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APPENDIX THE ROLE OF THE TRADE PRESS IN EDUCATING THE PROFESSIONAL COMMUNITY
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taken as criticisms of today s products; however, they are not accurate if they are taken as criticisms of the potential of the technology. Relational vendors should do everything in their power to extend their systems to include proper domain support. Indeed, you can make an argument that the whole reason we are getting into this debate on the relative merits of object-oriented and relational is precisely because the relational vendors have failed so far to support the relational model adequately. But this fact shouldn t be an argument for abandoning relational entirely. It would be a great shame to walk away from the experience gained from more than 20 years of solid relational research and development.
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Charles Babcock s Commentary column from Computerworld ( Relational Backlash, June 28th, 1993): You know that what used to be the younger generation isn t so young any more when its leaders start taking shots at the talent coming up behind them. That s what s happening now with some of the proponents of relational databases as they train their sights on object database management systems (ODBMS). This is strange because at one time, the hoary guardians of hierarchical and Codasyl systems said the same sort of things about relational. John Cullinane, president of the late Cullinet Software, used to tell me, IBM may ship a lot of copies of DB2 but they re all sitting on the customers shelves. Right. Cullinet was acquired by Computer Associates about a year later. Once again, you can hear the volume of disparaging comments beginning to pick up: You don t need object-oriented systems. Relational can do everything they can do ... You can store unstructured data in relational tables ... Object-oriented results in a loss of data independence, not a gain. And so on. It is hard for relational advocates, having been on the leading edge for 10 to 12 years, to wake up and find that fashionable opinion has moved on to something else. The temptation is to tell the upstarts they don t know what they re talking about. At their worst, the relational defenders say ODBMSs represent a step backward. ODBMSs resemble the old Codasyl databases with their dependence on pointers to locate stored objects, but it is hard to see this as a vice if the systems then manage objects effectively. Object databases answered a real need for C++ and Smalltalk programmers who needed a place to store their persistent data. CAD and CAE users in particular sought to store objects, and object-oriented databases sprang up to serve that purpose. Whatever their deficiencies, ODBMSs succeed in dealing with objects as objects. They do not need to break them down or flatten them as relational systems do. There are a variety of methods used, but the chief one is to assign each object its own identifier and then use that identifier to locate the object intact. The nature of this system gives object databases a claim to speedier retrieval because there is no mathematical basis on which to do more sophisticated operations such as joins. Clearly relational systems would retain advantages in dealing with massive amounts of tabular data. But relational advocates are reluctant to give object databases their due. ODBMSs are built as object-handling systems capable of preserving the characteristics of the objects they store classes, inheritance and messaging.
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Because objects are a combination of data, processes and messages, it is difficult to restrict them to a few simple data types. To store an object, you have to have the processes inside the database as well as the data, notes James Odell, chief methodologist at Inference Corp. and co-author with James Martin of Principles of Object-Oriented Analysis and Design. Relational systems can store objects, but to do so, they must break them down into components and store them in tables. In an analogy that originated with Esther Dyson, editor of the newsletter Release 1.0, this is like driving your car home and then disassembling it to put it in the garage. It can always be reassembled again in the morning, but one eventually asks whether this is the most efficient way to park a car. Relational systems were designed to deal with a few data types within the confines of a strict logic. Object databases were designed to deal with the rich variety of data types in a few limited ways. Relational advocates can t wave a magic wand and make the difference go away.
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