RESUMEN

This paper describes a set of facilities for programming distributed transactions over direct access files which are accessed by primary key. The files are located on several computers communicated by a network. Each site has the set of GNU dbm (Gdbm) routines for local file management [Nelson 93]. Above this platform we have built an interface and a set of services for distributed transaction programming. The resultant programming environment,"DGDBM", offers transparency in relation to data distribution, giving a centralized vision to the programmer. It assures the function of management of distributed transaction like as failure recovery and concurrence control. DGDBM is an useful support for distributed application programming over direct access files en UNIX networks and it is available as an API (application programming interface) for the C programmer. This paper describes the services offered by DGDBM to the programmer, the architecture of the system, the adopted solutions for distributed transaction management, the general aspect of design and implementation and the perspectives and planned extensions for this project.