Session and transaction syntax in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a client session in MongoDB.

MongoDB

const session = client.[1]();

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AcreateSession

BbeginSession

CopenSession

DstartSession

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'beginSession' instead of 'startSession'.

Trying to call 'openSession' which does not exist.

In MongoDB, startSession() is the correct method to begin a client session.

2fill in blank

medium

Complete the code to start a transaction inside a session.

MongoDB

session.[1]();

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AopenTransaction

BbeginTransaction

CstartTransaction

DinitTransaction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'beginTransaction' which is not a valid method.

Trying 'openTransaction' which does not exist.

The correct method to start a transaction in a session is startTransaction().

3fill in blank

hard

Fix the error in the code to commit a transaction.

MongoDB

await session.[1]();

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AendTransaction

BcommitTransaction

Ccommit

DfinalizeTransaction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'commit' which is not a method on session.

Trying 'endTransaction' which does not exist.

The correct method to commit a transaction is commitTransaction().

4fill in blank

hard

Fill both blanks to abort a transaction and end the session.

MongoDB

await session.[1]();
session.[2]();

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AabortTransaction

BendSession

CcloseSession

DrollbackTransaction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'rollbackTransaction' which is not a MongoDB method.

Using 'closeSession' instead of 'endSession'.

To abort a transaction, use abortTransaction(). To end the session, use endSession().

5fill in blank

hard

Fill all three blanks to run a transaction with a callback function.

MongoDB

await session.withTransaction(async () => {
  await collection.[1](doc, { session: [2] });
}, { readPreference: [3] });

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AinsertOne

Bsession

C'primary'

DupdateOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'updateOne' instead of 'insertOne' for adding a document.

Passing something other than 'session' as the session option.

Using a wrong read preference like 'secondary'.

Inside the transaction callback, use insertOne to add a document. Pass the session object to the operation. Set readPreference to 'primary' for strong consistency.