Database / MongoDB Interview questions

How does the MongoDB pushes the writes to disk?

MongoDB pushes the data to disk lazily. It updates the immediately to the journal but writing the data from journal to disk happens lazily.

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What is MongoDB? What is NoSQL database? Types of NoSQL Database. List some of the important features of mongoDB. Give few examples of NoSQL database. What are the core components of MongoDB package? What is Namespace in MongoDB? Difference between SQL and No-SQL terminologies. What is sharding in MongoDB? Does MongoDB support primary-key, foreign-key relationship? How do I achieve primary key - foreign key relationships in MongoDB? How replication works in MongoDB? Why is MongoDB not recommended for a 32-bit system? Does MongoDB support ACID transaction management and locking functionalities? Define replica set in mongoDB. Syntax used to create collection in mongodb. What is journaling in mongoDB? Define primary replica sets in mongoDB. What is the use of profiler in mongoDB? Define secondary replica sets in mongoDB. Define vertical and horizontal scaling. How does the MongoDB pushes the writes to disk? What is the structure of ObjectID in MongoDB? What is the role of GridFS in mongodb? Command used to create the backup of database in mongoDB. Command used to restore the backup in mongoDB. What is the mongo shell command to show the database (db) that you are currently using? What does <mongo_db_collection>.watch() command do? What is 2dsphere index in MongoDB? Compare various No SQL Databases. Cassandra vs MongoDB - What are the Differences?

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Database / MongoDB Interview questions

How does the MongoDB pushes the writes to disk?

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