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The '''MicroMICRO Relational Database Management System''' was one of the earliestfirst relationallarge-scale [[set-theoretic]] [[database management system]]s to be used in production.<ref name=Hershey1972>[httphttps://doidocs.acmgoogle.org/10.1145com/1095495.1095500open?id=0B4t_NX-QeWDYNmVhYjAwMWMtYzc3ZS00YjI0LWJhMjgtZTYyODZmNmFkNThh "A set theoretic data structure and retrieval language" (PDF)], William R. Hershey and Carol H. Easthope, PapersPaper from the Session on Data Structures, Spring Joint Computer Conference, May 1972 in ''ACM SIGIR Forum'', Volume 7, Issue 4 (December 1972), pp. 45-55, DOI=[http://doi.acm.org/10.1145/1095495.1095500, Special10.1145/1095495.1095500]</ref> InterestThough GroupMICRO onwas initially considered to be an "Information RetrievalManagement System", Associationit forwas Computingeventually Machinery,recognized Newto York,provide NY,all USA</ref>the Itcapabilities combinedof an RDBMS. MICRO's major underpinnings and algorithms were based on the [[RelationalSet-Theoretic database|relationalData model]]Structure later(STDS) mademodel famousdeveloped by [[EdgarDavid FL. Codd]]Childs|D. and [[MichaelL. StonebrakerChilds]] of the [[University of Michigan|University's CONCOMP (Conversational Use of MichiganComputers) Project.<ref name=North2010>[http://drdobbs.com/blogs/database/228700616 "Sets, Data Models and Data Independence"], by Ken North a Dr. Dobb's]] DatabaseBlogger, ResearchMarch Group10, 2010</ref><ref>[http://dxhdl.doihandle.orgnet/102027.114542/3623844163 ''Description of a set-theoretic data structure''], D.362685 "AL. RelationalChilds, Model1968, Technical Report 3 of Datathe forCONCOMP Large(Research Sharedin Conversational Use of Computers) Project, University of Michigan, Ann Arbor, Michigan, USA</ref><ref>[http://hdl.handle.net/2027.42/4164 ''Feasibility of a Set-Theoretic Data Banks"Structure : A General Structure Based on a Reconstituted Definition of Relation''], ED.F L. CoddChilds, Communications1968, Technical Report 6 of the ACM,CONCOMP volume(Research 13,in issueConversational 6Use (Juneof 1970Computers) Project, pp.77–387University of Michigan, doi=Ann 10.1145/362384.362685Arbor, Michigan, USA</ref> withMICRO featured a natural language interface which allowed non-programmers to use the system.<ref name=MICROManual1977>[https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B4t_NX-QeWDYZGMwOTRmOTItZTg2Zi00YmJkLTg4MTktN2E4MWU0YmZlMjE3 ''MICRO Information Management System (Version 5.0) Reference Manual''], M.A. Kahn, D.L. Rumelhart, and B.L. Bronson, October 1977, Institute of Labor and Industrial Relations (ILIR), University of Michigan and Wayne State University</ref><ref>[https://docs.google.com/open?id=0B4t_NX-QeWDYZGJqRVBaSEdMVnc ''MICRO: A Relational Database Management System''], Harry F. Clark, David E. Hetrick, Robert C. Bressan, July 1992, Institute of Labor and Industrial Relations (ILIR), University of Michigan, 451 pages, {{ISBN|9780877363507}}</ref>
MicroImplementation wasof originallyMICRO implementedbegan in 19681970 as part of the Labor Market Information System (LMIS) project at the University of Michigan's Institute of Labor and ranIndustrial underRelations (ILIR). Dr. Malcolm S. Cohen was Director of the LMIS Project and was the principal innovator and designer of the original MICRO Retrieval System.<ref>[[Michiganhttp://www.eric.ed.gov/ERICWebPortal/search/detailmini.jsp?_nfpb=true&_&ERICExtSearch_SearchValue_0=ED094719&ERICExtSearch_SearchType_0=no&accno=ED094719 Terminal''Feasibility of a Labor Market Information System], Volume 3, Final Report for Period July 1, 1970-June 30, 1974''], Malcolm S. Cohen, Labor Market Information System (LMIS) Project, Institute of Labor and Industrial Relations, University of Michigan, June 1974, 76 pages, PDF</ref> Carol Easthope and Jack Guskin were the time-sharingprincipal systemprogrammers. developedD.L. atChilds, UVice President of Set Theoretic Information Systems (STIS) Corporation, provided continuing guidance in the use of Set-MTheoretic Data Structure (STDS) data access software for MICRO. ItFunding becamecame from the Office of Manpower Administration within the U.S. Department of Labor.<ref name=MICROManual1977/> MICRO was first used for the study of large scalesocial relationalscience databasedata managementbases systemreferred to beas usedmicro indata; hence the productionname. Organizations such as the [[United States Department of Labor|US Department of Labor]], the [[United States Environmental Protection Agency|US Environmental Protection Agency]], and researchers from the [[University of Alberta]], the [[University of Michigan]], and [[Wayne State University]], usedthe it[[University toof manageNewcastle veryupon largeTyne]], scaleand databases.[[Durham MicroUniversity]] used continuedMICRO to runmanage invery productionlarge scale databases until 1998.
