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Contribution Details
| Type | Conference or Workshop Paper |
| Scope | Discipline-based scholarship |
| Published in Proceedings | Yes |
| Title | Query Results over Ongoing Databases that Remain Valid as Time Passes By |
| Organization Unit | |
| Authors |
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| Presentation Type | paper |
| Item Subtype | Original Work |
| Refereed | Yes |
| Status | Published in final form |
| Language |
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| Page Range | 1429 - 1440 |
| Event Title | 36th IEEE International Conference on Data Engineering, ICDE 2020April 20-24, 2020 |
| Event Type | conference |
| Event Location | Dallas, TX, USA |
| Event Start Date | April 20 - 2020 |
| Event End Date | April 24 - 2020 |
| Publisher | IEEE |
| Abstract Text | Ongoing time point now is used to state that a tuple is valid from the start point onward. For database systems ongoing time points have far-reaching implications since they change continuously as time passes by. State-of-the-art approaches deal with ongoing time points by instantiating them to the reference time. The instantiation yields query results that are only valid at the chosen time and get invalidated as time passes by. We propose a solution that keeps ongoing time points uninstantiated during query processing. We do so by evaluating predicates and functions at all possible reference times. This renders query results independent of a specific reference time and yields results that remain valid as time passes by. As query results, we propose ongoing relations that include a reference time attribute. The value of the reference time attribute is restricted by predicates and functions on ongoing attributes. We describe and evaluate an efficient implementation of ongoing data types and operations in PostgreSQL. |
| Digital Object Identifier | 10.1109/ICDE48307.2020.00127 |
| Other Identification Number | merlin-id:20731 |
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