Data Models

A classic game in modern time inside educational context

“…Para llevar acabo esta aplicación se requería un sistema de base de datos capaz de almacenar la información emitida por este juego. Todo esto con base en los principios descritos en [7]. Básicamente hay 3 entidades: persona, juego y pregunta.…”

Capturing Telic/Atelic Temporal Data Semantics: Generalizing Conventional Conceptual Models

“…We summarize below how to represent "what" data semantics that can be captured using a conventional conceptual model (see, for example, [12,20,52,57]), specifically USM [52], utilizing the contract application (outlined in the prior sections) as an example. USM includes concepts such as entity class, attribute, relationship, and superclass-subclass.…”

“…Conceptual database design is widely recognized as an important step in the development of database applications [12,26,57] including the temporal applications described above. During conceptual database design, a conceptual model provides a notation and formalism that can be used to construct a high-level representation of the real world-referred to as a conceptual schema-independent of the implementation details.…”

Distributed Concurrency Control

“…Among these issues, concurrency control in distributed RTDBSs is the main theme of this chapter. Concurrency control in database systems is used to control the interaction among concurrently executing transactions in order to maintain the consistency of the database [20]. In a distributed database system, a scheduler at each site is responsible for controlling concurrent accesses to data items stored at that site.…”