A real-time active database for high transaction loads and moderate deadlines

A large class of real-time database problems has very high transaction loads and moderate deadlines. Traditional approaches have not been designed to handle such problems. A model based on the use of encapsulated events and rule objects has been developed. The model describes an active, real-time, object-oriented, memory-resident database environment (REACT). A system based on the model has been designed and implemented. A concurrency control algorithm was developed that uses the extra information available from the object-oriented and active features of REACT to pre-process the database and speed up concurrency control. Analysis was done for both single and multiple processor systems. For multiprocessor analysis a simulator was developed to verify the performance of REACT on a multiprocessor system. Examples of all the features needed for an actual system are given along with examples of how REACT can be used to solve real-world control and monitoring problems. Algorithms have been developed to allow users to test that the properties termination, confluence, and observable determinism hold for a target REACT database

Improvement of data quality with timeliness in information manufacturing system (IMS)

Nowadays in the digital world, organizations or enterprises like banks, hospitals, telecommunications or retail shops etc. has an information manufacturing system (IMS) for storing the organization’s data in digital format. Every day, a large quantity of data is manipulated (inserted, deleted and updated) to the information manufacturing system of those enterprises or organizations. To be successful, the IMS must maintain the data and transform it into useful information for decision makers or users. Much of the value will rest in the quality of the data, which may be divided into two classes; objective and time related. In seeking to maintain quality both these classes the completeness, accuracy and consistency of the data and the timeliness of the information generation may be required. As a further complication, Objective data quality class may not be independent. It could be dependent on timeliness of time related class. The main purpose of this research is the improvement of data quality with timeliness in IMS. This starts with observing the reasons for the change of objective data quality over time by using both theoretical and experimental data quality measurements. Novel approaches to ensuring the best possible information quality is developed and evaluated by observing the change of objective data quality scenario with timeliness in a purpose built IMS