La Salle University Evening Division Bulletin 1985-1986

Issued for La Salle University Evening Division 1985-1986https://digitalcommons.lasalle.edu/course_catalogs/1135/thumbnail.jp

Integrating legacy mainframe systems: architectural issues and solutions

For more than 30 years, mainframe computers have been the backbone of computing systems throughout the world. Even today it is estimated that some 80% of the worlds' data is held on such machines. However, new business requirements and pressure from evolving technologies, such as the Internet is pushing these existing systems to their limits and they are reaching breaking point. The Banking and Financial Sectors in particular have been relying on mainframes for the longest time to do their business and as a result it is they that feel these pressures the most. In recent years there have been various solutions for enabling a re-engineering of these legacy systems. It quickly became clear that to completely rewrite them was not possible so various integration strategies emerged. Out of these new integration strategies, the CORBA standard by the Object Management Group emerged as the strongest, providing a standards based solution that enabled the mainframe applications become a peer in a distributed computing environment. However, the requirements did not stop there. The mainframe systems were reliable, secure, scalable and fast, so any integration strategy had to ensure that the new distributed systems did not lose any of these benefits. Various patterns or general solutions to the problem of meeting these requirements have arisen and this research looks at applying some of these patterns to mainframe based CORBA applications. The purpose of this research is to examine some of the issues involved with making mainframebased legacy applications inter-operate with newer Object Oriented Technologies

Active database behaviour: the REFLEX approach

Modern day and new generation applications have more demanding requirements than traditional database management systems (DBMS) are able to support. Two of these requirements, timely responses to the change of database state and application domain knowledge stored within the database, are embodied within active database technology. Currently, there are a number of research prototype active database systems throughout the world. In order for an organisation to use any such prototype system, it may have to forsake existing products and resources and embark on substantial reinvestment in the new database products and associated resources and retraining costs. This approach would clearly be unfavourable as it is expensive both in terms of time and money. A more suitable approach would be to allow active behaviour to be added onto their existing systems. This scenario is addressed within this research. It investigates how best active behaviour can be augmented to existing DBMSs, so as to preserve the investments in an organisation's resources, by examining the following issues, (i.) what form the knowledge model should take, (ii.) should rules and events be modelled as first class objects, (iii.) how will the triggering events be specified, (iv.) how the user will interact with the system. Various design decisions were taken, which were investigated by implementation of a series of working prototypes, on the ONTOS DBMS platform. The resultant REFLEX model was successfully ported and adapted onto a second POET platform. The porting process uncovered some interesting issues regarding preconceived ideas about the portability of open systems

La Salle University Evening Division Bulletin 1986-1987

Issued for La Salle University Evening Division 1986-1987https://digitalcommons.lasalle.edu/course_catalogs/1138/thumbnail.jp

La Salle University Evening Division Bulletin 1987-1988

Issued for La Salle University Evening Division 1987-1988https://digitalcommons.lasalle.edu/course_catalogs/1140/thumbnail.jp

La Salle University Evening Division Bulletin 1988-1989

Issued for La Salle University Evening Division 1988-1989https://digitalcommons.lasalle.edu/course_catalogs/1142/thumbnail.jp

1983-1985 Catalog

https://digitalcommons.sacredheart.edu/g_cat/1047/thumbnail.jp

1989-1991 Undergraduate Catalog

https://digitalcommons.sacredheart.edu/g_cat/1058/thumbnail.jp

1984-1986 Xavier University College of Arts and Sciences, College of Business Administration, Edgecliff College, College of Continuing Education, Graduate School Course Catalog

https://www.exhibit.xavier.edu/coursecatalog/1121/thumbnail.jp