Cloud Computing Quiz: MongoDB NoSQL Database Flashcards

What is the primary data structure used in document databases?

What is the purpose of the map phase in MongoDB's map-reduce operation?

What is the role of the reduce phase in MongoDB's map-reduce operation?

What is the default programming language used for writing map-reduce functions in MongoDB?

What is the purpose of the 'out' parameter in MongoDB's map-reduce operation?

What is the purpose of the 'query' parameter in MongoDB's map-reduce operation?

What is the primary difference between relational databases and NoSQL databases?

What are the types of NoSQL databases mentioned in the text?

What is a collection in a document database?

What is the main difference between document databases and key-value databases?

What is the purpose of MongoDB Map-Reduce functions in the given problem statement?

What operations are to be performed on the NoSQL document-oriented database in the given problem statement?

NoSQL Databases

NoSQL databases store data differently than relational tables and provide flexible schemas.
They scale easily with large amounts of data and high user loads.

Document Databases

Organize documents into groups called collections, analogous to tables in relational databases.
Maintain sets of key-value pairs within a document.
Examples: MongoDB.

MongoDB

A document-oriented NoSQL database.
Uses MongoDB commands/operations such as:
- use db to switch to a database.
- help to display command help.
- show dbs to list available databases.
- show collections to list available collections.
- db.createCollection(“sample”) to create a new collection.
- db.sample.insertOne() and db.sample.insertMany() to insert documents.
- db.sample.find() to retrieve documents.
- updateOne() and updateMany() to update documents.
- deleteOne() and deleteMany() to delete documents.

MongoDB and Map-Reduce

Map-reduce is a data processing paradigm for condensing large volumes of data into useful aggregated results.
MongoDB uses the mapReduce command for map-reduce operations.
The map phase applies to each input document, emitting key-value pairs.
The reduce phase collects and condenses aggregated data for keys with multiple values.
All map-reduce functions in MongoDB are JavaScript functions:
- map maps a value with a key and emits a key-value pair.
- reduce reduces or groups all documents having the same key.
- out specifies the location of the map-reduce query result.
- query specifies the optional selection criteria for selecting documents.

This quiz is based on a laboratory assignment on cloud computing that focuses on creating a NoSQL document-oriented database in MongoDB. It covers various operations on the database, including creating a database and performing different tasks. Test your knowledge of MongoDB and NoSQL databases with this quiz.