Nrows - Number of rows in the table.
nrows -表中的行数。
npused - Number of pages used to store 'nrows' of Tupule
npused - 用于存储 Tupule 的 ‘nrows’ 的页数
Statistics have been updated, and not only is nrows populated but we also see when statistics were last updated.
统计信息已被更新,不但填充了 nrows,而且我们还看到统计信息最终被更新了。
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