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CouchDB MCQs and Answers With Explanation – CouchDB is a document-oriented NoSQL database that uses JSON to store data. It provides a flexible and scalable solution for storing and querying semi-structured data. CouchDB is known for its simplicity and ease of use, making it a popular choice for web and mobile applications. This set of CouchDB MCQs focuses on various aspects of CouchDB, including its architecture, data model, query language, and security features.
CouchDB MCQs
These CouchDB Multiple Choice Questions are designed to test your knowledge of CouchDB and help you better understand its functionality and capabilities. Whether you are a developer, data analyst, or database administrator, this CouchDB Quiz will challenge your understanding of CouchDB and provide valuable insights into its features and capabilities.
CouchDB Multiple Choice Questions and Answers
| Quiz Name | CouchDB |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 50 CouchDB MCQs | Practice Online Quiz
1. What is CouchDB?
A. A NoSQL document database
B. A relational database management system
C. A graph database
D. A key-value store
Answer: A.
Explanation – CouchDB is a NoSQL document database that uses JSON to store and retrieve data.
2. Who developed CouchDB?
A. Google
B. IBM
C. Apache Software Foundation
D. Microsoft
Answer: C.
Explanation – CouchDB was developed by the Apache Software Foundation.
3. What is the primary language used to interact with CouchDB?
A. SQL
B. Python
C. JavaScript
D. Ruby
Answer: C.
Explanation – JavaScript is the primary language used to interact with CouchDB.
4. What is the default port number for CouchDB?
A. 5984
B. 5432
C. 3306
D. 27017
Answer: A.
Explanation – The default port number for CouchDB is 5984.
5. What is the name of the query language used by CouchDB?
A. SQL
B. CouchQL
C. Mango
D. CQL
Answer: C.
Explanation – Mango is the query language used by CouchDB.
6. What is a document in CouchDB?
A. A row in a table
B. A column in a table
C. A unit of data
D. A collection of tables
Answer: C.
Explanation – A document in CouchDB is a unit of data that is stored and retrieved as a JSON object.
7. What is a view in CouchDB?
A. A predefined query that returns a subset of data
B. A collection of documents
C. A data model
D. A database schema
Answer: A.
Explanation – A view in CouchDB is a predefined query that returns a subset of data from the database.
8. What is the purpose of a design document in CouchDB?
A. To define the structure of a database
B. To specify the data model
C. To create views and indexes
D. To define the query language
Answer: C.
Explanation – A design document in CouchDB is used to create views and indexes for the database.
9. What is a reduce function in CouchDB?
A. A function that filters data
B. A function that sorts data
C. A function that groups and aggregates data
D. A function that selects data
Answer: C.
Explanation – A reduce function in CouchDB is used to group and aggregate data returned by a map function.
10. What is a replication in CouchDB?
A. The process of copying data from one database to another
B. The process of backing up a database
C. The process of restoring a database
D. The process of deleting a database
Answer: A.
Explanation – Replication in CouchDB is the process of copying data from one database to another.
11. Which of the following is a benefit of using CouchDB?
A. It provides strict schema validation
B. It is highly scalable
C. It supports complex transactions
D. It has a strict ACID compliance model
Answer: B.
Explanation – CouchDB is highly scalable and can handle large amounts of data.
12. What is a conflict in CouchDB?
A. When two documents have the same ID
B. When two documents have conflicting data
C. When two databases have the same name
D. When two queries return different results
Answer: B.
Explanation – A conflict in CouchDB occurs when two documents have conflicting data.
13. What is a replica in CouchDB?
A. A copy of a document in the same database
B. A copy of a document in a different database
C. A copy of a database
D. A copy of a view
Answer: B.
Explanation – A replica in CouchDB is a copy of a document in a different database.
14. What is the purpose of a list function in CouchDB?
A. To filter data returned by a view
B. To modify data returned by a view
C. To group data returned by a view
D. To aggregate data returned by a view
Answer: B.
Explanation – A list function in CouchDB is used to modify data returned by a view before it is sent to the client.
15. What is a spatial view in CouchDB?
A. A view that returns data based on geographic location
B. A view that returns data based on a specific range of values
C. A view that returns data based on a specific key
D. A view that returns data based on a specific attribute
Answer: A.
Explanation – A spatial view in CouchDB is a view that returns data based on geographic location.
16. What is a revision in CouchDB?
A. A unique identifier for a document
B. A version number for a document
C. A timestamp for a document
D. A combination of the above
Answer: D.
Explanation – A revision in CouchDB is a combination of a unique identifier, a version number, and a timestamp for a document.
17. What is the purpose of a validation function in CouchDB?
A. To ensure that data conforms to a specific schema
B. To ensure that data is consistent across multiple databases
C. To ensure that data is accurate
D. To ensure that data is secure
Answer: A.
