MongoDB Atlas and Cloud Deployment Flashcards

What is the Atlas connection string format used by application drivers?

Answer: mongodb+srv://username:password@cluster.mongodb.net/dbname

Atlas uses the mongodb+srv:// connection string format, which uses DNS SRV records to automatically discover all cluster members, handle failover, and load balance connections. The +srv format is recommended over listing individual hostnames for Atlas deployments.

What is Atlas App Services (formerly Realm) used for?

Answer: Building mobile and web applications with backend services including authentication, data sync, and serverless functions

Atlas App Services (formerly MongoDB Realm) provides a backend-as-a-service (BaaS) platform including: user authentication (OAuth, email/password, API keys), Device Sync for offline-first mobile apps, serverless Functions, GraphQL API, and Triggers — all integrated with Atlas clusters.

What does Atlas Performance Advisor recommend?

Answer: Index creation suggestions based on slow query patterns detected in the cluster

Atlas Performance Advisor analyzes slow query logs and recommends new indexes to improve query performance. It identifies queries that would benefit most from additional indexes and generates the exact createIndex() commands, making index optimization accessible without manual query analysis.

What is the purpose of Atlas Database Users vs Atlas Organization Users?

Answer: Database Users authenticate to MongoDB clusters; Organization Users manage Atlas infrastructure via the web UI and API

Atlas distinguishes between Database Users (MongoDB credentials used by applications to connect and authenticate to clusters, defined with roles like readWrite or atlasAdmin) and Atlas Users (human users or API keys that manage Atlas infrastructure via the Atlas web UI, CLI, or API).

Which Atlas feature provides real-time performance metrics and allows you to kill long-running operations?

Answer: Real-Time Performance Panel

The Atlas Real-Time Performance Panel displays live metrics including operations per second, network throughput, connections, CPU usage, and a list of currently executing operations. DBAs can identify and terminate problematic long-running queries or slow operations directly from the panel.

What is Atlas Serverless in MongoDB Atlas?

Answer: An instance type that automatically scales compute resources and charges based on operations consumed rather than provisioned capacity

Atlas Serverless instances automatically scale compute and storage resources based on workload demand. Pricing is consumption-based (per Read Processing Unit, Write Processing Unit, and GB stored) rather than hourly provisioned capacity. Ideal for variable or unpredictable workloads with periods of inactivity.