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Communication Dans Un Congrès Année : 2014

Enumerating answers to first-order queries over databases of low degree

Résumé

A class of relational databases has low degree if for all delta, all but finitely many databases in the class have degree at most n^delta, where n is the size of the database. Typical examples are databases of bounded degree or of degree bounded by log n. It is known that over a class of databases having low degree, first-order boolean queries can be checked in pseudo-linear time, i.e. in time bounded by n^(1+epsilon), for all epsilon. We generalise this result by considering query evaluation. We show that counting the number of answers to a query can be done in pseudo-linear time and that enumerating the answers to a query can be done with constant delay after a pseudo-linear time preprocessing.

Dates et versions

hal-01070898 , version 1 (02-10-2014)

Identifiants

Citer

Arnaud Durand, Nicole Schweikardt, Luc Segoufin. Enumerating answers to first-order queries over databases of low degree. Proceedings of the 33rd ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS'14, Snowbird, UT, USA, June 22-27, 2014, Jun 2014, Snowbird, United States. pp.121--131, ⟨10.1145/2594538.2594539⟩. ⟨hal-01070898⟩
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