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.
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Practice Test
131. What is the primary purpose of taking backups in MongoDB?
A. Data modeling
B. Data storage
C. Data replication
D. Data recovery
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Answer: Data recovery
132. What is a common method for creating backups in MongoDB?
A. Copying the data directory
B. Using database triggers
C. Taking a snapshot of data
D. Exporting data to a text file
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Answer: Taking a snapshot of data
133. What is a "point-in-time" backup in MongoDB?
A. A backup of a single document
B. A backup of the entire database
C. A backup that captures data at a specific time
D. A backup of the system configuration
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Answer: A backup that captures data at a specific time
134. Which MongoDB tool is commonly used to perform database backups?
A. mongoexport
B. mongodump
C. mongoimport
D. mongorestore
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Answer: mongodump
135. What does the "oplog" in MongoDB help with during restoration?
A. Data recovery
B. Data replication
C. Data modeling
D. Query optimization
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Answer: Data replication
136. How can you restore a backup created with "mongodump" in MongoDB?
A. Use "mongorestore"
B. Manually copy files
C. Use "mongoimport"
D. Re-create the database
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Answer: Use "mongorestore"
137. What is a common approach to automate MongoDB backup processes?
A. Using "mongodump" utility
B. Manually running backups
C. Creating custom scripts
D. Backing up data files
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Answer: Creating custom scripts
138. Which "dump" format is the default output format of "mongodump"?
A. BSON
B. JSON
C. CSV
D. XML
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Answer: BSON
139. What is the purpose of a "cold backup" in MongoDB?
A. Backup taken while the system is running
B. Backup of a disconnected database
C. Backup taken during maintenance
D. Backup of a secondary replica set
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Answer: Backup taken while the system is running
140. How can you restore a database from a snapshot in MongoDB?
A. Manually copying snapshot files
B. Using the "snapshot-restore" command
C. Executing "mongoimport" on the snapshot data
D. Running "mongorestore" on the snapshot data
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Answer: Using the "snapshot-restore" command
