Automatically assigned DDC number: 00574

Manually assigned DDC number: 00574

Number of references: 32

Title: View-based Query Processing and Constraint Satisfaction

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Subject: Diego Calvanese,Maurizio Lenzerini,Moshe Y. Vardi View-based Query Processing and Constraint Satisfaction

Description: View-based query processing requires to answer a query posed to a database only on the basis of the information on a set of views, which are again queries over the same database. This problem is relevant in many aspects of database management, and has been addressed by means of two basic approaches, namely, query rewriting and query answering. In the former approach, one tries to compute a rewriting of the query in terms of the views, whereas in the latter, one aims at directly answering the query based on the view extensions. We study view-based query processing for the case of regular-path queries, which are the basic querying mechanisms for the emergent field of semistructured data. Based on recent results, we first show that a rewriting is in general a co-NP function wrt to the size of view extensions. Hence, the problem arises of characterizing which instances of the problem admit a rewriting that is PTIME. A second contribution of the work is to establish a tight connection betwe...

Contributor: The Pennsylvania State University CiteSeer Archives

Publisher: unknown

Date: 2000-06-12

Pubyear: 2000

Format: ps

Identifier: http://citeseer.ist.psu.edu/317766.html

Source: http://www.cs.rice.edu/~vardi/papers/lics00.ps.gz

Language: en

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