Benefits:

✅ Easy database interaction

✅ Supports SQL databases

🧠 146. What is Mongoose?

Mongoose is an ODM library for MongoDB.

Example:

const User = mongoose.model("User", userSchema);

🧠 147. What are ACID Properties?

ACID ensures reliable database transactions.

Properties:

• Atomicity

• Consistency

• Isolation

• Durability

Benefits:

✅ Data reliability

✅ Transaction safety

🧠 148. What is Transaction?

Transaction is a group of database operations executed together.

Example:

BEGIN;

UPDATE accounts

SET balance = balance - 500

WHERE id = 1;

COMMIT;

🧠 149. What is Database Sharding?

Sharding splits database into smaller parts.

Benefits:

✅ Better scalability

✅ Faster performance

🧠 150. What is Replication?

Replication copies database data across multiple servers.

Benefits:

✅ High availability

✅ Backup support

✅ Fault tolerance

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