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View maintenance for intentional relations is one of the most active research topics in deductive databases. The simplest, but the most frequently found form of the recursive relations in deductive databases is transitive-closure relations. Materialized transitive closure view definitions and...

A multidatabase system allows applications and users to access heterogeneous information through a common interface. Information is shared and exchanged in a transparent way within a federation of autonomous database systems. In a multi+temporal database, the connected systems may be standard...

Formulating queries to access multiple databases can be a formidable task especially when many terms from various databases and complex constraints are involved. To specify a multidatabase query, the user usually has to search through documents for exact database terms and learn the multidatabase...

Approximately 90% of the respondents of an informal survey* on data warehousing opportunities readily identified data quality problems in their database systems. The respondents included administrators, software engineers, sales personnel, documentation and technical support, among others. The data...

An interview with Mitchell Bostelman,Project Manager American Society for Engineering Education (ASEE) and Sanjai Chandra, President Microtek Information Systems, Inc.

The proliferation of Information Resource Dictionary System (IRDS) products spurred the issuance of national and international standards in 1988 and 1992. Even so, there are numerous features of IRDSs that are not covered by the standards. This paper seeks to provide a comprehensive set of criteria for...

Although data modeling has been an area of intensive research, there is a lack of operational procedures for measuring model quality and for integrating large-scale models. Progress has been limited because the meaning associated with the individual elements of a model needs to be taken into account....

This paper compares conceptual data models including extended entity relationship (EER), semantic object model (SOM), object role modeling (ORM), and object modeling technique (OMT) in terms of model correctness, modeling time, and perceived ease-of-use. For an empirical study, 28 graduates and 72...

As database systems continue to grow in size and complexity, organizations may find themselves struggling with the burden of poorly documented systems. In many cases, developers and testers are forced to work directly with cryptic and unstructured applications potentially introducing errors or delaying...

Jeana Scheirer is currently a consultant in Research and Development for Q-Labs, Inc., an international Software Engineering consulting firm, dedicated to providing state-of-the-art Software Engineering techniques to organizations performing software development. Her previous experience has included...

In the near future industry experts predict the object paradigm will be adopted as the dominant approach to systems analysis, design, and implementation. The promise of the object-oriented approach to systems analysis hinges on correctly partitioning the problem domain into essential classes and...

We propose a new replication control scheme for multiple-copy consistency in mobile distributed database systems. Replicating data at multiple sites could contribute to enhance the availability regarding the distributed data. Replicating data, however, inevitably induces the burden of maintaining...

Data utilization is an important aspect of information systems. Over the last two decades, numerous experimental studies have been conducted on user performance involving database-related tasks with certain database models and/or languages. In this paper, we propose a two-dimensional conceptual...

Though the concept of sharing good practices regarding database development is not new, many organizations lack an effective sharing mechanism. A typical problem occurs when a work assignment is concluded without properly gathering and storing good practices. Good practices that have been identified...

At one point in an episode of the campy Batman TV series of the 1960’s, Batman came up with an obscure fact about ancient Egyptian history. Robin looked at him, totally in awe, and said, “Gee, Batman, isn’t there anything you don’t know?” Batman replied (seriously), “Yes, Robin. A few things.” From the...

Thomas Ernest Allen was born in Chateauroux, France. He graduated from Wagner High School, Clark Air Base, Philippines. He attended Howard University, Washington D.C. majoring in mathematics. He earned a master’s degree in Safety and Systems Management with a Computer Information Systems Certificate...

The Query Clearing House (QCH) model aims at achieving an ideal heterogeneous multiple database environment in which users can submit queries without concern for the location of the data or the specifics of the relevant database schemas. One important prerequisite for building such an environment is to...

To preserve safety during software maintenance, an engineer needs to be able to answer a variety of questions about the software in a very short time. In the current state of practice, this is sometimes not possible. Any solution to this problem should allow group usability of information, automatic...

Serializability is too strict a correctness criterion for several application domains, in particular where support for long-lasting transactions is required. This paper describes a generalized version of serializability called conditional conflict serializability (CCSR), which is built on a customized...

Electronic commerce is a generic term that encompasses numerous information technologies and services used to improve business practices ranging from customer service to inter-corporation coordination. One of the most common instances of electronic commerce is the exchange of goods and services over...