Why transactions ensure atomicity in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a Redis transaction.

Redis

redis_client.[1]()

Drag options to blanks, or click blank then click option'

AMULTI

BEXEC

CWATCH

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC to start a transaction instead of MULTI.

Using WATCH which is for monitoring keys, not starting transactions.

The MULTI command starts a transaction block in Redis, ensuring atomicity.

2fill in blank

medium

Complete the code to execute all commands in the Redis transaction atomically.

Redis

redis_client.[1]()

Drag options to blanks, or click blank then click option'

AMULTI

BWATCH

CEXEC

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using MULTI to execute commands instead of starting the transaction.

Using DISCARD which cancels the transaction.

The EXEC command executes all queued commands in the transaction atomically.

3fill in blank

hard

Fix the error in the code to discard a Redis transaction.

Redis

redis_client.[1]()

Drag options to blanks, or click blank then click option'

AEXEC

BDISCARD

CMULTI

DWATCH

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC which runs the transaction instead of discarding it.

Using MULTI which starts a transaction, not discards it.

The DISCARD command cancels the transaction, discarding all queued commands.

4fill in blank

hard

Fill both blanks to watch a key and then start a transaction in Redis.

Redis

redis_client.[1]('mykey')
redis_client.[2]()

Drag options to blanks, or click blank then click option'

AWATCH

BMULTI

CEXEC

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC before MULTI.

Using DISCARD instead of MULTI to start the transaction.

WATCH monitors the key for changes, and MULTI starts the transaction.

5fill in blank

hard

Fill all three blanks to watch a key, start a transaction, and execute it in Redis.

Redis

redis_client.[1]('session')
redis_client.[2]()
redis_client.[3]()

Drag options to blanks, or click blank then click option'

AWATCH

BMULTI

CEXEC

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Executing before starting the transaction.

Discarding instead of executing the transaction.

First, WATCH the key, then MULTI starts the transaction, and EXEC executes it atomically.