MongoDB Error Handling and Troubleshooting Quiz

This quiz will test your understanding of common MongoDB errors, troubleshooting practices, and essential commands for resolving issues in MongoDB environments. Get ready to explore topics like diagnosing connection issues, managing query performance, handling replication errors, and more. Good luck!

1 / 20

Using sharding in MongoDB can reduce the likelihood of encountering locking issues. True or False?

True

False

2 / 20

When troubleshooting connectivity issues, which command verifies if a MongoDB instance is reachable over the network?

db.ping()

db.runCommand({ ping: 1 })

mongo --ping

mongod.ping()

3 / 20

Which command will help identify if there are any replication delays in a MongoDB replica set?

db.getReplicationStatus()

db.replicaStatus()

db.checkReplication()

rs.status()

4 / 20

If the oplog in a MongoDB replica set becomes too full, it can cause a rollback during replication. True or False?

True

False

5 / 20

To find all documents that failed to insert due to validation errors, which MongoDB feature can be helpful?

errorLog collection

Aggregation Pipeline

writeConcern setting

Error handling middleware

6 / 20

Which option is essential to set in a write operation to capture errors resulting from insufficient replica acknowledgments?

writeConcern

readConcern

timeout

projection

7 / 20

What should you verify if you encounter a "connection refused" error when trying to connect to MongoDB?

Aggregation settings

Storage engine

Indexes

Firewall settings

8 / 20

What is a potential cause of “disk I/O” errors in MongoDB?

Connection pool limit exceeded

Insufficient RAM

Disk space shortage or hardware failure

Query timeout

9 / 20

The validate() command in MongoDB can be used to check for data corruption within a collection. True or False?

True

False

10 / 20

If MongoDB runs out of storage, it will automatically delete old data to free up space. True or False?

True

False

11 / 20

If MongoDB operations are taking too long, which action might improve performance?

Increasing replication factor

Increasing number of fields in each document

Reducing index count

Lowering write concern

12 / 20

What is the default port MongoDB uses, which you should check if experiencing connection issues?

28017

8080

3306

27017

13 / 20

Using too many indexes can slow down write operations in MongoDB. True or False?

True

False

14 / 20

Which MongoDB command is used to manually clear a collection-level lock if it causes a database operation to hang?

db.unlockCollection()

db.collection.unlock()

db.killOp()

db.adminCommand({ unlock: 1 })

15 / 20

Which command can be used to view recent warnings and errors in MongoDB?

db.showLogs()

db.getWarnings()

db.adminCommand({ getLog: "global" })

db.getErrorLog()

16 / 20

When facing latency in a MongoDB replica set, what setting can help minimize data delay between the primary and secondaries?

Optimize replication oplog window

Enable compression

Reduce writeConcern

Increase batchSize

17 / 20

Which of the following commands is useful for analyzing slow MongoDB queries?

db.currentOp()

db.systemLog()

db.queryLog()

db.slowOps()

18 / 20

Which command would you use to check the status of MongoDB to ensure it is running correctly?

db.serverStatus()

mongod --status

db.start()

mongo status

19 / 20

Which method can help reduce memory usage issues when handling large datasets in MongoDB?

Running all queries with skip()

Using $lookup in all queries

Indexing frequently accessed fields

Enabling auto-sharding

20 / 20

MongoDB automatically retries failed write operations due to transient network issues if retryable writes are enabled. True or False?

True

False

Your score is

The average score is 0%

The MongoDB Error Handling and Troubleshooting Quiz is vital for database administrators, developers, and system operators responsible for maintaining MongoDB databases in production.

This quiz is designed for intermediate to advanced MongoDB users looking to test their understanding of MongoDB, troubleshooting issues, and error-handling techniques.

Best of luck!