Big Data and NoSQL Overview
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Questions and Answers

What are nodes in graph databases similar to in the relational model?

  • Foreign keys
  • Tables
  • Functions
  • Instances of an entity (correct)

    • Which statement best describes the role of edges in graph databases?

  • Edges are tags that categorize data within nodes.
  • Edges define the relationships between nodes. (correct)
  • Edges are data types used to enhance queries.
  • Edges represent different document formats.

    • In graph databases, what do properties refer to?

  • Attributes that describe nodes and edges (correct)
  • The methods used to query data
  • The physical storage of data
  • The various types of databases

    • Which data type is NOT mentioned as a format for documents in graph databases?

    <p>CSV</p> Signup and view all the answers

    What is one of the primary advantages of graph databases?

    <p>They are better suited for tracking interrelated data.</p> Signup and view all the answers

    What does the key in a key-value database represent?

    <p>An identifier for the value</p> Signup and view all the answers

    Which characteristic does NOT describe big data?

    <p>Low cost</p> Signup and view all the answers

    In a key-value database, how are relationships among data tracked?

    <p>No relationships can be tracked</p> Signup and view all the answers

    What type of data is primarily associated with big data?

    <p>Unstructured or semi-structured data</p> Signup and view all the answers

    What is the primary job of applications that use data in key-value databases?

    <p>Understand the meaning of the data</p> Signup and view all the answers

    Which of the following best describes the properties of key-value databases?

    <p>They do not track relationships among keys</p> Signup and view all the answers

    What is a key characteristic of the 'volume' aspect of big data?

    <p>Quantitative measure of data to be stored</p> Signup and view all the answers

    What kind of content can a value in a key-value database contain?

    <p>Anything such as text, images, or documents</p> Signup and view all the answers

    What is the age of Justin York?

    <p>27</p> Signup and view all the answers

    In which city does Justin York reside?

    <p>Makati</p> Signup and view all the answers

    What type of database is MongoDB?

    <p>Document-oriented database</p> Signup and view all the answers

    Which contact method is NOT listed for Justin York?

    <p>Home phone</p> Signup and view all the answers

    What feature is highlighted for MongoDB?

    <p>High performance</p> Signup and view all the answers

    How is Justin York's email formatted?

    <p><a href="mailto:[email protected]">[email protected]</a></p> Signup and view all the answers

    What characteristic of MongoDB allows it to handle large amounts of data?

    <p>High availability</p> Signup and view all the answers

    Which country is Justin York from?

    <p>Philippines</p> Signup and view all the answers

    What advantage does column-centric storage have over row-centric storage?

    <p>It improves access speed for required column groups.</p> Signup and view all the answers

    Which characteristic is NOT typically associated with NoSQL databases?

    <p>Use of SQL as the primary query language</p> Signup and view all the answers

    In the context of big data, what does 'variety' refer to?

    <p>The different types of data formats and structures.</p> Signup and view all the answers

    How does a key-value database structure its data?

    <p>As pairs of keys and values.</p> Signup and view all the answers

    What is a primary reason to use NoSQL databases?

    <p>To store unstructured or semi-structured data.</p> Signup and view all the answers

    What is a key feature of NoSQL that makes it suitable for social media applications?

    <p>Ease of use and scalability.</p> Signup and view all the answers

    What does the term 'column family' refer to in NoSQL databases?

    <p>A storage unit grouping related columns.</p> Signup and view all the answers

    Which statement about NoSQL technologies is correct?

    <p>They can handle high volumes of data in distributed systems.</p> Signup and view all the answers

    What distinguishes document-oriented databases from traditional key-value databases?

    <p>They use tagged documents in key-value pairs.</p> Signup and view all the answers

    In the context of MongoDB, what is a collection most similar to?

    <p>A table in a relational database.</p> Signup and view all the answers

    How is a document defined in MongoDB?

    <p>It is the basic unit of data that can contain multiple fields.</p> Signup and view all the answers

    What is the role of the _id key in a MongoDB document?

