1. Main benefit of NoSQL databases

❌ Better for small-scale data
❌ More complex for application development
❌ More specialized
✅ They can handle large-scale data and concurrent users

Explanation:
NoSQL databases are designed for scalability, high throughput, and massive concurrency.

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2. What led to development of scalable tech in late ’90s & early 2000s?

❌ Data security improvements
✅ Need to serve millions of users on the public internet
❌ Faster processing on local networks
❌ Rise of cloud computing

Explanation:
The internet boom created a demand for horizontal scalability for huge user bases.

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3. How does MongoDB provide high availability?

❌ Only allows horizontal scaling
❌ Requires predefined schema
✅ Keeps multiple copies of your data (replication)
❌ Restricts stored data size

Explanation:
MongoDB uses replica sets to maintain redundant copies for availability.

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4. MongoDB advantage over relational databases

❌ Does not support sub-documents
❌ Requires predefined schema
❌ Supports only one type of data
✅ Flexible storage of structured & unstructured data

Explanation:
MongoDB stores JSON-like documents with schema flexibility.

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5. Benefit of MongoDB’s evolving schema

✅ Easily adapts to new data requirements
❌ Requires third-party frameworks
❌ Requires DB structure changes
❌ Limits data types

Explanation:
MongoDB’s schema flexibility supports rapid evolution of applications.

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6. Benefit of MongoDB’s querying & analytics

✅ Uses MongoDB Query Language (MQL) to build complex queries
❌ Requires complex SQL
❌ Limits query complexity
❌ Doesn’t support aggregation

Explanation:
MQL + Aggregation Pipeline enable powerful analytics directly in the database.

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7. Why is MongoDB good for real-time analytics?

❌ Requires complex ETL
❌ Cannot respond quickly
✅ Performs analysis where the data is stored
❌ Only handles structured data

Explanation:
Because computation happens close to data, results are available immediately.

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8. Benefit of MongoDB in finance industry

❌ Requires complex ETL
✅ Performs thousands of ops/sec and is highly reliable
❌ Cannot store IoT data
❌ No encryption

Explanation:
MongoDB is known for high throughput, replication, and security features.

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9. Purpose of the Mongo shell

✅ Interact with databases and perform data + admin operations
❌ Perform CRUD on MySQL
❌ Create docs/collections only
❌ Send emails

Explanation:
Mongo shell is a CLI for querying, managing, and administering MongoDB.

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10. Function to delete more than one document

❌ removeMany
❌ removeOne
✅ deleteMany
❌ deleteOne

Explanation:
deleteMany() removes all documents that match a filter.

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🧾 SUMMARY TABLE

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