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.

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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.

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不过，这种分割方式会创建重复数据。

However, this kind of shredding creates duplicate data.

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