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A logical schema

A. is the entire database

B. Describes how data is actually stored on disk.

C. is a standard way of organizing information into accessible parts.

D. All of the above

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  1. Which of the following is true for network structure?
  2. HSAM stands for ……….
  3. The graphical representation of a query is .
  4. The normal form that is not necessarily dependency preserving is
  5. Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.
  6. A ______ module is typically designed so that it will run on a user workstation or personal computer.
  7. If a transaction T has obtained an exclusive lock on item Q, then T can
  8. A table can have only one
  9. Relations produced from an E-R model will always be
  10. Isolation of the transactions is ensured by
  11. In a relational schema, each tuple is divided into fields called
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  13. Protection of data from unauthorized Disclosure results in loss of _______
  14. Which of the following is not a logical database structure?
  15. The rule that a value of a foreign key must appear as a value of some specific table is called a
  16. Wait-for graph is used for
  17. The part of a database management system which ensures that the data remains in a consistent state is
  18. The data models defined by ANSI/SPARC architecture are
  19. The ______ key of a relation is the attribute (column) or collection of attributes, which uniquely identify…
  20. As per equivalence rules for query transformation, selection operation distributes over
  21. The collection of information stored in a database at a particular moment is called as ......
  22. In a multi-user database, if two users wish to update the same record at the same time, they are prevented…
  23. Shadow paging has
  24. The _______ is a set of programs to use and / or modify this data.
  25. _____ command can be used to modify a column in a table
  26. The relational model is based on the concept that data is organized and stored in two-dimensional tables…
  27. Tree structures are used to store data in
  28. Which of the following aggregate functions does not ignore nulls in its results?.
  29. The size of a data item is called its _______, which can be a field of some record or may be a larger…
  30. The metadata is created by the