Runstat —— 收集优化器所使用的统计数据

Runstat - collects statistics used by optimizer

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相反，优化器将对查询中引用的每个数据库表收集最新的统计数据。

Instead, the optimizer gathers up-to-date statistics on every database table referenced in a query.

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为那些没有统计或者只有些陈旧统计数据的模式对象收集最优化的统计数据。

Automatic optimizer statistics collection-collects optimizer statistics for all schema objects in the database for which there are no statistics or only stale statistics.

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