Enterprise Datawarehousing (EDW)


Work in a data warehouse has become a popular job nowadays. With the constant growth of need of quick and always working availability of data, there are more and more job openings for data warehouse. It’s not a typical IT job and most likely you will not have too many competitors in the job interview.

Anyway, people who will be there will for sure know their job. To have a chance to beat them and get the job, you will need to answer all data warehouse interview questions with ease, plus demonstrate the right abilities required for the role. We composed a list data warehouse interview questions to help you with your preparation. If you are able to answer at least 75% of them, you will do all right in the interviews.

 

Most common data warehouse interview questions

  • Can you name the difference between physical and logical design module?
  • Define data warehousing in one sentence?
  • What means “star schema” in relation to databases?
  • Is it possible to connect two fact tables?
  • Why is data mining used more than traditional approaches?
  • Why is slicing and dicing used? Define the logical reason for it from the point of view of business owners.
  • Where does the data go from warehouse?
  • Can you define slowly changing dimensions? Are they still used?
  • What is a look-up table?
  • Name at least three practical situations where snowflake is better than star schema.
  • Is BUS schema still used? Can you name any advantages of it and why it is good to use it?
  • How can you load time dimension?
  • What is OLAP?
  • Can you define OLBD the way that a laicus will understand it?
  • Define agregate tables and its use in data warehousing?
  • What is factless facts table?
  • Can you define active data warehousing and advantages it has?

 

Above you can see the list of most common data warehouse interview questions. Anyway, if you are applying for the job, you probably know your stuff pretty good.

The thing is… other candidates will aslo be well prepared. To improve your chances, check also some interview preparation tips and typical interview questions. These will also be a part of your interview.

As enterprise applications proliferate, organizations are generating and storing ever-more quantities of data that begs to be put to useful purposes. The lessons this data holds for the organization are immense. They can tell the organization what worked and what did not, what generated profit and what was loss-making, what product mix gave them the maximum market share and what flavor and tastes their consumers liked or disliked. These insights are crucial for the continued success of the business and they are all to be gleaned from the humble transactions you have stored and processed over the years.

The challenge is converting your humble transactions into a powerhouse of insights that can guide your business’s future. Well, over the millions of invoices that you raised over the past 15 years, you have all the data to show how your regional markets grew or shrank, how you performed vis-à-vis competitors, which products sold more, in what seasons, in what packaging, with what promotion and pricing and any other insight you can dream of. But this information lies scattered across multiple applications and systems as your IT evolved and changed, part of it is systems of companies you acquired, part of it purchased from market research companies. It also needs to be compared with other information such as collections, market growth, changing market dynamics that may or may not be available in transactions.

Extract, Transform & Load
This is why the Extract, Transform & Load (ETL) phase of datawarehousing is considered to be the crucial phase where you need to bring superior business analysis and technology skills together. TriumphSys, having executed multiple DWH projects over the years, brings a lot of experience and expertise to the process of architecting your ETL layer, extracting from multiple sources and massaging it into an acceptable format and accuracy, staging schemas, selection of right technology platforms to meet your specific needs, denormalization of your data to balance flexibility and efficiency. TriumphSys skills include developing complex data extraction and integration orchestration using WebSphere Information Server , Informatica, Ab-initio, Datastage, SSIS as well as building custom extraction engines to meet specific, unique data situations.

TriumphSys creates a datawarehouse that empowers the customer with scalable reporting via cubes, adhoc and on-the-fly querying and reporting and ability to enhance the data sources and content as the business dynamics change. We build warehouses using Microsoft, Oracle, IBM and Teradata platforms.

Warehouse based reporting
Having built a flexible and efficient datawarehouse is half of the challenge. The next is exploiting the datawarehouse to provide flexible, scalable and easy reporting to meet different stakeholder needs. With our expertise in defining cubes, dimensions and layers, we help our customers extract the most value from their investments in DWH.

TriumphSys maintains current skills in the following DWH reporting technologies like BusinessObjects, Cognos, Microstrategy, Actuate, SSRS etc.

With a sharp focus on the constantly evolving field of DWH technologies as well as building business and domain expertise, we provide end-to-end architecture, development, deployment and maintenance services to our customers to help them exploit the DWH capabilities to the fullest in taking their business to the next level.
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When you select Krishnamrutam Infotech for your website design, you'll be selecting a professional web design and development company that prides itself on supplying visually stunning best custom website design that helps your business work, grow and progress better. Because successful web design requires several elements, innovative engaging graphical design, fast stable performance, a clear focus on functionality, client satisfaction and usability. We are proud to say that we have all these things. Clean website design that keeps your visitors happy, and a professional custom web design solution that has our clientele doing more business online than ever before.
Web Design Company

Krishnamrutam Infotech as a web design company we provide website designing at affordable prices with high quality. If you are looking for a professional website designing and development company then you've come to the right place for web design company and web development company.
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