    <p>It is a unique identifier across the document's collection.</p> Signup and view all the answers

    What is a key feature of document-oriented databases?

    <p>They allow for variable structures within documents.</p> Signup and view all the answers

    What does a MongoDB database typically contain?

    <p>Multiple collections.</p> Signup and view all the answers

    When interacting with MongoDB, what command is used to view the list of databases?

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

    What is a characteristic of the collections in a MongoDB database?

    <p>Collections can have dynamic schemas.</p> Signup and view all the answers

    What command is used to switch to a specific database in MongoDB?

    <p>use &lt;db_name&gt;</p> Signup and view all the answers

    Which command lists all the databases in MongoDB?

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

    When does MongoDB automatically create a database?

    <p>When a document is saved to a collection for the first time</p> Signup and view all the answers

    To see the currently selected database in MongoDB, which command is used?

    <p>db</p> Signup and view all the answers

    Which of the following commands can be used to display the collections of a database?

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

    What occurs after creating a document in a MongoDB collection for the first time?

    <p>The collection is automatically created</p> Signup and view all the answers

    What is the purpose of the 'db.student.find()' command?

    <p>To query student documents in the student collection</p> Signup and view all the answers

    In which format does MongoDB display queried documents?

    <p>JSON</p> Signup and view all the answers

    Study Notes

    Big Data and NoSQL

    • Big data refers to large volumes of data exceeding the capacity of traditional software.
    • This data is often unstructured or semi-structured, originating from various sources like social media and emails.
    • Key characteristics of big data include volume (quantity), velocity (rate of entry), and variety (formats).
    • NoSQL databases, a new generation, differ from traditional relational SQL databases in storing data (not in tables) and using non-SQL languages.
    • NoSQL, often interpreted as 'Not only SQL,' uses alternative technologies to store big data and is particularly useful for applications requiring high availability, as seen in social media services.
    • NoSQL excels in ease of use, scalability, resilience, and availability.
    • NoSQL stores unstructured or semi-structured data, frequently in key-value pairs or JSON documents.

    NoSQL Data Models

    • Key-Value (KV) Databases:

      • Simplest NoSQL model.
      • Stores data as key-value pairs.
      • The key acts as an identifier for the value.
      • Values can be anything like text, images, or XML documents.
      • The database doesn't analyze the value; applications do.
      • Lack of foreign keys simplifies processing, making KV databases fast and scalable for basic functions.

    • Column-Oriented Databases:

      • Relies on traditional relational database technology but stores data column-wise (column families) instead of row-wise.
      • Optimizes read operations, as often only specific columns are needed.
      • Useful for storing large volumes of data where frequently accessed related columns are grouped.

    • Graph Databases:

      • Based on graph theory.
      • Represents data through nodes (entities) and edges (relationships).
      • Edges describe node relationships with attributes.
      • Useful for highly interconnected data, like social media networks.

    • Document-Oriented Databases:

      • Similar to key-value databases; data in tagged documents.
      • Stores data in flexible JSON format.
      • Documents can have varying column structures across documents.
      • Suitable for applications that require dynamic data schemas.

    Document-Oriented Database Example - MongoDB

    • Data Structure:

      • Documents are the basic data unit, similar to rows but with a flexible schema.
      • Each document has a unique id key.
      • Documents are stored in collections, analogous to tables.

    • Operations:

      • New databases are created automatically if they do not already exist.
      • The db command displays the currently selected database.
      • The show dbs command lists databases.
      • Inserting documents, similar to creating rows in a relational database but more flexible.
      • Querying documents (e.g., using find()).
      • Removing documents or collections.

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    Description

    Explore the world of Big Data and NoSQL databases in this quiz. Learn about the characteristics of Big Data, the differences between traditional SQL and NoSQL databases, and the unique data models used in NoSQL, such as key-value pairs. Test your understanding and knowledge about these critical technologies shaping data management today.

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