·     Client-Server

This type of multi-user environment is the best implementation of the network and DBMS environments. It has a DBMS server machine which runs the DBMS and to this machine are connected the clients having application programs running for each user. Once a users wants to perform a certain operation on data in the database it sends its requests to the DBMS through its machine’s application software; the request is forwarded to the DBMS server which performs the required operation on data in the database stored in the dame computer and then passes back the result to the user intending the result. This environment is best suited for large enterprises where bulk of data is processed and requests are very much frequent.

Conclusion

This concludes the topics discusses in the lecture No4.In the next lecture Database application development process will be discussed

Exercises:

-      Extend the format of data from the exercise of previous lecture to include the physical and internal levels. Complete your exercise by including data at all three levels

-      Think of different nature of changes at all three levels of database architecture and see, which ones will have no effect on the existing applications, which will be adjusted in the inter-schema mapping and which will effect the existing applications.

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