MONGODB Tutorial

📌 MongoDB createIndex()

The createIndex() method in MongoDB is used to create an index on a specified field or fields in a collection. Indexes enhance search performance and are essential for optimizing query operations.

✅ Basic Syntax

db.collection.createIndex({ field: 1 })
  

1 = Ascending Order, -1 = Descending Order

🔹 Example: Create Index on "username"

db.users.createIndex({ username: 1 })
  

🔹 Compound Index (Multiple Fields)

Useful when querying with multiple fields.

db.users.createIndex({ username: 1, age: -1 })
  

🔍 Unique Index

Prevents duplicate values in a field.

db.users.createIndex({ email: 1 }, { unique: true })
  

🧹 Dropping an Index

db.users.dropIndex({ username: 1 })