Advantages of Distributed System over Independent PCs--

1. Data Sharing: It is always possible to have people working independently on their
own PCs, for the same business. But we know that users may need to share data. For example,
airline reservation clerks need access to the master database of flights and existing
reservations. Giving each clerk his own private copy Of the entire database would not work,
since nobody would be able to know which seas the other clerks have all ready sold. Shared
data is absolutely essential to this of application and so, the machines must be.
interconnected
2.Device Sharing: Data are not the only things to be shared. Expensive . peripherals
such as color laser printers, photo-type setters and massive archival storage devices are also
among the few things that should be sharable.
3. Communication: Another reason to connect a group of isolated computers into a
distributed system is to achieve enhanced person-to-person communication. For many people,
electronic mail has numerous attractions over paper mail, telephone and FAX as it makes
various kinds of documents accessible by the people without changing their formats. this
requires a good communication setup.
4. Flexibility: Finally, a distributed System is potentially more flexible than giving each
user a isolated personal computer. If, we have a mixture of personal and shared computers, perhaps of different sizes, and jobs run on the most appropriate ones rather than always on
the owners machine. Then the workload can be spread Over the computers more effectively
and letting people run their jobs elsewhere may compensate for the loss of a few machines.
This way the system will be more flexible.