备份，以便能够重构数据。

Keeping incremental backups of the system's important (and user) files is an important way of preventing this sort of disaster.

保存系统中重要（以及用户）文件的增量备份是防止这种灾难出现的一种重要方法。

For data and differential backups ( and for log backups containing bulk-logged operations ) , roll forward must go at least up to this LSN.

对于数据备份和差异备份（以及包含大容量日志操作的日志备份），必须至少前滚到此LSN。

Testing your strategy by restoring a set of backups and recovering your database prepares you to respond effectively to a disaster.

通过还原一组备份并恢复数据库来测试您的策略，为有效地应对灾难做好准备。

As a DBA, it is often necessary for you to create backups of databases.

DBA常常需要创建数据库的备份。

with log backups , you can recover the database to the point of failure or to a specific point in time.

使用事务日志备份，可以将数据库恢复到故障点或特定的时间点。

Log backups on the different databases can be created independently of each other and do not have to be simultaneous.

可以对不同的数据库独立创建各日志备份，而无需同时创建。

In the case of a failure on Saturday, you could restore the first Sunday full backup and apply the delta backups from Monday until Saturday.

在星期六出现失败的情况下，您可以恢复第一个星期天的完全备份，并应用星期一到星期六的delta备份。

Backups at each stage of your migration enable you to rollback to a specific point in time of your migration process.

通过在迁移的每个阶段都进行备份，您可以回滚到迁移过程中的任何特定时点。

With transaction log backups, you can recover the database to the point of failure or to a specific point in time.

有了事务日志备份，您就可以将数据库恢复到故障发生时刻或某个特定时刻的状态。

For this reason, do not use disk mirroring as a substitute for keeping current backups of important data on your servers.

由于这个原因，请不要使用磁盘镜像来代替对服务器上重要的数据进行及时的备份。

Note that this option is only possible with offline backups and no rollforward is possible.

注意，该选项仅适用于离线备份，不支持前滚。

The reason so many backups are necessary is to enable you to easily go back to any step in your cell migration, should the need arise.

之所以需要如此多的备份，是因为它们可以在您需要时让您轻松返回计算单元迁移中的任何步骤。

These backups can be sent to tape (local or remote), to disk, or to a pipe that makes ontape quite flexible.

这些备份可以发送到磁带（本地或远程）、磁盘或使ontape非常灵活的管道。

Terracotta is designed with total HA in mind (n+m redundancy--as many backups as you want, continuous upgrades with no downtime, etc. ).

Terracotta设计时就考虑了全面的HA（n+m冗余度——你可以有任意多的备份，不停机的持续升级，等等）。

After you restore backups for one of these recovery paths, the alternative recovery paths are no longer valid .

恢复了某个恢复路径的备份之后，备用恢复路径便不再有效。

However , with such limited backups , you may not be able to recover all the data and information that existed on the original server .

但是，使用如此有限的备份，可能无法恢复原始服务器上存在的所有数据和信息。

That is, an unbroken sequence of transaction log backups must extend up to the point of failure.

也就是说，事务日志备份的连续序列必须能够延续到故障点。

The sequence of data and log backups that have brought a database to a particular point in time , known as a recovery point .

使数据库到达特定时间点（称为恢复点）的一组数据和日志备份。