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DFD stands for

A. Data Flow Document

B. Data File Diagram

C. Data Flow Diagram

D. Non of the above

Correct Answer : C.


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  1. The cost of reading and writing temporary files while evaluating a query can be reduced by
  2. The graphical representation of a query is .
  3. DBMS helps achieve
  4. Precedence graphs help to find a
  5. If two relations R and S are joined, then the non matching tuples of both R and S are ignored in
  6. The part of a database management system which ensures that the data remains in a consistent state is
  7. What is data integrity?
  8. Data items grouped together for storage purposes are called a
  9. Processed data is called _____
  10. Which is the best file organization when data is frequently added or deleted from a file?
  11. _____ database is used to provide statistical information or summaries of values based on various criteria.
  12. Which of the following is true for network structure?
  13. The rule that a value of a foreign key must appear as a value of some specific table is called a
  14. Which of the following is not a consequence of non-normalized database?
  15. Which two files are used during operation of the DBMS?
  16. Union operator is a :
  17. The keyword to eliminate duplicate rows from the query result in SQL is
  18. An advantage of the database management approach is
  19. What is a disjoint less constraint?
  20. A DBMS is a ____ user if at most one user can use the system and is mostly restricted to personal computer…
  21. What are the desirable properties of a decomposition
  22. Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.
  23. For correct behaviour during recovery, undo and redo operation must be
  24. The normal form that is not necessarily dependency preserving is
  25. The values of the attribute describes a particular
  26. operator is used to compare a value to a list of literals values that have been specified.
  27. A table can have only one
  28. What will be the number of columns and rows respectively obtained for the operation, A- B, if A B are…
  29. It is an abstraction through which relationships are treated as higher level entities
  30. Which of the following is not a consequence of concurrent operations?