常规使用时，RUNSTATS提供了在一段时期内有关表和索引的数据，从而随着时间的流逝，可以确定数据模型的性能趋势。
When used routinely, RUNSTATS provides data about tables and indexes over a period of time, thereby allowing performance trends to be identified for your data model as it evolves over time.
然而，很难说出哪种木制品曾经存在于某个历史时期，因为它们并不像陶器或金属器皿的使用时间长久。
However, it is not always easy to say which wooden objects existed during a historical period because they often did not last as long as objects made from clay or metal.
然而，很难说出哪种木制品曾经存在于某个历史时期，因为它们并不像陶器或金属器皿的使用时间长久。
However, it is not always easy to say which wooden objects existed during a historical period because they often did not last as long as objects made from clay or metal.
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