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10: ♥ Q80 – Q87 HBase Schema Design Interview Questions & Answers

Q80. Why is schema design for HBase is different from relational database design? A80. HBase is a columnar NoSQL database. This means no two rows in a table need to have the same columns. In a columnar database table, each row contains cells containing

Values are stored against each

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Posted in Hadoop & BigData Interview Q&A, NoSQL

YAML with Java using the SnakeYaml library tutorial

Step 1: Add “snakeyaml” to maven pom.xml as a dependency

Step 2: Define a YAML file under src/main/resources. For example, “logging.yml”

Step 3: Create a LoggingConfiguration Java POJO class.

Step 4: Finally, the main class that uses the Yaml library to read the configuration from the “logging.yml”

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Posted in YAML, YAML Tutorial

3. Understanding HBase (NoSQL) database basics in 7 steps

Extends Getting started with HBase. HBase is a NoSQL database. HBase is a columnar database. #1. In HBase, you create the Table & column-families “create” command to create a table with column families. You can later on use “alter” to add more column families.

Add column family “m” to…...

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Posted in HBase Tutorials, member-paid, NoSQL

YAML with Spring & Java Q&As

Q1. What is YAML? A1. YAML Ain’t Markup Language. It is a human friendly data serialization standard for all programming languages. A YAML file has an extension of “.yml“. Q2. What are the 3 rules of YAML? A2. Rule 1: Indentation YAML uses a fixed indentation scheme to represent relationships

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Posted in YAML

JSON, Jackson, and Maven example

Step 1: Create a new simple-json project using Maven CLI.

press “Enter” for all the prompts. This creates a new “simple-json” folder with MVN artefacts like pom.xml, etc. Step 2: Import the maven project into your IDE. E.g. in eclipse File –> Import –> Existing Maven Projects and browse…...

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11 FAQ XSD interview questions and answers

Q1. How do you restrict an element in XSD? A1. With “xs:restriction”. In the XSD shown below, the “AddressType” is restricted to “Mailing”, “Office”, and “Home”.

Q2. Can you explain as per the XSD shown above the term “targetNamespace”? A2. Placing the targetNamespace attribute at the top of your…...

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♦ 10 ERD (Entity-Relationship Diagrams) Interview Questions and Answers

Q1. What is an ERD? A1. ERD or Entity-Relationship Diagram, is a chart that visually represents the relationship between database entities. ERDs model an organization’s data storage requirements with three main components: entities, attributes, and relationships. As UML is for charting the relationships and interactions among Java entities like classes…...

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XSD reuse interview questions and answers

#1. Reuse by defining a “ComplexType”. EmployeeType is reused.

Once JAXB annotated classes are created

XML output:

#2. Inheritance reuse where sub types can define additional elements like “salary”, “contractRate”, etc.

Once the JAXB annotated classes are created

XML output:

#3. using “substitutionGroup”

…...

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