Data warehousing interview questions

  • How is data stored in a warehouse?

    Data is typically stored in a data warehouse through an extract, transform and load (ETL) process.
    The information is extracted from the source, transformed into high-quality data and then loaded into the warehouse.
    Businesses perform this process on a regular basis to keep data updated and prepared for the next step..

  • What are 5 factors to consider in data warehousing?

    5 Critical Factors to Consider When Choosing a Data Warehouse

    Business Requirements.
    It is imperative to determine your business needs and specific use cases. Cost Estimations. Capabilities and Technology. Accessibility and Speed. Scalability..

  • What are the 5 basic stages of the data warehousing process?

    Steps in Data Warehousing

    Extraction of data – A large amount of data is gathered from various sources.Cleaning of data – Once the data is compiled, it goes through a cleaning process. Conversion of data – After being cleaned, the format is changed from the database to a warehouse format..

  • What is a data warehouse answers?

    Before diving into the interview questions, let's begin by understanding the data warehouse's overview.
    A data warehouse is a system to collect and manage extensive data from multiple sources, such as transactional systems, log files, and external data sources.Jul 31, 2023.

  • What is data warehousing explain briefly?

    A data warehouse is a central repository of information that can be analyzed to make more informed decisions.
    Data flows into a data warehouse from transactional systems, relational databases, and other sources, typically on a regular cadence..

  • Data warehousing is a skill that can help you store, manage, and analyze large volumes of data from different sources.
    It can also enable you to create reports and dashboards that provide insights and support decision-making.
  • ETL stands for “extract, transform, and load.” Together these activities make up the process used to take data from the source and convert it into a usable format – and then move it into a data warehouse or other data store.
  • Once in the data warehouse, the data is ingested, transformed, processed, and made accessible for use in decision-making.
    The three main types of data warehouses are enterprise data warehouse (EDW), operational data store (ODS), and data mart.
Sep 20, 2023Top 50 Data Warehouse Interview Questions and Answers1) What is Data Warehouse?2) What is Business Intelligence?3) What is Dimension 
Top 50 Data Warehouse Interview Questions and Answers
  • 1) What is Data Warehouse?
  • 2) What is Business Intelligence?
  • 3) What is Dimension Table?
  • 4) What is Fact Table?
  • 5) What are the stages of Datawarehousing?
  • 6) What is Data Mining?
  • 7) What is OLTP?
  • 8) What is OLAP?

What Is Business Intelligence?

Business Intelligence is also known as DSS – Decision support system which refers to the technologies, application and practices for the collection

What Is Dimension table?

Dimension table is a table which contain attributes of measurements stored in fact tables. This table consists of hierarchies

What Is Fact table?

Fact table contains the measurement of business processes, and it contains foreign keys for the dimension tables

What Are The Stages of Datawarehousing?

There are four stages of Datawarehousing: 1. Offline Operational Database 2. Offline Data Warehouse 3. Real Time Datawarehouse 4

What Is Data Mining?

Data Mining is set to be a process of analyzing the data in different dimensions or perspectives and summarizing into a useful information

What Is OLTP?

OLTP is abbreviated as On-Line Transaction Processing

What Is OLAP?

OLAP is abbreviated as Online Analytical Processing, and it is set to be a system which collects, manages

What Is Ods?

ODS is abbreviated as Operational Data Store and it is a repository of real time operational data rather than long term trend data

What Is The Difference Between View and Materialized View?

A view is nothing but a virtual table which takes the output of the query and it can be used in place of tables

What are data warehouse interview questions & answers?

Here are Data Warehouse interview questions and answers for fresher as well experienced candidates to get their dream job

1) What is Data Warehouse? Data warehousing (DW) is the repository of a data and it is used for Management decision support system

What is a data warehouse (DW)?

The answer is simple: a Data Warehouse (DW or DWH), also known as an enterprise Data Warehouse (EDW), is a framework used for documentation and data collection that is a crucial element of business intelligence

DWs are primary archives of combined data from one or more outlets

Why is data warehouse analysis a good career option?

A data warehouse allows us to manage the collected data, which can, in turn, helps in providing significant business insights

It is an essential Business Intelligence (BI) field, and this makes Data Warehouse Analysis one of the most sought-after career options today

Here are some questions an interviewer might ask:

  1. Have you worked in this type of position before?
  2. What's the most challenging experience you've encountered at work?
  3. What data warehousing tasks are you good at performing?
  4. Can you tell me how your work experienc e is relevant to this position?
  5. What kind of systems have you worked with in the past?
  6. What did you study in college?
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