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Ongoing time point now is used to state that a tuple is valid from the startpoint onward. For database systems ongoing time points have far-reachingimplications since they change continuously as time passes by. State-of-the-artapproaches deal with ongoing time points by instantiating them to the referencetime. The instantiation yields query results that are only valid at the chosentime and get invalidated as time passes by. We propose a solution that keepsongoing time points uninstantiated during query processing. We do so byevaluating predicates and functions at all possible reference times. Thisrenders query results independent of a specific reference time and yieldsresults that remain valid as time passes by. As query results, we proposeongoing relations that include a reference time attribute. The value of thereference time attribute is restricted by predicates and functions on ongoingattributes. We describe and evaluate an efficient implementation of ongoingdata types and operations in PostgreSQL.

Query Results over Ongoing Databases that Remain Valid as Time Passes By (Extended Version)