The number of distinct values of index keys in remote indexes

远程索引中不同索引键值的个数

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An entry is added to the system catalog to indicate to the query optimizer that such a remote index exists.

一个条目被添加到系统编目中，以向查询优化器表明存在那样的一个远程索引。

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It is also possible that a remote index is added to the remote object on the data source after the creation of the nickname.

在昵称创建后，可能会添加一个远程索引到数据源上的远程对象。

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