IMPLEMENTATION STUDY FOR A LOCAL AREA NETWORK SCHEMA SERVER

THE PROCESSING OF USER QUERIES IN LOCAL AREA NETWORKS (LANS) WHERE MULTIPLE DATABASE MANAGEMENT SYSTEMS (DBMS) ARE BEING USED IS ADDRESSED IN THIS PROPOSAL. THE NEED EXISTS FOR A LAN FACILITY WHICH ACCEPTS QUERY INPUT FROM ANY NODE IN THE NETWORK AND PERFORMS ACCESSES AGAINST EACH APPLICABLE DBMS IN THE NETWORK TO RETRIEVE THE DESIRED DATA. IN ADDITION TO THE DEFINITION OF A COMMON NETWORK QUERY LANGUAGE, SUCH AS FACILITY REQUIRES FEATURES TO SUPPORT THE DECOMPOSITION OF NETWORK QUERIES INTO "SUBQUERIES", THE DISTRIBUTION OF SUBQUERIES TO EACH OF THE RESIDENT DBMSS WHICH CONTAIN APPLICABLE DATA, THE COLLECTION OF SUBQUERY RESPONSES, AND AGGREGATION OF SUBQUERY RESPONSES INTO A COMPOSITE QUERY RESPONSE. TO SUPPORT THESE REQUIREMENTS, A "SCHEMA SERVER" MUST BE MAINTAINED ON THE LAN WHICH PROVIDES A REPRESENTATION OF THE NETWORK SCHEMS, WHICH IS A AGGREGATE OF ALL LAN-RESIDENT DATABASE SCHEMAS. PROPOSED HEREIN IS AN IMPLEMENTATION STUDY FOR A LAN SCHEMA SERVER (LANSS) HARDWARE/SOFTWARE CAPABILITY WHICH IS BASED ON PAST RESEARCH BY AOG SYSTEMS CORPORATION INTO AN INTEGRATED DATA NETWORK (IDN) FOR ROME AIR DEVELOPMENT CENTER,AND THE DRAFT PROPOSED AMERICAN NATIONAL STANDARD (DPANS) INFORMATION RESOURCE DICTIONARY SYSTEM (IRDS).