5. Indexing and Query Optimization for Performance 🚀
Efficient querying is vital for scalable applications. MongoDB supports various index types, including single-field, compound, multi-key, text, and geospatial indexes.
Creating Indexes:
// Single-field index
db.users.createIndex({ name: 1 }) // ascending
// Compound index
db.users.createIndex({ name: 1, age: -1 }) // descending
Query Optimization:
- Use projections to return only necessary fields
- Analyze query plans with
explain()
:
db.users.find({ age: { $gt: 20 } }).explain()
- Regularly review index usage and remove unused indexes to optimize performance.
Proper indexing reduces query response times significantly, especially with large datasets, and is crucial for maintaining application responsiveness.