This is the DBMS questions and answers section on "OLAP" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. OLAP stands for
- A. Online analytical processing
- B. Online analysis processing
- C. Online transaction processing
- D. Online aggregate processing
Answer: Option A
Explanation:
Online analytical processing
OLAP is the manipulation of information to support decision making
2. Data that can be modeled as dimension attributes and measure attributes are called _______ data.
- A. Multidimensional
- B. Singledimensional
- C. Measured
- D. Dimensional
Answer: Option A
Explanation:
Multidimensional
Given a relation used for data analysis, we can identify some of its attributes as measure attributes, since they measure some value, and can be aggregated upon.Dimension attribute define the dimensions on which measure attributes, and summaries of measure attributes, are viewed.
3. The generalization of cross-tab which is represented visually is ____________ which is also called as data cube.
- A. Two dimensional cube
- B. Multidimensional cube
- C. N-dimensional cube
- D. Cuboid
Answer: Option A
Explanation:
Two dimensional cube
Each cell in the cube is identified for the values for the three dimensional attributes.
4. The process of viewing the cross-tab (Single dimensional) with a fixed value of one attribute is
- A. Slicing
- B. Dicing
- C. Pivoting
- D. Both a and b
Answer: Option D
Explanation:
Both a and b
For eg., The item name and colour is viewed for a fixed size.
5. The operation of moving from finer-granularity data to a coarser granularity (by means of aggregation) is called a ________.
- A. Rollup
- B. Drill down
- C. Dicing
- D. Pivoting
Answer: Option A
Explanation:
Rollup
The opposite operation—that of moving fromcoarser-granularity data to finer-granularity data—is called a drill down.
