There are different kinds of data models. They are a collection of conceptual tools for describing data, data relationships, data semantics, and consistency constraints. Which one of the following is an example of a data model that permits the specification of data where individual data items of the same type may have different sets of attributes.

At the logical level, each record does not need to be described by a type definition.

Software that is freely distributed, along with the code underlying the program, so that people can access the code to improve it is known as ________.

Shards or slices of a database should be accessed from the same computer for improved performance.

A _____ is a statement requesting the retrieval of information.

Durall is a leading manufacturer of decorative crafts in Canada. Which of the following, if true, indicate the threat of new entrants is high for Durall?

There are database languages which helps to design data and applications

For questions 10 − 12 consider the region S defined by:

Which of the following strategies is devised to raise switching costs?

The statement problem A is in the class NP-complete  is equivalent to