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00: 13 Data Warehouse interview Q&As – Fact Vs Dimension, CDC, SCD, etc

Q1. What is dimensional modelling in a Data Warehouse (i.e. DWH)?
A1. A dimensional model is a data structure technique optimised …

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00: Apache Spark eco system & anatomy interview Q&As

Q01. Can you summarise the Spark eco system?
A01. Apache Spark is a general purpose cluster computing system. It provides high-level …

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00: Data Lake Vs. Data Warehouse Vs. Delta Lake

Modern data architectures will have both the Data Lakes & Data Warehouses.

Q1. What questions do you need to ask for …

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00: Q1 – Q6 Hadoop based Big Data architecture & basics interview Q&As

There are a number of technologies to ingest & run analytical queries over Big Data (i.e. large volume of data). Big …

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01: Lambda, Kappa & Delta Data Architectures Interview Q&As – Overview

Q1. What is the Lambda Architecture? A1. It is a data-processing architecture designed to handle Big Data by using both real-time … … Read more ›...

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01: Q01 – Q07 General Big Data, Data Science & Data Analytics Interview Q&As

Q01. How is Big Data used in industries?
A01. The main goal for most organisations is to enhance customer experience, and …

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02: Cleansing & pre-processing data in BigData & machine learning with Spark interview Q&As

Q1. Why are data cleansing & pre-processing important in analytics & machine learning? A1. Garbage in gets you garbage out. No … … Read more ›...

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02: Q7 – Q15 Hadoop overview & architecture interview Q&As

This extends Q1 – Q6 Hadoop Overview & Architecture interview Q&As. Q7. What are the major machine roles in a … … Read more ›...

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03: Q16 – Q26 Hadoop MapReduce interview questions & answers

This extends 02: Hadoop overview & architecture interview Q&As. Q16. What is MapReduce (i.e MR)? A16. MapReduce is a parallel … … Read more ›...

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03: Simple Linear Regression interview Q&As

Q01. What is a gradient? A01. In algebra we can represent a straight line with: y = mx + c… … Read more ›...

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04: Residuals, Cost/Loss functions, R-squared & Gradient Descent interview Q&As

Q01. What do you understand by the terms mean, variance, and standard deviation of the sample Vs. the … … Read more ›...

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05: ETL & ELT architecture interview Q&As

Q1. What is an ETL process? A1. ETL is a architectural style, and it stands for Extract, Transform and … … Read more ›...

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05: Linear regression outputs, null hypothesis, t-test & p-value interview Q&As

Q1. How do you produce & interpret Linear Regression output? A1. Scatter plots can only detect obvious relationships between variables by … … Read more ›...

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Java FAQs to Fast-track & Go places

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