REAM: An SQL Based and Extensible Relational Database Management System

REAM (RElational dAtabase Management system) is a relational database management system developed by OKI. The relational database has been expected to be widespread thanks to its well-defined mathematical foundation; however, application programmers have suffered from incompatible access interfaces among various so-called relational database svstems so far due to the absence of the international &&and. The access interface of REAM is an implementation of the internationally standardized SQL. REAM also is extensible iu the sense that it may be accessible through other access languages besides SQL. In addition, REAM can be extended to distributed environment. For the sake of extensibilitv. REAM comes un with a two lavered interface structure, t&d SQL language imerface and theREAM kernel interface. By adding another language interface on the top of the REAM kernel interface, REAM easily provides another language interface for application programs. REAM has already had a set of extended functional capability so that it can work as an underlying system for a distributed database system. This paper presents the system’s design decisions and extended functional capability with addressing the problems left in the standardized SQL. Then, the current implementation of REAM is explained.