... processing in database systems with largemain memories. TODS, 1986.[44] A. Sheth and J. Larson. Federated database systems for man-aging distributed, heterogeneous, and autonomous databases.ACM ... the top focuses on the heteroge-neous nature of federated databases, without consideringany dynamic runtime issues. Heterogeneous database sys-tems present the challenge of incorporating the ... plan a join ata time. [41] propose a mechanism for a loosely coupledmulti -database system where all the underlying databasesExhaustive Heuristic Pruning Two-Phase RandomizedDynamic, Unknown...