3i Infotech Placement: Sample Questions 112 - 113 of 1245

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Question 112

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Describe in Detail

Essay▾

What is system catalog or catalog relation? How is better known as?

Explanation

Definethe System Catalog
  • A DBMS maintains information about each of relation and index that it contains.
  • The metadata is the information stored in a collection of relations maintained by the system
  • It is also called data dictionary.
  • The catalog relations are also called the system catalog or the data dictionary.
  • The system catalog is sometimes also referred to as metadata (data about data) .
  • The system catalog is generally used only for query optimization.
  • It is also known as metadata.

Question 113

Question

MCQ▾

The UNIX shell ________

Choices

Choice (4)

a.

Does not give any scope for programming

b.

Does not come with the rest of the system

c.

Forms the interface between the user and the kernel

d.

Does not allow calling one program from within another

Answer

c.

Explanation

  • A Shell provides an interface to the Unix system.
  • It gathers inputs and executes programs based on that input forming an interface between the user and the kernel.
  • When a program finishes executing, it displays program՚s output.
  • Shell provides and environment to run user commands, programs, and shell scripts.
  • There are different flavours of a shell each with its own set of recognized commands and functions.
Different Flavours of a Shell

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