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00: 13 Data Warehouse interview Q&As – Fact Vs Dimension, CDC, SCD, etc – part 1

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

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00: 13 Data Warehouse interview Q&As – Fact Vs Dimension, CDC, SCD, etc – part 2

This extends Q1 to Q5 at 13 Data Warehouse interview Q&As – Fact Vs Dimension, CDC, SCD, etc – part 1. Q6. … Read more ›...



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 API in Java,

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

Modern data architectures will have both the Data Lakes & Data Warehouses. The Data Engineers build the data pipelines for the data analysts and scientists to build business reports &

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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 Data is used in Business Intelligence (i.e. BI) reporting,

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01: Getting started with Zookeeper tutorial

Installing Zookeepr on Windows Step 1: Download Zookeeper from http://zookeeper.apache.org/. At the time of writing downloading zookeeper-3.4.11.tar.gz. Step 2: Using 7-zip on windows unpack the gzipped tar file into a...



01: Apache Flume with JMS source (Websphere MQ) and HDFS sink

Apache Flume is used in the Hadoop ecosystem for ingesting data. In this example, let’s ingest data from Websphere MQ. Step 1: Apache flume is config driven. … Read more...



01: Apache Hadoop HDFS Tutorial

Step 1: Download the latest version of “Apache Hadoop common” from http://apache.claz.org/hadoop using wget, curl or a browser. This tutorial uses “http://apache.claz.org/hadoop/core/hadoop-2.7.1/”.

Step 2: You can set Hadoop environment variables by appending the following commands to ~/.bashrc file.

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01: Coding “Java way in Scala” Vs “Scala way in Scala”

Example #1: Read from a list & write to a list

Java Way in Scala

Output: List(Java Programming, Scala Programming,

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01: Databricks getting started – Spark, Shell, SQL


Step 1:
Signup to Databricks community edition – https://databricks.com/try-databricks. Fill in the details and you can leave your mobile number blank. Select “

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