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Topic: Comparison of relational database management systems

 Why Aren't You Using An Object Oriented Database Management System?
Database operations typically involve obtaining a database root from the the OODBMS which is usually a data structure like a graph, vector, hash table, or set and traversing it to obtain objects to create, update or delete from the database.
In a relational database this has to be done either by having one huge table with lots of null fields or via a number of smaller, normalized tables which are linked via foreign keys.
Thus applications that use RDBMS systems usually have an Entity Relationship diagram to model the static parts of the system and a seperate model for the operations and behaviors of entities in the application.
www.25hoursaday.com /WhyArentYouUsingAnOODBMS.html   (2830 words)

 Database Models: Hierarcical, Network, Relational, Object-Oriented, Semistructured, Associative and Context.   (Site not responding. Last check: 2007-11-03)
In contrast to a relational DBMS where a complex data structure must be flattened out to fit into tables or joined together from those tables to form the in-memory structure, object DBMSs have no performance overhead to store or retrieve a web or hierarchy of interrelated objects.
In such database there is no clear separation between the data and the schema, and the degree to which it is structured depends on the application.
Such databases subsume the modelling power of recent extensions of flat relational databases, to nested databases which allow the nesting (or encapsulation) of entities, and to object databases which, in addition, allow cyclic references between objects.
www.unixspace.com /context/databases.html   (2376 words)

 Object-Relational DBMSs - The Road Ahead
A relational database is composed of many relations in the form of two-dimensional tables of rows and columns containing related tuples.
In relational databases, relationships among tuples are specified by attributes having the same domain.
The ORDBMS has the relational model in it because the data is stored in the form of tables having rows and columns and SQL is used as the query language and the result of a query is also table or tuples (rows).
www.acm.org /crossroads/xrds7-3/ordbms.html   (2037 words)

 [No title]
Since this database is a good case for studying some of the problems that can occur when converting an XML structure into a relational database design, we will discuss the structure in more detail.
For our comparison we distinguish between data models as the conceptual layer (domain), documents as singular non-encapsulated formats, collections of such documents and special encapsulating containers which are called database management systems.
When people speak about the advantages of the relational domain they often refer to the special features of relational database management systems such as transaction mechanism, data integrity, data security, multi user access, cross database actions, speed of searching and in particular the easiness with which it is possible to create simple user interfaces.
emeld.org /workshop/2004/Wittenburg/Wittenburg-paper.doc   (4999 words)

 Object Database vs. Object-Relational Databases
It is this new class of database we want to discuss and contrast with the relational databases from which they are evolving and also with the pure object databases they will never replace.
Relational database technology was originally described by E. Codd and later implemented by IBM and others in products.
The relational database vendors and their partners have provided a plethora of tools, mostly forms based, that hide the SQL from the user and generate it in the background.
www.ca.com /products/jasmine/analyst/idc/14821E.htm   (8082 words)

 The Nature of Linguistic Data: Using Databases
A database system which models entities in the real world as objects and follows the object-oriented paradigm of programming.
(This is not true of data modeling in a relational database system; all of the information about a single entity in the real world may be scattered throughout many tables of a normalized database.) An object stores state information (variously called properties, attributes, or instance variables; these are like the fields of a database record).
CELLAR (Computing Environment for Linguistic, Literary, and Anthropological Research) is a multilingual object-oriented database system that has been developed by the Summer Institute of Linguistics to specifically meet the six requirements for a linguistic computing environment.
www.sil.org /computing/routledge/simons/databases.html   (1054 words)

 [No title]   (Site not responding. Last check: 2007-11-03)
Relational Databases are still by far the mostly used databases.
Application developers have a hard time making a choice what technologies are good for their applications when they try to use XML as messaging and relational database at the back-end.
They need a clear study and comparison of the different techniques available to them, what is good for their type of applications (data centric/ document centric applications).
www.cs.duke.edu /~vkb/advdb/xmldatabase/documents/Proposal.doc   (533 words)

 JBoss.com - The State of Workflow by Tom Baeyens
If database systems are like a respected, wise man telling a clear story, then workflow must be a bunch of spoiled brats shouting their own truth at each other.
With this statement I would like to point out that workflow management systems are at the very initial phase of the technology hype curve.
A workflow management system (WFMS) is a software component that takes as input a formal description of business processes and maintains the state of processes executions, thereby delegating activities amongst people and applications.
www.jboss.com /products/jbpm/stateofworkflow   (5835 words)

 Learn About Microsoft Access
Microsoft Access is a relational database management system from Microsoft, packaged with Microsoft Office Professional which combines the Jet relational database engine with a graphical interface.
The report writer in Access is similar to the other popular database report writer – Crystal Reports but the two products are vastly different in their approach.
All database queries, formulas, and reports are stored in the database, and in keeping with the ideals of the relational model, there is no possibility of making a physically structured hierarchy with them.
www.educationonlineforcomputers.com /learn_about_microsoft_access.html   (955 words)

 Object Data Management: Object-Oriented and Extended Relational Database Systems - $34.99   (Site not responding. Last check: 2007-11-03)
This revised introduction to object-oriented and extended relational database systems incorporates significant developments in the field since the first edition was published.
With database technology and its uses developing so rapidly, it is not surprising that additional and updated information is required just two years after the book's initial and well-received publication.
Any database system user interested in the latest technologies, particularly users with large amounts of complex data to manage, as well as students, designers, and implementors of such systems, will find this book packed with useful information.
www.awprofessional.com /titles/0-201-54748-1   (2601 words)

