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cs.DB updates on arXiv.org

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Recency-Bounded Verification of Dynamic Database-Driven S...
Parosh Aziz Abdulla, C. Aiswarya, Mohamed Faouzi Atig, Marco Mon · 2016-04-12 · via cs.DB updates on arXiv.org

We propose a formalism to model database-driven systems, called database manipulating systems (DMS). The actions of a DMS modify the current instance of a relational database by adding new elements into the database, deleting tuples from the relations and adding tuples to the relations. The elements which are modified by an action are chosen by (full) first-order queries. DMS is a highly expressive model and can be thought of as a succinct representation of an infinite state relational transition system, in line with similar models proposed in the literature. We propose monadic second order logic (MSO-FO) to reason about sequences of database instances appearing along a run. Unsurprisingly, the linear-time model checking problem of DMS against MSO-FO is undecidable. Towards decidability, we propose under-approximate model checking of DMS, where the under-approximation parameter is the "bound on recency". In a $k$-recency-bounded run, only the most recent $k$ elements in the current active domain may be modified by an action. More runs can be verified by increasing the bound on recency. Our main result shows that recency-bounded model checking of DMS against MSO-FO is decidable, by a reduction to the satisfiability problem of MSO over nested words.