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Guide Relational and object-oriented databases

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On the other, Object Design's cross-town rival, Ontos, was recently forced to reorganize its management team and focus on making what the Aberdeen Group, a Boston based consulting firm, calls Object-Relational Enablers OREs - a class of product that lets object databases co-exist with relational databases, not replace them.

Ontos wasn't alone. Other products following the ORE approach appeared last year from dozens of companies. Even forthcoming operating systems from Microsoft, Apple, and IBM employ object oriented technology to enable enterprise-wide, distributed computing across systems that can include relational databases. Meanwhile, the relational database companies themselves are not standing still. Some are offering hybrid products that combine relational and OO features. Progress Software Corporation Burlington, MA , has added a front end to its database system, allowing it to handle OO-structured data within relational tables.

Newcomer Illustra Information Technologies Oakland, CA , offers a genuine OO database - except that it talks SQL the standard relational database interface language even though it stores objects directly rather than as relational tables. Other database vendors prefer to downplay the OO approach altogether in favor of adding raw performance enhancements to their flagship relational products - features which greatly enhance the products' competitive positions relative not only to other relational database systems, but also to substitute technologies - among them OO database systems.

Object Design's largest corporate investor is IBM. Yet, in early , the computer giant will announce DB2 parallel edition - its entry into the parallel Unix market. The product will provide table partitioning and parallel support for the full range of database functions, including sorts, indexing, and utilities. In late , Informix Menlo Park, CA announced its own parallized database engine, allowing users to perform concurrent sorts, indexes, and backup-and-restore functions. Even before such performance enhancements are considered, relational databases yield impressive performance.

Relational and Object-oriented Database Management Systems Essay

Users seem to have three choices - they can stick with the established, performance-optimized relational databases, opt for the emerging but still untested capabilities of object oriented database systems, or take a middle path by buying a hybrid database or some other variant of the ORE-style solution. For the third option, we prefer to use the word "inclusive" - as the term more aptly suggests the need to combine technologies where appropriate without presupposing what that might mean in a particular application domain. One of the newer arenas in the database battle is document management.

This is an interesting development. It wasn't that long ago that documents were things you simply stored in files and retrieved in one piece when you wanted to display or print them. The whole notion of documents as data is relatively new. With the acceptance of sophisticated encoding languages, such as SGML Standard Generalized Markup Language , it is now possible for high-end publishing and document storage and retrieval systems to break down documents into components tables, figures, text blocks, etc.

Those items can later be selectively retrieved, published as a whole document or combined and recombined to produce a variety of products. The advantages of storing documents as information are compelling.

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Complex and physically large documents, such as legal research reports, pharmaceutical catalogs, and equipment maintenance manuals are more useful if the information they contain can be accessed randomly as in a database. Material need not always be presented in the same sequence or include the same information. Interested in carburetors? Now all the information on carburetors in your repair manuals can be presented as a single "package. Want the information delivered on CD instead of paper? Now you can publish the same document without page breaks, and even include hyperlinks, sound and live action video.

Do many of the engines in your product line share parts in common? Now you can store only one copy of redundant text for all the documents that use it. The power to mix and match document content requires that document management systems see documents as compilations of objects, such as paragraphs, graphics, chapters, and books. Value-added information can be included in these objects e. For example, objects can be tagged to show which product configuration the information pertains to.

According to an object oriented view, a paper document is merely one instance of how a document's components are rendered. What is much more important is how that information is organized and stored. Which brings us back to the database question.

Because high-end document management systems treat the components of documents as objects, should not the document databases that support documents be object oriented? Well, no.


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At least not yet. The performance advantages of relational databases are simply too overwhelming, as are the investments that user organizations have already made in relational technology. The view of computing that seems to have emerged in the s is quite different from the "us-versus-them" mentality of the late 80s. If only from habit, it is difficult to overcome the urge to view technologies as if they were competing companies, and to expect the newest technology will always win. But as technology has become more powerful, the us-versus-them paradigm no longer dominates our lives - for two reasons.

First, technology is now too important to be left in the hands of the technologists alone. By being well acquainted with the relational model and by noting the similarities and differences between the two approaches to data modeling, designers will be able to turn into account and to make use of the already acquired experience as an important basis for under-standing and learning the methodology of designing object oriented databases.

Comparison Between Object-Relational and Object-Oriented Database[2]: The author of this paper discuss some concepts related to the object-relational and object- oriented database system such as object identity, user defined types UDTs , user-defined routines, polymorphism, subtypes and super types, persistent stored modules, and large objects. The queries executed and specifically on an object oriented database DB4o. This disadvantage is seen as significant drawback and is compared to pre-relational system.

Object-Relational Databases

There is no standard Object Oriented Query Language. These applications include computer aided design, engineering, software engineering and manufacturing systems CAD, CAE, CASE, and CAM ; knowledge based systems multimedia systems that manage images, graphics, voice, and textual documents; statistical and scientific modeling and analysis programs; information systems; and so on. However, objects oriented technology, which is the fundamental advancement in database technology, satisfies the objective of reducing the difficulty of designing and implementing very large and complex database requirements.

Roopak, K. Rao, S. Ritesh and S. Landis, J. Orenstein and D. Weinreb, The object store database system. ACM, ODBMS vs. Mylopoulos and J.

Object-Relational DBMS

Schmidt, On Conceptual Modeling. Bancilhon, D. DeWitt, K. Maier and S. Zdonik, First Intl. Kemnitz, The postgres next generation database management system.


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  5. Jensen and S. Agarwal, Persistence software: Bridging object-oriented programming and relational databases. Email Address. Sign In. Access provided by: anon Sign Out. Supporting data migration between relational and object-oriented databases using a federation approach Abstract: Data migration between relational and object-oriented database systems is useful whenever relational data is needed in new object-oriented environments. However, implementing migration programs, i.