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This article presents and discusses the computation and communication model used by R*, a prototype distributed database management system. An R* computation consists of a tree of processes connected by virtual circuit communication paths. The process management and communication protocols used by R* enable the system to provide reliable, distributed(More)
System R supports a high-level relational user language called SQL which may be used by ad hoc users at terminals or as an embedded data sublanguage in PL/I or COBOL. Host-language programs with embedded SQL statements are processed by the System R precompiler which replaces the SQL statements by calls to a machine-language access module. The precompilation(More)
This repon has been submitted for publication outs~de o vl and will probably be cooyrtghted if accepted for publicatlo has been issued as a Research Report for early dissemcnation of its contents. In view of the transfer of copyright to the outside publisner, its distrtbution outside of ISM orlor ro oublication mould be limited to oeer communications and(More)