Understanding MongoDB Transactions: Intermediate-Level Quiz

Understanding MongoDB Transactions

This quiz focuses on MongoDB's transaction capabilities, exploring how transactions ensure ACID compliance, manage multi-document operations and handle consistency in replica sets and sharded clusters. Test your understanding of starting, committing, and aborting transactions, along with their key features and limitations. Good luck!

1 / 20

Which of the following is required to use transactions in MongoDB?

All collections involved must be indexed

A session must be created and a transaction started

All reads must use readConcern level snapshot

The writeConcern must be set to w: majority

2 / 20

What is the role of the writeConcern option in MongoDB transactions?

To ensure the durability of writes in the transaction

To control the transaction’s isolation level

To define the transaction timeout

To manage read operations in a transaction

3 / 20

What happens if the primary node in a replica set fails during a transaction?

The transaction is aborted and will need to be retried once a new primary is elected

The transaction is automatically committed

The transaction is paused until the primary node recovers

The transaction continues on the secondary node

4 / 20

In MongoDB, what does the readConcern option control within a transaction?

The write durability

The consistency of write operations

Transaction timeout

The level of isolation for read operations

5 / 20

Which of the following is true regarding write operations in a MongoDB transaction?

Write operations are applied only after the transaction is successfully committed

Write operations are rolled back automatically

Write operations are committed immediately

Write operations are partially committed

6 / 20

MongoDB transactions are only supported in replica sets. True or False?

True

False

7 / 20

Transactions in MongoDB are supported across sharded clusters starting from version 4.2. True or False?

True

False

8 / 20

Which MongoDB version introduced multi-document transactions?

3.4

3.6

4.0

4.2

9 / 20

A MongoDB transaction can span multiple collections in a single database. True or False?

True

False

10 / 20

In which of the following scenarios is a transaction in MongoDB most useful?

When performing bulk insert operations

When performing real-time data analytics

When multiple documents need to be updated atomically across different collections

When querying large datasets

11 / 20

Which isolation level does MongoDB transactions provide by default?

Read Committed

Read Uncommitted

Serializable

Snapshot Isolation

12 / 20

Which command is used to start a transaction in MongoDB?

session.runTransaction()

db.runCommand({startTransaction: 1})

db.startTransaction()

session.startTransaction()

13 / 20

Which of the following operations can be included in a MongoDB transaction?

Index creation

Database schema changes

Insert, update, and delete operations

Sharding operations

14 / 20

Transactions in MongoDB can operate across multiple databases within the same deployment. True or False?

True

False

15 / 20

All transactions in MongoDB must start with a startTransaction command and must end with either commitTransaction or abortTransaction. True or False?

True

False

16 / 20

Which command is used to abort a transaction in MongoDB?

db.abortTransaction()

db.endTransaction()

session.rollback()

session.abortTransaction()

17 / 20

How is a transaction committed in MongoDB?

db.runCommand({commitTransaction: 1})

session.runTransaction()

session.commitTransaction()

db.commitTransaction()

18 / 20

Which of the following statements is true about transactions in a MongoDB sharded cluster?

Transactions are not supported in sharded clusters

Transactions can span multiple shards starting from MongoDB 4.2

Sharded clusters require custom transactions

Transactions can only be performed on a single shard

19 / 20

What happens if a MongoDB transaction encounters an error?

The transaction is aborted and all changes are rolled back

The transaction continues until completion

The transaction is ignored

Only part of the transaction is rolled back

20 / 20

If a transaction fails to commit, you must manually abort it using session.abortTransaction(). True or False?

True

False

Your score is

The average score is 0%

Understanding MongoDB Transactions involves learning to manage multi-document operations with ACID (Atomicity, Consistency, Isolation, Durability) guarantees.

It covers starting, committing, and aborting transactions, handling concurrency, and best practices for ensuring data integrity in complex workflows.

This MongoDB Transaction quiz is ideal for professionals seeking to test their knowledge in ensuring data integrity in complex workflows.

All the best.