Database Types: Distributed, Centralized or Decentralized
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Consider the following normalized relations for a database in a large retail store chain:
EMPLOYEE(Emp_Id, Work_Location, Name, Address)
STORE(Store_ID, Region, Manager_ID, Square_Feet)
DEPARTMENT(Dep_ID, Manager_ID, Sales, Goal)
SCHEDULE(Dep_ID, Emp_ID, Date)
Assume that a data communications network links a computer at corporate headquarters with a computer in each retail outlet. The chain includes 50 stores with an average of 75 employees per store. There are 10 departments in each store. A daily schedule is maintained for 5 months (the previous 2 months, the current month, and next 2 months). Further assume that:
- Each store manager updates the employee work schedule for her or his store
roughly five times per hour.
- The corporation generates all payroll checks, employee notices, and other
mailings for all employees for all stores.
- The corporation establishes a new sales goal each month for each department.
- The corporation hires and fires store managers and control all information about
store managers; store managers hire and fire all store employees and control all
information about employees in that store.
a. Would you recommend a distributed database, a centralized database, or a set of decentralized databases for this retail store chain? Justify your answer.
b. Assuming that some form of distributed database is justified, what would you recommend as a data distribution strategy for this retail store chain? Justify your answer.
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Solution Summary
Solution clearly explains the three different types of databases Distributed, Centralized and Decentralized and also when to use which type database type.
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(a)
From the question.
It is clear that the corporation headquarters ONLY needs information for generation of paychecks, notices and other mailing lists. It is enough if we have EMPLOYEE table at one place.
Also corporate office set sales goal for each departments (for ...
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