With the growing popularity and acceptance of Web-based or Internet-delivered education, maintaining pedagogical efficacy and integrity must remain primary goals and objectives. Developing online coursework is becoming a skill required by many in higher education and its predecessors in K-12 education. The technologies are continually streamlined and simplified, thereby opening the doors for an...

It is very challenging part to keep safely all required data that are needed in many applications for user in cloud. Storing our data in cloud may not be fully trustworthy. Since client doesn't

Despite the established theory and the history of the practical use of integrity rules, data quality problems, which should be solvable using data integrity rules, persist in organizations. One effective mechanism to solve this problem is to embed data integrity in a continuous data quality improvement process. The result is an iterative data quality improvement process as data integrity rules ...

Referential integrity underlies the relational representation of objeceoriented structures. The concept of referential integrity in relational databases is hindered by the confusion surrounding both the concept itself and its implementation by relational database management systems (RDBMS). Most of this confusion is caused by the diversity of relational representations for object-oriented struc...

Horizontal decomposition is the process of splitting a relation into sub-relations, called fragments, each containing a subset of the rows of the original relation. In this paper, we consider horizontal decomposition in a setting where some of the attributes in the database schema are interpreted over a specific domain, on which a set of special predicates and functions is defined. We study the...

In this paper we show how we can generate models for the execution of database transactions. We describe a transaction goal by a data model and we give algorithms to generate Petri nets models that specify the execution of these transactions. This is done in such a way that database constraints, in particular referential integrity constraints, are preserved. So if the database is in a consisten...

Topologically structured data models often form the core of many users’ spatial databases. Topological structuring is primarily used to ensure data integrity; it describes how spatial objects share geometry. Supporting topology within the context of a relational database imposes additional requirements – the complex topological model must retain integrity across transactional boundaries. This c...

Schema mappings specify how data organized under a source schema should be reorganized under a target schema. For tree-structured data, the interplay between these specifications and the complex structural conditions imposed by the schemas, makes schema mappings a very rich formalism. Classical data management tasks, well-understood in the relational model, once again become challenging theoret...

Integrity constraints, a.k.a. data dependencies, are being widely used for improving the quality of schema. Recently constraints have enjoyed a revival for improving the quality of data. The tutorial aims to provide an overview of recent advances in constraint-based data cleaning.