Client Server Database Architecture Client server database architecture consists of two logical components. One is “Client” and the other one is “Server”. Clients are those who send the request to perform a specific task to the server. Servers are normally receive the command sent by the clients, perform the task and send the appropriate result … Read more
Loosely And Tightly Coupled Systems Some, but not all, distributed systems are loosely coupled. Coupling refers to the degree to which two or more processes are interdependent. We say two things are tightly coupled when they are interdependent and loosely coupled when they are independent. Tight and loose coupling are not binary positions, but … Read more
Heterogeneous database/federated database/Multi database Heterogeneous Distributed Databases A system might be considered heterogeneous when it has different operating system at each site, and different DBMS at each site. A system in which each server is autonomous and centralized DBMS that has its own local users is referred to as HDMS. The term Federated Database system … Read more
Data Replication – Mobile Computing Data Replication in Mobile Computing Data replication is the process of making copies of data stored on various sites in order to improve – reliability, efficiency, robustness, simpler transaction, fault tolerance and reduce network load Goals of data replication Data replication is performed with the purpose to Increase the availability … Read more
Mobile Database – Data Management Issues Data management technology that can support easy data access from and to mobile devices is among the main concerns in mobile information systems. Mobile computing may be considered a variation of distributed computing. The two scenarios in which mobile databases are distributed are: Among the wired components, the entire … Read more
Mobile IP – Agent Discovery – Registration – Tunneling Mobile IP is a communication protocol that allows users to move from one network to another with the same IP address. It ensures that the communication will continue without the user’s sessions or connections being dropped. Home Network: The home network of a mobile device … Read more