Amazon DynamoDB (Storage)

📅 Apr 15, 2026

AWS STORAGE — NOSQL DATABASE

🔖 Amazon DynamoDB

NoSQL | Serverless | Flexible Schema | Fully Managed

🧠 Core Idea

▸ Key-Value + Document database

▸ Schema-less (Flexible schema)

▸ Auto-scaling, high performance, fully managed

🚀 Features

▸ Serverless — server manage गर्नु पर्दैन

▸ Massive scale — millions TPS

▸ Pay-as-you-go

▸ Global Tables (multi-region)

📦 Data Model

▸ Table

▸ Item = row

▸ Attribute = column

▸ Primary Key: Partition Key

▸ Primary Key: Partition + Sort Key

❌ Not Suitable For

✗ Complex JOIN operations

✗ Heavy SQL queries

✗ Strict relational schema

✅ Best Use Cases

User profile • Session store • IoT data • Gaming leaderboard • Shopping cart

📝 EXAM MAGIC LINE

"Flexible schema + High scale = DynamoDB" 🎯

👁 Question मा: serverless, scalable, flexible schema, NoSQL देख्यौ भने → Answer = DynamoDB

Question	Answer
❓ MCQ Practice — Exam Style
Q1. कुन AWS service ले flexible schema support गर्छ? A. RDS B. Redshift C. Aurora D. DynamoDB	D ✔
Q2. DynamoDB कुन type को database हो? A. Relational B. Graph C. NoSQL D. Data Warehouse	C ✔
Q3. DynamoDB मा schema किन flexible हुन्छ? A. Fixed columns B. SQL based C. Each item can have different attributes D. Table redefine	C ✔
Q4. Millions of read/write per second चाहियो भने? A. RDS B. Aurora C. Redshift D. DynamoDB	D ✔
Q5. DynamoDB को primary key के मा based हुन्छ? A. Row number B. Index only C. Partition key / Sort key D. Foreign key	C ✔

UserID	Name	Phone	Address	Extra Attribute
📱 Real-Life Example — Nepali E-commerce App (Daraz जस्तै)
U101	Ram	98xxxx	Kathmandu	—
U102	Sita	97xxxx	Pokhara	LoyaltyPoints ← extra!
U103	Hari	—	Biratnagar	FacebookLogin ← extra!

👉 सबै user को column एउटै छैन → Relational DB मा problem हुन्थ्यो → DynamoDB मा perfectly OK ✅

🔚 FINAL EXAM TIP 💡

Question मा यी शब्द देख्यौ भने → Answer = DynamoDB 🎯

serverless scalable flexible schema NoSQL