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CHAPTER 21 WHAT DO YOU MEAN, POST-RELATIONAL
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I think database means DBMS here. I also think modeling simply means representing ... Modeling is one of the most overworked words in the whole IT industry, so much so that it s almost lost what meaning it ever had (see 25 in the present book). More to the point: Object technology is no more excellent at representing complex data than the relational model is; in fact, it s worse, owing to its reliance on pointers (object IDs), which are both unnatural for most users and technically contraindicated for a variety of reasons. As for scalability, I ll discuss that issue later. [Because] objects bundle and store related data together, an object database can be partitioned across multiple machines without separating information that is closely connected. Contrast this with the relational model, in which related pieces of data are scattered among many tables. Here database means database ... ! Much more to the point, this extract demonstrates a clear lack of understanding of the relational model and relational technology. First, related pieces of data might or might not be scattered among many tables. Second, even if they are, it doesn t follow that information that is closely connected needs to be separated at the physical level. Logical vs. physical again. Objects also shine when it comes to modeling complex data realistically. Natural data relationships are maintained as part of the data itself. Data behavior is also considered part of the data itself. Transactional performance is improved because an object-based application does not have to perform cumbersome and time-consuming joins of data residing in multiple disparate tables. Several comments on this extract: Objects categorically do not shine here (as already mentioned, pointers are the fly in the ointment, or at least the main one). Natural data relationships are maintained as part of the data itself in the relational case, too (of course!). Data behavior is also considered part of the data itself the same is certainly true in the relational case for domains (the relational analog of object classes), and can be true for relations as well if desired. The suggestion that relational joins are cumbersome, even if we accept it as valid for the sake of the argument, overlooks the possibility of using the relational view mechanism or a higher-level interface to hide such joins. The suggestion that joins are time-consuming betrays a lack of understanding of the relational model and relational technology. (To say that joins are time-consuming is a solecism. Joins are part of the model, and the model per se can t be said to be either fast or slow; only implementations can be said to possess any such quality. So we might reasonably say that Product X has a faster or slower implementation of a certain specific join than Product Y does, but that s about all.) [The] richness of data types allowed by the object model can simplify the development process and decrease time to market.
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CHAPTER 21 WHAT DO YOU MEAN, POST-RELATIONAL
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What object model Where is such a thing defined More to the point, the relational model certainly doesn t preclude rich data type support if that s what you want. Domains do the necessary. The biggest obstacle to adopting object technology [meaning object database technology, presumably, from the context] is the lack of an easy and non-disruptive path from relational to object systems. Nonsense. The biggest obstacle is that object technology suffers from major technical problems. For example, did you know that objects and a good model of type inheritance are fundamentally incompatible See the book mentioned earlier, Databases, Types, and the Relational Model: The Third Manifesto, 3rd edition (Addison-Wesley, 2006), for detailed arguments in support of this position. The object/relational databases [sic] that are currently available miss out on many of the advantages of object technology, because they do not support features like inheritance and polymorphism. I m not at all convinced that the advantages claimed for object technology in this quote do truly constitute strongpoints of today s object products. Certainly I can identify problems in connection with the topics mentioned, at least as implemented in certain of today s object products. Indeed, I would argue that it can t reasonably be claimed that features like inheritance and polymorphism confer any positive advantages at all until we know exactly what those features are and, to date, a good (i.e., an abstract, formal, robust, rigorous, implementationindependent) model of those features, which would indeed explain exactly what they are, has been conspicuous primarily by its absence. Speaking from a purely personal point of view, I certainly wouldn t want to incorporate any such features into a product before I understood them! In fact, however, the same Third Manifesto book referred to a couple of times already does include a carefully designed proposal for such a model; if we can convince the IT world at large that the proposed model is indeed a good one, then but only then it might be desirable to implement it in commercial products, thereby achieving certain well-understood advantages, for certain well-understood costs. As already mentioned, I ll come back later to the question of object/relational systems in general. The database [sic] that can meet the needs of enterprise-wide information processing in the new network-centric era must include a host of advanced features ... [Here are some of them]: A multidimensional data model, so that data is not constrained to rows and columns, joins are eliminated, and performance enhanced Comment: I categorically reject these claims! The data model must be relational, for reasons already discussed above. It s not a constraint if data is represented in terms of rows and columns! Joins are eliminated : Confuses logical and physical again.1 Performance
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1. Hugh Darwen has pointed out (in a private communication) that the claim that joins are eliminated, if taken literally, means no query ever contains an and !
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