This Data Warehouse Online Test
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About the test

The Data Warehouse online test assesses candidates' knowledge of data warehouses and their ability to design them.

It's an ideal test for pre-employment screening of candidates applying for roles such as Big Data Engineers, Data Warehouse Developers, and Data Warehouse Administrators.

This online test requires candidates to answer multiple-choice questions about how data warehouses are designed, how to convert a relational model to a snowflake or star schema, and how to work with OLAP cubes.

Sample public questions

Management of a multinational news company would like to see how the number of viewers of different news sections varies per country, for each day.

The data is in an OLAP cube and needs to be transformed to get the data the management is looking for. Below are the diagrams of starting and expected OLAP cubes:

An OLAP cubeAn OLAP cube

What operations should be performed to transform the first OLAP cube into the second OLAP cube?

Data Warehouse
Drilldown
OLAP Operations
Pivot
Easy
3 min
mca
Public

A construction supply company wants to implement a data warehouse to analyze the performance of their online portal for ordering custom cuts of lumber.

Their sales data is currently stored in two separate transaction processing relational databases, one contains inventory and the other one contains sales data. Both databases save their data in a normalized schema. One of the reasons for implementing a data warehouse is that it takes too much time to query the databases for average sales data and inventory status, which causes some online transactions to timeout.

How should the data warehouse be implemented?

Data Warehouse
Software Architecture
Easy
3 min
mca
Public

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Peter Gibbons

Java and SQL

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Skills and topics tested

  • Data Warehouse
  • Snowflake Schema
  • Software Architecture
  • OLAP Cube
  • Drilldown
  • OLAP Operations
  • Slices
  • Dice
  • Pivot

For job roles

  • Big Data Engineer
  • Data Warehouse Administrator
  • Data Warehouse Developer

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