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APPENDIX 4 SAMPLE DISTRIBUTED DBMS PROJECTS AND PROTOTYPES MULTIBASE Computer Corporation of America. Read-only queries. Does not support concurrency control and transaction management. Heterogeneous system. DOTS (Distributed Data Base Testbed System) Honeywell research prototype. Five-level schema architecture, specified using the Entity-Category-Relationship (ECR) model. Supports concurrency control and transaction management. Heterogeneous system. SIRIUS-DELTA French research project. Limited transparency. Essentially a frame- work for cooperating data base systems. Heterogeneous system capability. DDM/ADAPLEX Computer Corporation of America. High degree of transparency. Adaplex interface language has the data base sublanguage DAPLEX embedded in general-purpose programming language Ada. Project sponsored by DARPA and NAVELEX. SDD-1 Computer Corporation of America research project (1978). Addresses DDB problems of concurrency, recovery, consistency, fragmented data, redundant copies. DISTRIBUTED 204 Computer Corporation of America commercial product resulting from SDD-1 research system. R* IBM Research follow-on to System R which led to DB2. Multiple cooperating copies of System R on IBM mainframes, advanced catalog management. Reportedly has moved out of research and into development recently. DISTRIBUTED INGRESS Researched at Berkeley; commercial product of Relational Technologies, Inc. Supports abstract data types and indices to CAD data. IISS (Integrated Information Support System) GE as prime contractor, plus 10 subcontractors involved in construc- tion of test bed that will migrate to an integrated heterogeneous distributed system for factories. USAF/Wright-Patterson sponsor. 92
93 PROTEUS Research project involving several British universities. Initial prototype has star configuration with switch at center and front-end interfaces at distirubted nodes. A heterogeneous distributed data base system. CSIN (The Chemical Substances Information Network) Designed and implemented by Computer Corporation of America. Interconnects heterogeneous systems. Somewhat limited; not fully integrated. Global model does not include all data in component data bases. ICAM/PDDI (Integrated Computer-Aided Manufactring/Product Definition Data Interface) McDonnell Douglas contract with USAF/Wright-Patterson. Major emphasis on definition of long-range manufacturing needs and a prototype demonstration of PDDI. Employs IDEF methodology for data definition. IDS (Integrated Design Support System) Charter is to assemble off-the-shelf tools and to add technology to manage technical data for the B-1B aircraft. Rockwell prime contractor with DACOM, SDRC and CCA for USAF/Wright-Patterson. EXPERT SYSTEMS RESEARCH RELEVANT TO IDB For example, ongoing work at Carnegie-Mellon.
