Introduction to NoSQL Databases Quiz

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Questions and Answers

What is a key feature of NoSQL databases related to scaling?

  • Diagonal scaling
  • Circular scaling
  • Horizontal scaling (correct)
  • Vertical scaling

Which type of NoSQL database stores data in tables, rows, and dynamic columns?

  • Key-value database
  • Graph database
  • Document database
  • Wide-column store (correct)

What is a key characteristic of document databases in NoSQL?

  • Utilize keys and values
  • Store data in tables
  • Store data in JSON-like documents (correct)
  • Organize data in nodes and edges

Which type of NoSQL database is known for storing data in nodes and edges?

<p>Graph database (D)</p> Signup and view all the answers

What does a flexible schema allow in NoSQL databases?

<p>Easier changes to the database structure (B)</p> Signup and view all the answers

How do key-value databases store data?

<p>With keys and values (B)</p> Signup and view all the answers

In a relational database, how many tables would likely be created to store information about a user and their hobbies?

<p>Two tables (B)</p> Signup and view all the answers

What is a key advantage of using a document database like MongoDB for storing information about a user and their hobbies?

<p>Retrieving all information with a single document (A)</p> Signup and view all the answers

What is one of the differences between RDBMS and NoSQL databases listed in the text?

<p>Relational databases have more support for transactions (D)</p> Signup and view all the answers

When should NoSQL databases be used according to the text?

<p>For modern application paradigms like microservices (C)</p> Signup and view all the answers

What operator would you use in MongoDB to retrieve data where the 'Max_Speed' is greater than 100?

<p>$gt (A)</p> Signup and view all the answers

What type of data storage is highlighted as suitable for NoSQL databases in the text?

<p>Huge volumes of data and semi-structured data (B)</p> Signup and view all the answers

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Study Notes

NoSQL Databases

  • NoSQL databases store data differently than relational tables, providing flexible schemas and scaling easily with large amounts of data and high user loads.
  • They come in various types, including document, key-value, wide-column, and graph databases.

Features of NoSQL Databases

  • Flexible schemas, allowing for easy changes to the database as requirements change.
  • Horizontal scaling, enabling the database to scale-out easily.
  • Fast queries, as data that is accessed together is stored together.
  • Ease of development, with mapping allowing developers to write less code and reducing bugs.

Types of NoSQL Databases

  • Document databases, storing data in documents similar to JSON objects.
  • Key-value databases, storing data in simple key-value pairs.
  • Wide-column stores, storing data in tables with dynamic columns.
  • Graph databases, storing data in nodes and edges.

RDBMS vs NoSQL: Data Modeling

  • In a relational database, data is stored in separate tables (e.g., Users and Hobbies).
  • In a document database (e.g., MongoDB), data is stored in a single document, eliminating the need for joins.

Retrieving Data in NoSQL

  • A single document can be retrieved, containing all information about a user and their hobbies.
  • No joins are required, resulting in faster queries.

Differences between RDBMS and NoSQL

  • Flexibility of the schema
  • Scaling technique
  • Support for transactions
  • Reliance on data to object mapping

Why NoSQL?

  • Used in critical applications, such as financial data and healthcare records, to fun and frivolous applications, like IoT readings from a smart kitty litter box.
  • Suitable for fast-paced Agile development, storing structured and semi-structured data, and huge volumes of data, requiring scale-out architecture and modern application paradigms.

Querying in NoSQL

  • Examples of NoSQL queries, using operators such as $gt, $eq, $gte, $lte, $lt, and $ne.

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