MongoDB Replication Management Quiz

1. What happens to write operations if the PRIMARY node fails and no secondary is elected?

Writes are queued and executed after recovery

Writes fail and return an error

Writes are automatically redirected to a secondary

Writes are replicated to the arbiter

2. In replica set replication, the ____ is the member receiving and applying data from the PRIMARY.

Replicator

Secondary

Consumer

Follower

3. Which command removes a member from a replica set?

Rs.remove()

Rs.delete()

Rs.removeMember()

Db.removeMember()

4. True or False: Write concern 'majority' ensures data is written to the PRIMARY and at least one secondary before acknowledging.

True

False

5. What is the purpose of the HIDDEN member type in MongoDB?

To store encrypted data only

To participate in replication but not be selected for read operations

To reduce network bandwidth usage

To serve as a backup arbiter

6. True or False: A secondary member with priority 0 can be elected as PRIMARY.

True

False

7. Which parameter in the replica set configuration controls the priority for election?

Weight

Priority

Rank

Eligibility

8. What does INITIAL SYNC do for a new replica set member?

Copies the entire dataset from the PRIMARY to the new member

Initializes only the oplog without data

Performs a full backup of the PRIMARY

Configures network settings only

9. In a replica set with 5 members, what is the minimum number needed to form a quorum for elections?

2 members

3 members

4 members

5 members

10. Which MongoDB command displays the current replica set status and member health?

Rs.status()

Rs.health()

Replica.info()

Db.replicaStatus()

11. What is the primary purpose of a replica set in MongoDB?

To distribute read queries across multiple servers

To provide high availability and automatic failover

To increase storage capacity horizontally

To encrypt data at rest

12. How do you add a new member to an existing replica set?

Rs.add() with the new member's hostname and port

Replica.addMember() function

Manual configuration file editing

Creating a new replica set entirely

13. What is the default election timeout for a MongoDB replica set?

5 seconds

10 seconds

30 seconds

60 seconds

14. Which read preference mode routes queries only to secondary nodes?

Primary

PrimaryPreferred

Secondary

Nearest

15. In replica set replication, what term describes the delay between the PRIMARY writing data and a SECONDARY applying it?

Replication lag

Network latency

Sync delay

Election timeout

16. What is the oplog in MongoDB?

A log of all database schema changes

A capped collection storing operations applied to the database

A file tracking user authentication events

A network protocol for replica communication

17. Which command initiates the replica set configuration in MongoDB?

Rs.init()

Replica.start()

Config.replica()

Initiate.set()

18. What is an ARBITER in a MongoDB replica set?

A node that stores data and participates in elections

A lightweight node that votes in elections but does not store data

A node that handles all read operations

A node that manages sharding configuration

19. How many members are required for a replica set to achieve automatic failover?

Two members

Three or more members

Five members

One member with arbiter

20. In a MongoDB replica set, what role does the PRIMARY node perform?

It handles read-only queries exclusively

It accepts all write operations and replicates changes to secondaries

It maintains backup snapshots only

It manages network communication between shards

MongoDB DBA Replication Management Quiz