Optimizing entity join queries when data transmission cost dominates

• Published in: Data & knowledge engineering Vol. 22; no. 3; pp. 283 - 308
• Main Authors: Tsai, Pauray S.M., Chen, Arbee L.P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.1997
• Subjects: Entity join; Extended semijoin; Inconsistent data; Local processing; Multidatabase; Query optimization; Query transformation; Selectivity; Inconsistent data; Multidatabase; Entity join; Local processing; Extended semijoin; Selectivity; Query transformation; Query optimization

Heterogeneities exist in a multidatabase environment. For example, a real world entity may be differently represented in relations of different databases. In particular, keys of these relations may be incompatible. In this paper, we consider processing entity join queries when data transmission cost...