System time tracks when changes are made to the state of the table, such as when an insurance policy was modified.

系统时间跟踪更改表状态的时间，比如一个保险政策更改的时间。

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Defining a table with a system time period instructs DB2 10 to automatically capture changes made to the state of the table and to save the "old" rows in a history table.

定义一个包含一个系统时间区间的表将指示DB 2 10自动捕获表状态更改并将“旧”行存储在一个历史表中。

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After researching the workflow management system using situation calculus theory, expands formally the LR from state-object to state-table-set-object.

以情景演算理论为基础来研究工作流管理系统，形式化地将LR的状态对象扩展为状态表集合对象。

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