The RUNSTATS utility updates statistics in the system catalog tables to help with the query optimization process.

RUNSTATS 实用程序用于更新系统目录表中的统计信息，以帮助查询优化过程。

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Of course, you cannot explicitly create or drop these system catalog tables, but you can query and view their content.

当然，不能显式地创建或删除这些系统编目表，但是可以查询和显示这些表的内容。

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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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