默认情况下，Slice会跨所有的活动片执行查询并在需要的时候在内存中合并结果。

By default, slice executes a query across all active slices and consolidates the result if necessary in memory.

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而另一方面，用户应用程序将需要位于底层片上的信息以及某种程度的控制，比如，将某些查询指向活动片的某个特定的子集。

On the other hand, the user application will require information on the underlying slices as well some degree of control, for example, to target some queries to a specific subset of active slices.

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包含大量活动和相关数据的过程需要更小的事务片。

Processes with a lot of activities and related data require smaller transaction slices.

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