NoSQL Database Fundamentals
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Questions and Answers

Which statement most accurately describes ACID properties in database systems?

  • ACID properties allow for eventual consistency in data.
  • ACID encompasses Atomicity, Consistency, Isolation, and Durability. (correct)
  • ACID properties ensure data is temporary and can be lost.
  • ACID is primarily focused on scalability and availability.
  • What is a key feature of document-based NoSQL databases?

  • They only support structured data.
  • They require a fixed schema and data types.
  • They store data in documents and collections. (correct)
  • They normalize data across multiple tables.
  • Which NoSQL database type is primarily designed to handle connected data with relationships?

  • Key-value store
  • Graph database (correct)
  • Column-family database
  • Document database
  • Which of the following correctly represents the BASE properties associated with NoSQL systems?

    <p>Basic Availability, Soft state, Eventually consistent.</p> Signup and view all the answers

    In the context of NoSQL databases, what distinguishes key-value stores from document databases?

    <p>Key-value stores associate data using only two columns.</p> Signup and view all the answers

    What is the effect of the command 'db.collection_name.find()'?

    <p>It retrieves all records from the collection.</p> Signup and view all the answers

    Which method is used to insert a single record into a MongoDB collection?

    <p>insertOne()</p> Signup and view all the answers

    If you want to update multiple records in a collection, which command would you use?

    <p>updateMany()</p> Signup and view all the answers

    What syntax correctly deletes a single record from a collection?

    <p>db.collection_name.deleteOne({_id: 1})</p> Signup and view all the answers

    When using the find() method with a specific field, how do you specify the fields to return?

    <p>By adding a second parameter with field specifications.</p> Signup and view all the answers

    What function does the '$set' operator have in an update command?

    <p>It specifies which fields to modify.</p> Signup and view all the answers

    Which command would you use to view existing databases in MongoDB?

    <p>show databases</p> Signup and view all the answers

    Which method would you use to retrieve specific records where a field matches a value?

    <p>db.collection_name.find({field: value})</p> Signup and view all the answers

    Study Notes

    NoSQL Overview

    • NoSQL is a family of non-relational databases
    • Non-relational databases do not rely on primary-secondary key relationships
    • This contrasts with SQL databases

    NoSQL Advantages

    • Handles unstructured data storage
    • Provides scalability (ability to handle increasing data volumes by adding more servers)
    • Offers high availability (functions continuously without interruption)
    • Enables fast development (supports agile environments requiring constant feedback and fast iterations)
    • Enables management for large amounts of unstructured data

    ACID vs BASE

    • ACID properties are used in Relational Databases (SQL)
      • Atomicity - Transactions occur as a whole (all or nothing)
      • Consistency - Data remains consistent across all users
      • Isolation - Transactions do not affect each other
      • Durability - Data is persistent even during failures
    • BASE properties are used in Non-Relational Databases (NoSQL)
      • Basically Available - Opposite of Isolation
      • Soft state - Data may be in intermediate states
      • Eventually consistent - Data eventually becomes consistent

    NoSQL Types

    • Document (stores data in documents and collections)
    • Key-value (stores data in key-value pairs)
    • Column-family (stores data in columns indexed by rows)
    • Graph (stores data in nodes connected by relationships)

    Document Databases (Example: MongoDB)

    • Stores data in documents and collections
    • Enables storing all data about one object in a single document/collection (eliminating the need to separate into multiple parts)

    Key-Value Databases

    • Stores data as key-value pairs
    • Intermediate storage type between SQL and Document databases

    Column-Family Databases

    • Stores data in columns
    • Allows different kinds of data to be stored in various rows (flexible)

    Graph Databases

    • Stores data in connected nodes
    • Useful for representing relationships and connections between data points

    Use Cases for Different NoSQL Types

    • Use a document database for social media or content management systems.
    • Use a key-value database for caching or simple data storage.
    • Use a column-family database for storing data with varying row structures
    • Use a graph databases for relationships in social networks

    MongoDB CRUD Operations

    • CRUD stands for Create, Read, Update, Delete
    • find() - Used to retrieve documents fulfilling specified criteria
    • insertOne() - Used to insert a single document
    • insertMany()- Used to insert multiple documents
    • updateOne() - Used to update a matching document
    • updateMany() - Used to update multiple matching documents
    • deleteOne()- Used to delete a document
    • deleteMany()- Used to delete multiple documents

    MongoDB Commands

    • show dbs — Displays available databases
    • use database_name — Selects a specific database
    • show collections — Displays collections in a database

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    Description

    Explore the basics of NoSQL databases, including their advantages over traditional SQL databases. Learn about key concepts such as unstructured data management, scalability, and the differences between ACID and BASE properties. This quiz will deepen your understanding of modern data storage solutions.

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