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A distributed database management system (DDBMS) stores a logically related database over two or more physically distinct locations connected by a computer network. A DDBMS must perform all the operations that a usual DBMS must perform and additionally manage the distributed data that is stored in the multiple sites of the DDBMS. A DDBMS presents both advantages and disadvantages over a standard DBMS.Now, discuss the following points:In which type of application or situation would you consider using a distributed database instead of a centralized DBMS?When would you want to use a centralized database instead of a distributed database?
Indicate changes you require to make to design of Premiere Products database to support following situation: There is no relationship between customers and sales reps.
Explain how much the modulating signal power is required to generate 100 percent modulation? What is the approximate center frequency of filter required to pass the lower sideband?
How many entities are shown by this relation?
Over 70% of web applications use database to store persistent data. Write some of the problems and issues associated with internet databases?
Create a structurally sound relational database schema showing the minimum number of fields, tables, and relationships between the tables.
List the students ID, name, GPA, and course Number such that all students have GPA greater than 3 . 5 and enrolled in a course in Jan 1, 2011. Find the names of all students who have GPA greater than 3.
What actions does a referential integrity constraint prevent from occurring when data is inserted in a table that contains this constraint?
Consider a relation schema r(A,B,C,D,E, F) and a set of functional dependencies {A BCD,BCDE,BD,DA}. Determine whether or not (A,E, F) is in BCNF and justify your answer. If (A,E, F) is not in BCNF,find a BCNF decomposition of it.
Sketch a DFSA for identifiers which contain only letters and digits, where identifier should have at least one letter, but it need not be first character.
Difference between obsolescent and redundant stocks
However, the only way you can access values is through queries to the databases. In single query, you can specify value k to one of two databases.
Explain the concept of physical data independence and its importance in database systems, List four significant differences between a file-processing system and a DBMS.
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