Abstract: Efficiently and effectively managing the distributed, heterogeneous and autonomous databases under web environment is a key issue for many applications such as grid systems. However, until now no prototype has been applied for databases under web environment without any restriction on local database characteristics, such as data consistency, subsequent control, security control and transaction, etc. In this paper, a data management model named CoDMS is developed to solve this problem. CoDMS is based on computer-supported cooperative work concepts and a data consistency model. Virtual tables are defined to control data consistency, that is, to make it possible to query and/or transfer data without considering local database characteristics. We have also developed a prototype based on CoDMS for web-based database management systems. We shall discuss subsequent security and transaction in the future.

Key words: web-based data management, computer-supported cooperative work, consistency model, virtual table