Default-all is dangerous!

Details Default-all is dangerous! Default-all is dangerous!

2011-05-23

arxiv.org/abs/1105.4395v1

Computer Science

Databases

4 pages, 6 figures, preprint of paper appearing in Proceedings of TaPP '11 (3rd USENIX Workshop on the Theory and Practice of

Scientific paper

We show that the default-all propagation scheme for database annotations is dangerous. Dangerous here means that it can propagate annotations to the query output which are semantically irrelevant to the query the user asked. This is the result of considering all relationally equivalent queries and returning the union of their where-provenance in an attempt to define a propagation scheme that is insensitive to query rewriting. We propose an alternative query-rewrite-insensitive (QRI) where-provenance called minimum propagation. It is analogous to the minimum witness basis for why-provenance, straight-forward to evaluate, and returns all relevant and only relevant annotations.

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