Computer systems typically incorporate capacious storage devices that are slow (e.g., disk drives) and smaller storage devices that are fast (e.g., memory chips, which are 100,000 times faster than disk).
In a relational database, data models are built from tables.
The operating system is also responsible for hiding the details of the computer hardware from the application programmers, e.g., letting a programmer say "I want to write ABC into a file named XYZ" without the programmer having to know how many disk drives the computer has or what company manufactured those drives.
philip.greenspun.com /panda/glossary.html   (4057 words)

 CSMN Course Descriptions - Graduate School - UMUC   (Site not responding. Last check: 2007-11-03)
Ways of investigating the management of the risk and security of data and data systems are presented as a function of design through recovery and protection.
Focus is on basic concepts of database modeling and design, the languages and facilities provided by database management systems, and techniques for implementing relational database systems.
The development of distributed database management is introduced by focusing on concepts and technical issues.
www.umuc.edu /prog/gsmt/csmncat.html   (2008 words)

 lichenghong's Weblog
The primary advantage to keeping such information in the database is that the database provides a central repository for all relevant information, as opposed to the typical approach in which data is scattered over miscellaneous files.
Translucent Databases, as Peter Wayner offers a better, deeper protection paradigm for databases, one that works by scrambling the data with encryption algorithms, using the minimal amount of encryption that ensures the database is still highly functional.
If database systems are like a respected, wise man telling a clear story, then workflow must be a buch of spoiled brats shouting their own truth at each other.
jroller.com /page/charlie.li/20041107   (15547 words)

 Multi-Dimensional Databases: Comparison of Relational and Multi-Dimensional Database Structures   (Site not responding. Last check: 2007-11-03)
The relational database model uses a two-dimensional structure of rows and columns to store data, in tables of records corresponding to real-world entities.
Accessing data from relational databases may require complex joins of many tables and is distinctly non-trivial for untrained end-users, who may be forced to hire IT professionals to structure such queries in a query language, such as SQL.
In a multi-dimension database system, the data is presented to the user in such a way as to represent a hypercube, or multi-dimensional array, where each individual data value is contained within a cell accessible by multiple indexes.
www.design-ireland.net /multi/multi2.php   (1136 words)

 EquipRD! Documentation - Database Comparison
To implement an inventory management system (IMS), a database must be employed to track inventory and user status.
Database only runs on Windows, limited to 255 users, limited to 32,768 objects in database, file size limited to 2 GB.
It was chosen for research for comparison purposes, although the lower end of its price range is comparable to Microsoft SQL Server 2000.
cegt201.bradley.edu /projects/proj2003/equiprd/database.html   (1052 words)

 Database concepts and standards
These articles provide a basic background on concepts and standards for database management systems (DBMS).
Many of these concepts apply to all forms of database management systems: relational (RDBMS), object (ODBMS), XML (XDBMS), and others as well as object-relational mapping and XML-mapping products.
If you would like to be notified when new articles are available, add your name to our mail list.
www.service-architecture.com /database/articles/index.html   (130 words)

 Object Database vs. Object-Relational Databases
This bulletin discusses the intense changes and innovations currently shaping database technology and related products.
It includes a summary of 1996, when a trend toward multimedia-type database product rollouts and a new extended version of relational database technology emerged dubbed the "object relational" database management system (ORDBMS).
The ORDBMS technology is compared with the relational databases from which ORDBMS is evolving and with the pure object databases that they will never replace.
www.ca.com /products/jasmine/analyst/idc/14821Eat.htm   (231 words)

 Storing XML in Relational Database Management Systems @ XML JOURNAL   (Site not responding. Last check: 2007-11-03)
When we need to store XML in a Relational Database Management System (RDBMS) we have to think of nonnative ways to store it, since the structure of XML does not fit the flat relations of the RDBMSs.
It's possible to represent the XML nodes as vertices of the tree and the relations between the XML nodes as the edges.
Numbering is essential for capturing the parent-child and ancestor-descendant relations, which will be used for answering XML queries.
xml.sys-con.com /read/190434.htm   (1753 words)

 Database Platform Comparison | Gadgetopia
It’s a comparison of major database platforms and their support of various features.
Comparison of different SQL implementations: This is a phenomenal page listing how the different database server platforms handle standard SQL...
maybe that just tells you how (un?)important the points that the comparison is being made on could be.
www.gadgetopia.com /post/4310   (306 words)

 Cetus Links: 18,047 Links on Objects and Components / Object-Oriented Database Management Systems
Performance Evaluation and Improvement of Object Database Applications (Eric Richard Hughes)
Versant 5.0 Now is the time to retrain relational recruits to win the object war.
An Annotated Bibliography of Benchmarks for Object Databases
www.objenv.com /cetus/oo_db_systems_1.html   (110 words)

 Common Database SQL Support | Gadgetopia
Comparison of different SQL implementations: This is a phenomenal page listing how the different database server platforms handle standard SQL tasks, for instance row limited, ORDER BY, NATURAL JOINS, etc. Extremely well-researched.
The following tables compare how different DBMS products handle various SQL (and related) features.
If possible, the tables also state how the implementations should do things, according to the SQL standard.
www.gadgetopia.com /post/4306   (244 words)

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