Question:- How does Journaling work in MongoDB?
Answer:- Write operations are saved in memory while journaling is going on. The on-disk journal files are really dependable for the reason that the journal writes are habitual. Inside dbPath, a journal subdirectory is designed by MongoDB.
Question:- How can you isolate the cursors from intervening with the write operations?
Answer:- The snapshot() method is used to isolate the cursors from intervening with writes. This method negotiates the index and makes sure that each query comes to any article only once.
Question:- Define MongoDB.
Answer:- It is a document-oriented database that is used for high availability, easy scalability, and high performance. It supports the dynamic schema design.
Question:- Explain the replica set.
Answer:- It is a group of mongo instances that maintains the same dataset. Replica sets provide redundancy and high availability and are the basis for all production deployments.
Question:- What are the key features of MongoDB?
Answer:- There are three main features of MongoDB: • Automatic scaling • High performance • High availability
Question:- What is CRUD?
Answer:- MongoDB provides CRUD operations: Create Read Update Delete
Question:- What is Sharding?
Answer:- In MongoDB, sharding means to store data on multiple machines.
Question:- What is Aggregation in MongoDB?
Answer:- In MongoDB, aggregations are operations that process data records and return computed results.
Question:- Define Namespace in MongoDB.
Answer:- It is the concatenation of the collection name and the name of the database.
Question:- Which syntax is used to create a Collection in MongoDB?
Answer:- We can create a collection in MongoDB using the following syntax: db.createCollection(name,options)
Question:- Which syntax is used to drop a Collection in MongoDB?
Answer:- We can use the following syntax to drop a collection in MongoDB: db.collection.drop()
Question:- Explain Replication.
Answer:- Replication is the process of synchronizing data across multiple servers.
Question:- What is the use of an Index in MongoDB?
Answer:- In MongoDB, indexes provide high-performance read operations for frequently used queries.
Question:- Which command is used for inserting a document in MongoDB?
Answer:- The following command is used for inserting a document in MongoDB: database.collection.insert (document)