| 摘要 |
Disclosed is an apparatus, method, and program product for performing time-based queries using an enhanced conventional (called Unitemporal herein) Data Management System (DMS). A user is able to specify a date and time of day as part of a query, and the disclosed DMS will query stored data and return query results that reflect the data as it appeared on the date and at the time specified in the query. The time-based query capability is accomplished by using database journal information to reconstruct the data as of the specified effective time.
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