Explanation – A validation function in CouchDB is used to ensure that data conforms to a specific schema.
18. What is a conflict resolver in CouchDB?
A. A function that resolves conflicts between documents
B. A function that resolves conflicts between databases
C. A function that resolves conflicts between views
D. A function that resolves conflicts between indexes
Answer: A.
Explanation – A conflict resolver in CouchDB is a function that resolves conflicts between documents.
19. Which of the following is a characteristic of a document in CouchDB?
A. It must have a predefined schema
B. It can have any number of fields
C. It must have a primary key
D. It can only contain string values
Answer: B.
Explanation – A document in CouchDB can have any number of fields.
20. What is a materialized view in CouchDB?
A. A view that is stored in memory
B. A view that is stored on disk
C. A view that is generated on-the-fly
D. A view that is generated at a specific time
Answer: B.
Explanation – A materialized view in CouchDB is a view that is stored on disk.
21. What is the purpose of a show function in CouchDB?
A. To return data in a specific format
B. To filter data returned by a view
C. To modify data returned by a view
D. To aggregate data returned by a view
Answer: A.
Explanation – A show function in CouchDB is used to return data in a specific format.
22. What is a security object in CouchDB?
A. An object that defines access control rules for the database
B. An object that defines the database schema
C. An object that defines the replication settings for the database
D. An object that defines the indexes for the database
Answer: A.
Explanation – A security object in CouchDB is an object that defines access control rules for the database.
23. What is the purpose of a view index in CouchDB?
A. To speed up queries on a view
B. To limit the amount of data returned by a view
C. To filter data returned by a view
D. To aggregate data returned by a view
Answer: A.
Explanation – The purpose of a view index in CouchDB is to speed up queries on a view by precomputing the results of a view and storing them in an index.
24. Which HTTP method is used to retrieve a document in CouchDB?
A. POST
B. GET
C. PUT
D. DELETE
Answer: B.
Explanation – The HTTP method used to retrieve a document in CouchDB is GET.
25. Which of the following is a characteristic of a database in CouchDB?
A. It must have a predefined schema
B. It can have any number of documents
C. It must have a primary key
D. It can only contain string values
Answer: B.
Explanation – A database in CouchDB can have any number of documents.
26. Which HTTP method is used to create a new document in CouchDB?
A. POST
B. GET
C. PUT
D. DELETE
Answer: A.
Explanation – The HTTP method used to create a new document in CouchDB is POST.
27. Which HTTP status code is returned when a document is successfully created in CouchDB?
A. 200
B. 201
C. 204
D. 404
Answer: B.
Explanation – The HTTP status code returned when a document is successfully created in CouchDB is 201.
28. What is the purpose of a filter function in CouchDB?
A. To filter data returned by a view
B. To modify data returned by a view
C. To group data returned by a view
D. To aggregate data returned by a view
Answer: A.
Explanation – A filter function in CouchDB is used to filter data returned by a view based on a specific condition.
29. Which HTTP method is used to update a document in CouchDB?
A. POST
B. GET
C. PUT
D. DELETE
Answer: C.
Explanation – The HTTP method used to update a document in CouchDB is PUT.
30. Which HTTP status code is returned when a document is successfully updated in CouchDB?
A. 200
B. 201
C. 204
D. 404
Answer: A.
Explanation – The HTTP status code returned when a document is successfully updated in CouchDB is 200.
31. Which HTTP method is used to delete a document in CouchDB?
A. POST
B. GET
C. PUT
D. DELETE
Answer: D.
Explanation – The HTTP method used to delete a document in CouchDB is DELETE.
32. Which HTTP status code is returned when a document is successfully deleted in CouchDB?
A. 200
B. 201
C. 204
D. 404
Answer: C.
Explanation – The HTTP status code returned when a document is successfully deleted in CouchDB is 204.
33. What is the purpose of a reduce function in CouchDB?
A. To filter data returned by a view
B. To modify data returned by a view
C. To group data returned by a view
D. To aggregate data returned by a view
Answer: D.
Explanation – A reduce function in CouchDB is used to aggregate data returned by a view.
34. Which of the following is a characteristic of a view in CouchDB?
A. It must have a predefined schema
B. It can have any number of map functions
C. It must have a primary key
D. It can only contain string values
Answer: B.
Explanation – A view in CouchDB can have any number of map functions.
35. What is a design document in CouchDB?
A. A document that defines the schema for a database
B. A document that defines access control rules for a database
C. A document that defines the replication settings for a database
D. A document that defines the views and other components for a database
Answer: D.
Explanation – A design document in CouchDB is a document that defines views and other components for a database.
