Rapport de stage de DEA Informatique Sujet : Etablissement d'un système transactionnel relationnel/objet pour longues transactions.

The concurrency control problem has been for a long time a source of research in the database community. If traditional databases use models that have been validated, they don't fully answer to specific situations as the problem of long transactions met in software development environments (SDEs) and CAD/CAM systems. This paper presents a solution that can solve this problem of long transactions and offers the possibility of using independently a relational or an object representation of data. Such a system provides a cooperative support for advanced database applications and can allow a network query to be more efficient. 1. Introduction Traditional solutions that prevent databases from corruption or incompatible access due to the share of information between users are not suited with advanced database applications as software development environments or CAD/CAM systems that make transactions can last several hours or days, as the result of human interaction. Thus, a new solution for ..