一些IT专业人士认为，重复数据删除和单实例存储（SIS）是一回事，但其实并非如此。
Some IT professionals think that deduplication and Single Instance Store (SIS) are the same thing, but they are not.
第二个问题是避免过度使用数据库或计算性资源，防止生成重复数据。
The second problem was avoiding excessive use of database or computational resources in generating duplicate data.
要修复数据库中的这个问题，您需要理解可能的原因和解决方案。
To fix this problem in the database, you need to understand the possible causes and resolutions.
在概念验证中，需要把虚拟服务器的一个完整映像从主数据中心复制或迁移到灾难恢复数据中心。
In this proof of concept, you need to copy or migrate a complete image of a virtual server from the primary data center to the disaster recovery data center.
循环日志记录通常在数据仓库环境中使用，在该环境中，恢复数据库需要的只是恢复数据库映象的问题。
Circular logging is typically used in data warehouse environments where the need to recover a database is just a matter of restoring a database image.
由于总是可以而进行完整而又精确的数据库备份，所以您可以更快地恢复数据，从而更好地遵守sla并显著降低停机成本。
Because a complete and accurate data backup is always available, you can recover data more quickly for better compliance with SLAs and for a significantly reduced cost of downtime.
不过，这种分割方式会创建重复数据。
除此之外，最大的问题是，主存储上重复数据所占的比例要比备份数据要低得多。
Beyond that, the big problem is that primary storage has a much lower percentage of duplicate data than backup data.
换句话说，在开始编写用来保存和恢复数据的代码之前，您需要确定希望保存什么数据。
In other words, you need to decide what data you want to save before you start writing the code to save and restore that data.
例如，因为服务器在运行负载时仍然可以在线修复数据库，因此用户可以收到消息。
For example, because the server can repair the database online while still under load, messages are delivered and available to the user.
不需要恢复整个数据库服务器就可以在其他实例上恢复数据。
Data can be restored without restoring the full database server on another instance.
计算机灾难发生后恢复数据是减少损失的一个好方法。
Backing up data is a great way to minimize losses after a computing catastrophe.
因此，如果用户的错误涉及DDL，那么将需要采取正确的措施来恢复数据库。
So if a user error has involved DDL, proper measures will need to be taken to bring back your database.
在信息技术中，备份数字数据的过程包括生成数字数据的多个拷贝，以便能够在需要时恢复数据。
In information technology, the process of backing up digital data consists of making multiple copies of the digital data so that the data can be restored whenever there is a need.
将最后的良好快照恢复到将用于恢复数据中心的磁盘。
Restore the last good snapshot to the disks that will be used for the recovery data center.
当ROLLFORWARD实用程序需要使用日志文件来恢复数据库时，就会检索它们。
They are retrieved when the ROLLFORWARD utility needs to use them to restore a database.
重复数据删除在备份市场已经非常流行，但是因为某些因素其在主存储上的价值一直被质疑。
Deduplication has been very popular in the backup market, but its value in primary storage is questionable for several reasons.
实现方法是创建一个压缩的符号字典，取代行级重复数据模式。
It does this by creating a compression dictionary of symbols which replace repeating data patterns at the row level.
她的职责包括进行备份、在需要时恢复数据库、进行存储管理并运行跟踪。
Her responsibilities include taking backups, restoring the database when required, storage management, and running traces.
资源管理器负责管理可恢复数据，例如文件或队列。
A resource manager is responsible for managing recoverable data, such as files or queues.
这种方法用于没有存档日志可用的不可恢复数据库。
This method is used for non-recoverable databases with no archived logs available for recovery.
另外，读者可能会对书中大量的重复数据感到厌烦。
Moreover, the reader may weary of so many repetitive statistics.
无论是自动精简配置，还是重复数据删除，在未来都会有助于提高存储的效率。
Both thin provisioning and data de-duplication will help drive storage efficiency in the future.
离线策略应用到用于备份和恢复数据库映像的机器。
An offline policy is applied to a machine that is used for backing up and restoring database images.
前一个操作符在现有文件中追加内容（所以仍然可以恢复数据），后者覆盖现有内容。
The former operator appends to the existing file (so data may still be recovered), and the latter overwrites existing content.
前一个操作符在现有文件中追加内容（所以仍然可以恢复数据），后者覆盖现有内容。
The former operator appends to the existing file (so data may still be recovered), and the latter overwrites existing content.
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