只有存储在字典视图中的统计信息，才会被优化器使用。
Only statistics stored in the dictionary itself have an impact on the cost-based optimizer.
在编辑器的左侧，会看到一个字典视图，其中包括每一个术语及其变体的一个示例。
On the left side of the editor, you can see a view of the dictionary, including each term and a sample of its variants.
数据字典视图可以被分为多组。大多数情况下，一组视图由三个包含相似信息的视图构成，其中的区别在于视图名称的前缀。
The data dictionary consists of sets of views. In many cases, a set consists of three views containing similar information and distinguished from each other by their prefixes.
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