MongoDB Security and Administration Flashcards

What is the purpose of MongoDB's field-level encryption (FLE)?

Answer: Encrypting specific sensitive fields within documents while leaving others readable

Field-level encryption (FLE) encrypts individual document fields client-side before storing, so even database administrators cannot read the sensitive plaintext values.

What does db.killOp() do in MongoDB?

Answer: Terminates a specific running operation by its operation ID

db.killOp(opId) terminates the specified in-progress operation, useful for stopping long-running queries or stuck operations.

What is the Profiler in MongoDB used for?

Answer: Capturing slow query information for performance analysis

MongoDB's database profiler collects detailed information about operations exceeding a specified threshold, storing results in the system.profile collection.

Which MongoDB command shows database storage statistics including size and index sizes?

Answer: db.stats()

db.stats() returns statistics including the database name, number of collections, total data size, storage size, and index sizes.

What is the purpose of the --oplogSize parameter when starting mongod?

Answer: Sets the maximum size of the oplog capped collection in megabytes

--oplogSize specifies the maximum size of the oplog in MB; a larger oplog allows secondaries more time to catch up before falling out of sync.

What does the mongotop tool monitor in MongoDB?

Answer: Time spent reading and writing data per collection

mongotop tracks how much time a MongoDB instance spends reading and writing data for each collection, reporting statistics at regular intervals.