MICRO runs under the [[Michigan Terminal System]] (MTS), the interactive time-sharing system developed at the University of Michigan that runs on [[IBM System/360 Model 67]], [[System/370]], and compatible mainframe computers.<ref>[http://babel.hathitrust.org/cgi/pt?view=image;size=100;id=mdp.39015014920717;page=root;seq=5 "Chapter 6: MICRO" in ''Introduction to database management systems on MTS''], Rick Rilio, User Guide Series, Computing Center, University of Michigan, March 1986, pages 147-189</ref> MICRO provides a query language, a database directory, and a data dictionary to create an interface between the user and the very efficient proprietary Set-Theoretic Data Structure (STDS) software developed by the Set-Theoretic Information Systems Corporation (STIS) of Ann Arbor, Michigan. The lower level routines from STIS treat the data bases as sets and perform set operations on them, e.g., union, intersection, restrictions, etc. Although the underlying STDS model is based on set theory, the MICRO user interface is similar to those subsequently used in [[relational database management systems]].<ref name=North2010/><ref>[https://dx.doi.org/10.1145/362384.362685 "A Relational Model of Data for Large Shared Data Banks"], E.F. Codd, Communications of the ACM, volume 13, issue 6 (June 1970), pp. 77–387, doi= 10.1145/362384.362685</ref> MICRO's data representation can be thought of as a matrix or table in which the rows represent different records or "cases", and the columns contain individual data items for each record; however, the actual data representation is in set-theoretic form. In labor market applications the rows typically represent job applicants or employees and columns represent fields such as age, sex, and income or type of industry, number of employees, and payroll.<ref name=Hershey1972/>
== References ==
MICRO permits users with little programming experience to define, enter, interrogate, manipulate, and update collections of data in a relatively unstructured and unconstrained environment.<ref name=MICROManual1977/> An interactive system, MICRO is powerful in terms of the complexity of requests which can be made by users without prior programming language experience.<ref>"[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2581360/pdf/procascamc00021-0314.pdf Use of a Relational Database to Support Clinical Research: Application in a Diabetes Program]", Diane Lomatch, M.P.H., Terry Truax, M.S., Peter Savage, M.D., Diabetes Center Unit, MDRTC, University of Michigan, 1981</ref> MICRO includes basic statistical computations such as mean, variance, frequency, median, etc. If more rigorous statistical analysis are desired, the data from a MICRO database can be exported to the Michigan Interactive Data Analysis System (MIDAS),<ref>[http://babel.hathitrust.org/cgi/pt?id=mdp.39015004498013;page=root;view=image;size=100;seq=3;num=i ''Documentation for MIDAS''], Daniel J. Fox and Kenneth E. Guire, Third Edition (September 1976), Statistical Research Laboratory, University of Michigan, 203 pp.</ref> a statistical analysis package available under the Michigan Terminal System.<ref>"[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2245120/pdf/procascamc00019-0674.pdf Converting from Traditional File Structures to Database Management Systems: A Powerful Tool for Nursing Management"], Yvonne Marie Abdoo, Ph.D., R.N, Wayne State University College of Nursing, 1987</ref>
== External linksReferences ==
[http://www.eecs.umich.edu/db/ University of Michigan Database Research Group]
[[Category:Proprietary database management systems]]
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