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Questions and Answers
What is a key feature of NoSQL databases related to scaling?
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?
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?
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?
Which type of NoSQL database is known for storing data in nodes and edges?
What does a flexible schema allow in NoSQL databases?
What does a flexible schema allow in NoSQL databases?
How do key-value databases store data?
How do key-value databases store data?
In a relational database, how many tables would likely be created to store information about a user and their hobbies?
In a relational database, how many tables would likely be created to store information about a user and their hobbies?
What is a key advantage of using a document database like MongoDB for storing information about a user and their hobbies?
What is a key advantage of using a document database like MongoDB for storing information about a user and their hobbies?
What is one of the differences between RDBMS and NoSQL databases listed in the text?
What is one of the differences between RDBMS and NoSQL databases listed in the text?
When should NoSQL databases be used according to the text?
When should NoSQL databases be used according to the text?
What operator would you use in MongoDB to retrieve data where the 'Max_Speed' is greater than 100?
What operator would you use in MongoDB to retrieve data where the 'Max_Speed' is greater than 100?
What type of data storage is highlighted as suitable for NoSQL databases in the text?
What type of data storage is highlighted as suitable for NoSQL databases in the text?
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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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