countDocuments()
Reference group: Collection CRUD methods
What it does
Counts documents matching a filter.
Syntax
db.collection.countDocuments(filter)
Use case
Calculate exact filtered counts.
Important notes
Broad counts can be expensive.
countDocuments(): practical example
db.orders.countDocuments({ status: "open" })💡 Explanation
Counts documents matching a filter.
When to use it
Calculate exact filtered counts.
Caution
Broad counts can be expensive.
Key Takeaways
- Counts documents matching a filter.
- Typical use: Calculate exact filtered counts.