RETENTION parameter works best if the current undo tablespace has enough space for the active transactions.

retention能做好地工作如果——当前的回滚表空间对活动事务有足够的空间。

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If this parameter is enabled, log retention logging is performed regardless of how the logretain parameter is set.

如果启用了该参数，无论logretain参数如何设置，都会执行日志保留记录。

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Retention time distribution (RTD) is an important parameter of polymer in the extruding process.

停留时间分布(rtd)是表征聚合物挤出过程重要的参数。

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