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

Which of the following is a common cause of "lock timeout" errors in MongoDB?

User authentication issues

Insufficient memory

Slow network speed

Long-running operations holding locks

2 / 20

If you encounter a “not master” error while performing a write operation, what is the most likely cause?

Memory allocation error

Incorrect index configuration

Attempting to write on a secondary node

Insufficient disk space

3 / 20

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

True

False

4 / 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

5 / 20

In a sharded MongoDB cluster, which error might occur if a query tries to target multiple shards inefficiently?

scatter-gather error

timeLimitExceeded

memoryQuotaExceeded

queryExecutionTimeout

6 / 20

If a MongoDB server crashes unexpectedly, which log file should you check for errors?

error.log

mongod.log

access.log

syslog

7 / 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()

8 / 20

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

True

False

9 / 20

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

True

False

10 / 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

11 / 20

Which method can be used to analyze and troubleshoot MongoDB query performance?

db.query()

check()

db.runCommand("analyze")

explain()

12 / 20

To terminate a long-running operation in MongoDB, which command would you use?

db.killOp(opid)

db.stop()

db.closeOp()

db.terminateOp()

13 / 20

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

db.showLogs()

db.getWarnings()

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

db.getErrorLog()

14 / 20

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

True

False

15 / 20

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

writeConcern

readConcern

timeout

projection

16 / 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

17 / 20

If a user encounters an “unauthorized” error while accessing a MongoDB database, what is the likely cause?

User lacks appropriate permissions

Network issues

Missing indexes

Database corruption

18 / 20

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

db.currentOp()

db.systemLog()

db.queryLog()

db.slowOps()

19 / 20

If a query repeatedly fails due to memory constraints, which MongoDB configuration might help?

Disabling all indexes

Increasing the cacheSize parameter

Reducing the batchSize parameter

Decreasing timeout values

20 / 20

A "duplicate key" error in MongoDB typically occurs due to duplicate _id values in the same collection. 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!