Questions
1 of 10
1What Are Transactions in MongoDB?
2What is core api and callback api?
3How does MongoDB achieve ACID compliance across multiple documents given its distributed nature?
4What is the difference between 'Snapshot Isolation' and 'Serializable' isolation levels in MongoDB?
5What are the major performance costs of using multi-document transactions compared to single-document atomic updates?
6Discuss the 60-second execution limit. What happens to the WiredTiger cache if a transaction stays open for too long?
7Explain 'Write Conflict' errors during a transaction. How should your Node.js application handle them?
8How do 'Read Concern' and 'Write Concern' settings affect a transaction's behavior?
9You are building a fintech ledger system. You need to move funds from User A to User B. How do you implement this, and why might you choose a 'Saga Pattern' over a MongoDB Transaction for this specific use case?
10Why is it dangerous to perform asynchronous non-database tasks (like sending an email or calling an API) inside a session.withTransaction() block?
MongoDBMongoDB
Basics
CRUD
Bulk Operations
Indexing
Data Modelling
Replication
Sharding
Transactions
Aggregation
01 / 10

What Are Transactions in MongoDB?

Transactions in MongoDB allow you to perform multiple operations across one or more documents (and collections) as a single, atomic unit. This means that all the operations in a transaction are either fully completed (committed) or fully undone (rolled back) if an error occurs.

Key Features of Transactions:
  1. 1

    Atomicity: Ensures that all operations within a transaction are applied as a single unit.

  2. 2

    Consistency: Maintains data consistency by ensuring that changes made during a transaction do not leave the database in an inconsistent state.

  3. 3

    Isolation: Guarantees that ongoing transactions do not interfere with each other