Abstract

This paper presents a comparison of three developmental experiences of fuzzy DBMS (Database Management Systems). These developments have expanded the functionality of some existing relational DBMS (PostgreSQL, Oracle, Firebird, SQL Server, MySQL and DB2) to handle queries with vague terms. The three approaches presented are based on three different methods of integration known as weak, medium and strong coupling strategies. These developments are based on evaluation mechanisms that give good behavior in terms of time spent for query processing. In addition, this paper also presents two user experiences of these fuzzy DBMS, which show a high acceptance by users. To do so, are some applications developed using our fuzzy DBMS. These experiences show that fuzzy DBMS are appropriate and necessary in real-world applications. © 2013 IEEE.