Q1. What is AWS Athena? What are its capabilities? A1. Amazon Athena is an interactive query service that makes it easy to analyse data in Amazon S3 buckets using standard SQL. Athena is serverless, … Read more ›...
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Apache Hive for Slowly Changing Dimension (i.e. SCD) interview Q&As
Q1. What is a Slowly Changing Dimension (i.e. SCD)? A1. SCD means the dimensions that change slowly over time, rather than changing on regular basis. For example, change in customer name or address. There are different types of changing dimensions, and type 1 & … Read more ›...
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Apache Spark SQL join types interview questions and answers
Q1. What are the different Spark SQL join types?
A1. There are different SQL join types like inner join, left/right outer joins, full outer join, left semi-join, left anti-join and self-join.
Q2. Given the below tables, can give examples of the above join types?
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AWS CI/CD interview questions & answers
Over the last few years the number of AWS services that are related to building, managing or deploying software projects on AWS has grown a lot — AWS Amplify, AWS App Runner, AWS Elastic Beanstalk, AWS Code family like CodePipeline, CodeCommit, CodeBuild, CodeStar, CodeArtifact, and Amazon CodeCatalyst. This post does...
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AWS Data pipeline architecture interview Q&As
What is a data pipeline in cloud? A data pipeline is a means of moving data from one place (E.g source systems) to another (E.g. target/destination). The data is transformed and optimized along the way so that it can be analyzed and used to develop business insights. … Read more...
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AWS Interview Q&As on ECS, EKS & Fargate
As the demand for containerised applications continues to grow, expertise in AWS ECS has become increasingly valuable for software & data engineers. Q01. What are the benefits of container orchestration services? A02. Container orchestration automates container deployment, management, scaling, and networking. Orchestration tools manage these complexities, … Read more ›...
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AWS Web Application Security Q&As
Below questions are based on the above diagram, and extends AWS Q&As on VPC, Subnets, Availability Zones, VPN, Route tables, NACLs & Security Groups & 15+ AWS Services overview interview Q&As. Q1. What is the purpose WAF in AWS? … Read more ›...
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Azure Data Factory vs AWS Glue Interview Q&As
Q01. What is the difference between Azure Data Factory and AWS Glue? A01. Azure Data Factory and AWS Glue are two competing serverless PaaS (i.e. Platform as a Service) based ETL and ELT solutions from two major cloud providers Azure and AWS respectively. … Read more ›...
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Big Data – governance & metadata management interview Q&As
Q01. What are the key pillars of Data Governance? A01. The 5 key pillars of any Data Governance are: 1) Security & privacy – Who can access it? Personally identifiable information (i.e. PII) (i.e. any data that could potentially identify a specific individual? … Read more ›...
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Building idempotent data pipelines interview questions & answers
Q01. What is an idempotent data operation? A01. Idempotent operations produce the same result even when the operation is repeated many times. A pipeline that reads data from a number of source systems and loads it into target RDBMs tables more than once for a given day can result in...
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Canonical Data Model (i.e. CDM) interview Q&As
Q01. What do you understand by the term canonicalizing? A01. Canonicalizing is an activity of replacing multiple copies of an object/entity/URL with just a few objects/entities/URLs. A canonical URL is a good example. If you have a single page that’s accessible by multiple URLs, … Read more ›...
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Common Table Expressions (i.e. CTE) in SQL using the “WITH” clause & RECURSIVE CTE
Common Table Expressions or CTE’s for short are used in SQL to simplify complex joins and subqueries, and to provide a means to query hierarchical data such as an organisational chart. This was also introduced in MySQL 8 – Using https://www.db-fiddle.com/. … Read more ›...
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Data categories in Data warehouse & Data lake
Q01. What are the different types of data that get stored in a data lake or data warehouse? A01. An enterprise stores different types of data. #1. Transactional Data Transactional data describes business events like placing an order. Example 1: If you take a Telecom service provider there could be...
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