Commit and abort behavior in MongoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does commit mean in MongoDB transactions?

Commit means to save all the changes made during a transaction permanently to the database.

beginner

What happens when you abort a transaction in MongoDB?

Aborting a transaction cancels all changes made during the transaction, so the database stays as it was before the transaction started.

intermediate

Why use transactions with commit and abort in MongoDB?

Transactions ensure that multiple related changes happen all together or not at all, keeping data correct and safe.

beginner

How do you start a transaction in MongoDB?

You start a transaction by calling session.startTransaction() on a client session.

beginner

What is the role of session.commitTransaction() and session.abortTransaction()?

session.commitTransaction() saves changes permanently, while session.abortTransaction() cancels all changes made in the transaction.

What does commitTransaction() do in MongoDB?

A Starts a new transaction

B Cancels all changes made in the transaction

C Saves all changes made in the transaction permanently

D Deletes the database

commitTransaction() saves all changes made during the transaction permanently to the database.

If you want to cancel all changes in a MongoDB transaction, which method do you use?

A commitTransaction()

B abortTransaction()

C startTransaction()

D endTransaction()

abortTransaction() cancels all changes made during the transaction.

When does a MongoDB transaction become permanent?

A When you start the transaction

B When you abort the transaction

C When you close the database

D When you commit the transaction

Changes become permanent only after commitTransaction() is called.

Which of these is true about MongoDB transactions?

A They allow multiple operations to be treated as one unit

B They automatically save changes without commit

C They cannot be aborted once started

D They delete all data on abort

Transactions group multiple operations so they succeed or fail together.

What is the first step to use transactions in MongoDB?

A Start a client session and call startTransaction()

B Call commitTransaction()

C Call abortTransaction()

D Close the database connection

You must start a client session and call startTransaction() to begin a transaction.

Explain in your own words what happens when you commit and abort a transaction in MongoDB.

Think about saving or canceling a group of changes together.

Describe the steps to perform a transaction in MongoDB including commit and abort.

Imagine you are making a group of changes and deciding to save or cancel them.