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DBC Handbook
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DBC Software Requirement for Supporting Relational Databases
This is the final report of a series of work aimed at demonstrating the capabilities of a back-end database computer (DBC) in supporting known data models and systems. In the previous two reports, it was shown that existing hierarchical and network database management systems, in particular, the Information Management System (IMS) of IBM and DMS1100 of UNIVAC, can be supported on the DBC with a vastly improved performance. In this final report, we study a relational database management system, namely System R, with a view to supporting such a system on the DBC. The early sections of this report are introductory in nature. The representation of relational tuples in the DBC is quite straightfo...
Meanwhile in Dopamine City
***Shortlisted for the Goldsmiths Prize 2020*** FROM THE BOOKER PRIZE-WINING AUTHOR OF VERNON GOD LITTLE 'Pierre's high-risk prose explores and expands the cartoonish, taboo-busting outer edges of literary possibility.' -- Independent *** It's a big bad world out there, in Dopamine City. All Lonnie Cush wants is to keep his kids safe. But Shelby-Ann - his little girl, the maddening apple of his eye - has other ideas: Shelby-Ann wants her first smartphone. So new realities are rocketing their way to 37 Palisade Row, where everything will change, every day, and at mortal speed. Until Lonnie finds himself in a stitch: he'll have to join this new world, or wither in it. Or can he mastermind a vanishing act? The story of a hapless father's love and loss, and a speedball, starburst satire, Meanwhile in Dopamine City is a passionate, freewheeling work from the winner of the Booker Prize: a riotous cry for the soul and the flesh and the heart in the cooling bathwater of our automatic times.
Simulation Studies of the Database Computer (DBC).
This report consists of a series of simulation studies of the hardware throughput of a specialized machine known as the database computer (DBC). Although raw hardware performance of the DBC can be estimated in an order of 80 to 160 times that of conventional software-oriented database management systems, there is the need of knowning the DBC's response time to user access requests, load condition to various request types, and potential bottlenecks which may be caused by uneven performance matching of the key DBC components. The simulation studies are intended to address the need. The simulation programs are written in GPSS and run on an IBM 370/168. All of these results are plotted in graph form. Prediction of the results, interpretation of the graphs, and observation of the deviations are the main effort of the simulation studies. Very good conclusions are obtained concerning the DBC's response time, load condition, and throughput bottleneck. (Author).
DBC Software Requirements for Supporting Network Databases
This is the second of a series of reports aimed at studying the capabilities of a database computer, known as the DBC, in supporting the three major data models: hierarchical, network and relational. In the first report, DBC software requirements for handling hierarchical databases have been presented. This report will be directed towards an investigation of the software requirements for network databases. Relational database systems will be treated in a forthcoming report. The April 1971 report of the CODASYL database Task Group (DBTG) is chosen as the definitive document of network databases and systems since most commercially available network data base management systems are based on the...
DBC
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DBC Software Requirements for Supporting Hierarchical Databases
This report shows the capability of the database computer (DBC) for supporting hierarchical data models and systems. Since IBM's Information Management System (IMS) is the most widely used data management system which supports a hierarchical view of data, we intend to show that the DBC can support IMS databases and IMS application programs. Furthermore, this study provides us with a case for comparing the merits of using a conventional general-purpose computer versus a special-purpose database computer (i.e., the DBC) for data management. It is shown that it is possible to design an interface, known as IMSI between IMS users and the DBC. The IMSI can faithfully execute the DL/1 calls (the da...
