Object-relational technology provides a significant increase in scalability and flexibility over the traditional relational databases. The additional object-relational features are particularly satisfying for advanced database applications that relational database systems have experienced difficulties. The key factor to the success of object-relational database systems is their performance. To ...

Database reverse engineering (DBRE) recovers a database design using a semantic data model. Most of the existing works and tools for DBRE and database design specify relational database schemas with extended ER models. The Unified Modeling Language (UML) is a standard language for modeling software and database systems. We discuss how to extend the UML metamodel with elements for modeling relat...

An incrementally maintained mapping from a network to a relational database is presented. This mapping may be established either to support the efficient retrieval of data from a network database through a relational interface, or as the first step in a gradual conversion of data and applications from a network to a relational database system. After the mapping has been established, the only da...

The relational database is very widely used in these days and so as the relational database security is very vital to protect from different kinds of threats and attacks. The security of relational database is very important because now these days all data and information are stored in database by some form of database objects including user’s personal information like credit/debit card details...

Object-relational database systems are now being deployed for real use by customers. Researchers and industry users have begun to explore the performance issues that these systems raise. In this paper, we examine some of those performance issues, and evaluate them for object-relational systems in general and for INFORMIX-Universal Server in particular. We describe objectrelational query process...

XML is an important standard of data exchange and representation. As a mature database system, using relational database to support XML data may bring some advantages. But storing XML in relational database has obvious redundancy that wastes disk space, bandwidth and disk I/O when querying XML data. For the efficiency of storage and query XML, it is necessary to use compressed XML data in relat...

The accelerating pace of application development requires more frequent database switching, as technological advancements demand agile adaptation. increase in the volume data and at same time, number transactions has determined that some applications migrate from one to another, especially a relational non-relational (NoSQL) alternative. In this transition phase, coexistence both databases beco...

In the theory of database systems [1], a database query is defined as a function that maps relational databases to relations. This definition models the situation in practice where one applies an SQL query to a database instance and receives a set of output tuples as the answer to the query on that database. The problem of relational database query induction is then naturally stated as follows:...