MongoDB is a popular NoSQL database system renowned for its flexibility and scalability. It uses a document-oriented model, storing data in JSON-like BSON format, allowing for dynamic schemas and easy data manipulation. MongoDB's distributed architecture supports horizontal scaling, ensuring high availability and performance. It's widely utilized for applications requiring real-time data access and complex data structures. Its features include automatic sharding, replication, and support for geospatial data, making it a versatile choice for a broad range of industries, from e-commerce and social media to IoT and big data analytics.
Show All Answers
Practice Test
41. What is the primary purpose of indexes in MongoDB?
A. To organize data physically
B. To store data collections
C. To create multiple databases
D. To query for documents
Show Answer
Report This Question
Answer: To query for documents
42. Which MongoDB index type allows for fast retrieval of documents based on a single field?
A. Compound Index
B. Single-field Index
C. Multi-key Index
D. Text Index
Show Answer
Report This Question
Answer: Single-field Index
43. What is a compound index in MongoDB?
A. An index with multiple fields
B. An index created by the system
C. An index that stores compound values
D. An index that combines different collections
Show Answer
Report This Question
Answer: An index with multiple fields
44. Which MongoDB index type is used for searching text within string fields?
A. Compound Index
B. Single-field Index
C. Multi-key Index
D. Text Index
Show Answer
Report This Question
Answer: Text Index
45. What is a unique index in MongoDB?
A. An index with a single field
B. An index with compound fields
C. An index with unique values
D. An index with duplicate values
Show Answer
Report This Question
Answer: An index with unique values
46. What does the term "sparse index" mean in MongoDB?
A. An index with missing values
B. An index with duplicate values
C. An index that covers all documents
D. An index for string fields
Show Answer
Report This Question
Answer: An index with missing values
47. How can you create a compound index in MongoDB using the MongoDB shell?
A. db.collection.createIndex({field1: 1, field2: 1})
B. db.collection.index({field1, field2})
C. db.collection.compoundIndex({field1, field2})
D. db.collection.addIndex({field1, field2})
Show Answer
Report This Question
Answer: db.collection.createIndex({field1: 1, field2: 1})
48. In MongoDB, which option specifies the sort order of the index key values?
A. sort
B. direction
C. order
D. keys
Show Answer
Report This Question
Answer: order
49. What happens if you drop an index in MongoDB?
A. The data is deleted
B. The collection is dropped
C. The index is removed
D. The index is disabled
Show Answer
Report This Question
Answer: The index is removed
50. What is the default index type in MongoDB for the _id field?
A. Compound Index
B. Text Index
C. Single-field Index
D. Unique Index
Show Answer
Report This Question
Answer: Single-field Index
