db.stats() — MongoDB Technical Interview Questions & Answers

Shows storage statistics for the current database.

db.stats()

  • Simple meaning: db.stats() prints size, collection count, and object count for the current database.
  • How to use: use college then db.stats(). Collection: db.students.stats().
  • Try this: insert 3 students, run db.stats(), look at objects.
  • Common mistake: treating it as a query of student rows — it is storage stats, not find().
  • Interview tip: “Health/size snapshot, not business data.”

Technical Interview Tip: stats() = storage numbers, find() = documents.

Code Examples for db.stats()

db.stats() — working example

db.stats()
db.users.stats()

db.stats() — stats() reports storage counts/sizes for a database or collection.

How to Explain db.stats() to an Interviewer

What is db.stats()?

Storage and count statistics for the current database