Abstract:
In design and development of an application program for use with the distributed data base on IBM AS/400, normally, an application program developer must control accessing to the data base on IBM AS/ 400 that connecting in the network. This causes the development of the application program to be troublesome and may be inefficiency in accessing the data base from various systems. The utility programs, therefore, are designed and written by the researcher to assist in using the distributed data base more conveniently. The application program developer can use the service after completed the installation of essential utility programs. For this research, the researcher did the research on IBM AS/400 computer units, models E10 and F10 connecting via telephone lines by using SDLC protocol. The utility programs have been designed and developed to perform two major functions. The first function is to perform database structure reorganization, and the later perform function call services for data base accessing in the network. These programs will simulate functions of distributed data base management system and has the significant properties as follows; Location Transparency, Fragmentation Transparency , Concurrency Control, and Recovery In addition, the utility programs can also be used with partition data bases, replication distributed data bases, and centralized data base. Especially, the replication data bases, the technique of 2-phase commit protocol is used to insure data base integrity. In testing the utility programs using sample data, it Is found that the programs performed the functions in according to the thesis objectives and can reduce the application program development time.