36. Which of the following is a characteristic of a design document in CouchDB?
A. It must have a predefined schema
B. It can have any number of views
C. It must have a primary key
D. It can only contain string values
Answer: B.
Explanation – A design document in CouchDB can have any number of views.
37. Which HTTP method is used to create a new design document in CouchDB?
A. POST
B. GET
C. PUT
D. DELETE
Answer: C.
Explanation – The HTTP method used to create a new design document in CouchDB is PUT.
38. Which HTTP status code is returned when a design document is successfully created in CouchDB?
A. 200
B. 201
C. 204
D. 404
Answer: A.
Explanation – The HTTP status code returned when a design document is successfully created in CouchDB is 200.
39. Which of the following is a characteristic of a view index in CouchDB?
A. It is stored as a separate document in the database
B. It is always up-to-date with the data in the database
C. It can only be used to filter data in a view
D. It can only be used to sort data in a view
Answer: A.
Explanation – A view index in CouchDB is stored as a separate document in the database.
40. Which of the following is a characteristic of a map function in CouchDB?
A. It must return a boolean value
B. It must return a string value
C. It must return an array value
D. It must return a key-value pair
Answer: D.
Explanation – A map function in CouchDB must return a key-value pair.
41. Which of the following is a characteristic of a reduce function in CouchDB?
A. It must return a boolean value
B. It must return a string value
C. It must return an array value
D. It must return a single value
Answer: D.
Explanation – A reduce function in CouchDB must return a single value.
42. Which of the following is a valid syntax for a map function in CouchDB?
A. function(doc) { emit(doc._id, doc.name); }
B. function(map) { emit(map._id, map.name); }
C. function(view) { emit(view._id, view.name); }
D. function(data) { emit(data._id, data.name); }
Answer: A.
Explanation – The valid syntax for a map function in CouchDB is: function(doc) { emit(doc._id, doc.name); }
43. Which of the following is a valid syntax for a reduce function in CouchDB?
A. function(keys, values) { return values.length; }
B. function(key, values) { return values.length; }
C. function(keys, value) { return value.length; }
D. function(key, value) { return value.length; }
Answer: B.
Explanation – The valid syntax for a reduce function in CouchDB is: function(key, values) { return values.length; }
44. Which of the following is a valid syntax for a view index in CouchDB?
A. function(doc) { emit(doc._id, doc.name); }
B. function(map) { emit(map._id, map.name); }
C. function(view) { emit(view._id, view.name); }
D. function(data) { emit(data._id, data.name); }
Answer: A.
Explanation – The valid syntax for a view index in CouchDB is: function(doc) { emit(doc._id, doc.name); }
45. Which of the following is a characteristic of CouchDB’s built-in user authentication system?
A. It requires users to have a specific email domain
B. It stores user passwords in plain text
C. It supports multiple authentication mechanisms
D. It allows users to reset their own passwords
Answer: C.
Explanation – CouchDB’s built-in user authentication system supports multiple authentication mechanisms.
46. Which of the following is a valid authentication mechanism supported by CouchDB?
A. OAuth2
B. Basic Authentication
C. JWT
D. SAML
Answer: B.
Explanation – Basic Authentication is a valid authentication mechanism supported by CouchDB.
47. Which HTTP status code is returned when a user successfully authenticates with CouchDB?
A. 200
B. 201
C. 204
D. 401
Answer: A.
Explanation – The HTTP status code returned when a user successfully authenticates with CouchDB is 200.
48. Which of the following is a characteristic of a CouchDB database compaction?
A. It removes all documents from the database
B. It reduces the size of the database
C. It creates a backup of the database
D. It increases the number of views in the database
Answer: B.
Explanation – A CouchDB database compaction reduces the size of the database.
49. Which HTTP method is used to initiate a database compaction in CouchDB?
A. POST
B. GET
C. PUT
D. DELETE
Answer: A
Explanation – The HTTP method used to initiate a database compaction in CouchDB is POST.
50. Which of the following is a valid syntax for initiating a database compaction in CouchDB using cURL?
A. curl -X POST http://localhost:5984/mydatabase/_compact
B. curl -X PUT http://localhost:5984/mydatabase/_compact
C. curl -X GET http://localhost:5984/mydatabase/_compact
D. curl -X DELETE http://localhost:5984/mydatabase/_compact
Answer: A.
Explanation – The valid syntax for initiating a database compaction in CouchDB using cURL is: curl -X POST http://localhost:5984/mydatabase/_compact.
By testing your knowledge with these CouchDB MCQs With Answers that we have provided on our Freshersnow portal, you can gain a deeper understanding of CouchDB and its capabilities. Whether you are a beginner or an experienced developer, these CouchDB Questions will challenge your understanding and provide valuable insights into the features and functionality of CouchDB.