Q31: How do atomic update operators ($inc, $set, $push, $pull) work?
Update operators modify documents atomically directly on the database server without requiring client-side fetch-and-save loops:
$set: Sets value of a specified field.$inc: Increments field value by a specified number.$push/$pull: Appends or removes elements from array fields.
Key Takeaways
- Atomic operators prevent concurrency race conditions.
- Updates occur directly on database server nodes.
Knowledge Check
Which operator safely increments a counter field atomically without risking concurrent write race conditions?