Most Frequently asked Redshift Interview Questions and Answers (2020) | TechGeekNext >>







Most Frequently asked Redshift Interview Questions and Answers (2020)


In this post, questions from Amazon Redshift will be answered for Experienced and Freshers. We're trying to share our experience and learn how to help you make progress in your career.

Q: What is Amazon Redshift ?
Ans:

AWS Redshift is a Cloud-based data warehouse service. Redshift is a petabyte scale, powerful and fully managed relational data warehousing service.

An Amazon Redshift data warehouse is a collection of computing resources called nodes, which are organized into a group called a cluster. Each cluster runs an Amazon Redshift engine and contains one or more databases. Amazon Redshift provides efficient storage and faster database efficiency through specific properties such as massively parallel processing, columnar data storage, and multiple encoding schemes for data compression. Redshift can connect to JDBC client applications with ODBC connections. It is based on the PostgreSQL standard.

Q: Where and When Redshift can be used?
Ans:

Big customers are heading towards service on data warehouse today. Redshift can be used in different sectors, business use cases seeking a data warehouse cloud service with features such as cost savings, efficient dynamic query engine, security etc.

Clients looking for moving from on premise to cloud model, PaaS model. Traditional setup of servers, data centers for a company was headache. This requires upfront planning, estimation, prediction of servers, type of servers etc. and eventually takes months to come to a conclusion. Any wrong estimation or decision can lead to over or short of the estimated capacity and financial loss or short of resources. Following are business use cases or industries where Redshift can be used:-

  • Consolidation of accounting data : Redshift can be used to consolidate the data to see the company’s financial position at company level. Redshift math, analytic, date functions along with user in-built functions to derive various formula and complex customized calculations with optimized performance are very valuable features for accounting
  • Build Data Lake for pricing data : Redshift’s columnar storage is best fit for time series data.
  • Supply chain management : To query and analyze huge volume of data feature like parallel processing with powerful node types make Redshift a good option

Q: What is a data warehouse and how does AWS Redshift helps?
Ans:

A data warehouse is designed as a warehouse where the data from the systems and other sources generated by the organization are collected and processed.

At high level data warehouse has three-tier architecture:

  1. In the bottom tier, we have the tools which cleanse and collect the data.
  2. In the middle level, we have tools to transform the data using the Online Analytical Processing Server.
  3. At the top level, we have different tools where data analysis and data mining are carried out at the front end.
As data growing continuously in an organization and the company constantly has to update its expensive storage servers. Here AWS Redshift is generated in the cloud-based warehouses offered by Amazon where businesses store their data.

Q: What are benifits of Amazon Redshift ?
Ans:

AWS Redshift has below main benifits compare to other options :
  1. AWS Redshift is easy to operation : you can find an choice to build a cluster in the AWS Redshift Console. Only press and leave the rest on the Redshift computer program. Just complete the correct information and start the cluster. The cluster is now ready to be used, for example to control, track and scale Redshift.
  2. Cost Effective: Because there is no need to set up, the cost of this warehouse is reduced to 1/10th.
  3. Scaling of Warehouse is very easy: You just have to resize the cluster size by increasing the number of compute nodes.
  4. High performance: It uses such techniques such as column storage and large simultaneous processing techniques to produce high efficiency and responsiveness times.

Q: What are benifits of Amazon Redshift ?
Ans:

AWS Redshift has below main benifits compare to other options :
  1. AWS Redshift is easy to operation : you can find an choice to build a cluster in the AWS Redshift Console. Only press and leave the rest on the Redshift computer program. Just complete the correct information and start the cluster. The cluster is now ready to be used, for example to control, track and scale Redshift.
  2. Cost Effective: Because there is no need to set up, the cost of this warehouse is reduced to 1/10th.
  3. Scaling of Warehouse is very easy: You just have to resize the cluster size by increasing the number of compute nodes.
  4. High performance: It uses such techniques such as column storage and large simultaneous processing techniques to produce high efficiency and responsiveness times.

Q: How you query Amazon Redshift to show your table data?
Ans:

Below is the command to list tables in a public schema :
SELECT DISTINCT employee
FROM pg_table_def
WHERE schemaname = 'public'
ORDER BY employee;

# Below is the command to describe the columns from a table called table_data

SELECT *
FROM pg_table_def
WHERE tablename = 'employee'
AND schemaname = 'public';


















































































































Recommendation for Top Popular Post :