Quiz on Data Cube Operations

What is a slice in the context of data cubes?

• A subset of the cubes for a single value of one or more dimensions

• A method to store data in relational databases

• A visualization operation that rotates data axes

• A selection on multiple dimensions

What does the dice operation do?

• It selects data based on one dimension

• It rotates the data axes for visualization

• It stores data in a multidimensional cube

• It describes a sub cube by selecting on two or more dimensions

Which of the following is true about the pivot operation?

• It stores data in relational databases

• It is also called a rotation and provides an alternative presentation of data

• It is a method for fast query results

• It creates a new sub cube from one dimension

What does MOLAP stand for?

• Multilevel OLAP

• Multidimensional Online Analytical Processing

• Multidimensional OLAP

• Multilevel Online Analytical Processing

How is data stored in ROLAP?

• In hybrid formats

• In multidimensional cubes

• As tables in a relational database

• In flat files

What is a characteristic of HOLAP?

• It only uses SQL for queries

• It combines features of MOLAP and ROLAP

• It is the fastest query method

• It stores all data in cubes

What is the result of a slice operation on a three-dimensional cube?

• A three-dimensional cube

• A two-dimensional site

• A one-dimensional array

• A relational database table

Which of the following is NOT a dimension used in the dice operation example?

• Time

• Location

• Item

• Customer

What is the primary benefit of using MOLAP?

• Slower query responses

• It requires complex SQL queries

• Data is stored in relational tables

• Fast query results due to pre-computed data

In the context of data cubes, what does the term 'sub cube' refer to?

• A smaller cube formed by selecting specific dimensions

• A visualization of data

• A complete cube with all dimensions

• A type of database table