Transaction execution model in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a Redis transaction.

Redis

redisClient.[1]()

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

AMULTI

BEXEC

CWATCH

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC instead of MULTI to start the transaction.

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

The MULTI command starts a transaction block in Redis.

2fill in blank

medium

Complete the code to execute all commands queued in the transaction.

Redis

redisClient.[1]()

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

AEXEC

BWATCH

CDISCARD

DMULTI

Attempts:

3 left

💡 Hint

Common Mistakes

Using MULTI instead of EXEC to run the transaction.

Using DISCARD which cancels the transaction.

The EXEC command executes all commands queued after MULTI.

3fill in blank

hard

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

Redis

redisClient.[1]()

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

AEXEC

BMULTI

CDISCARD

DWATCH

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC which executes the transaction instead of cancelling.

Using WATCH which is for monitoring keys, not cancelling.

The DISCARD command cancels all commands queued in the current transaction.

4fill in blank

hard

Fill both blanks to watch a key and start a transaction.

Redis

redisClient.[1]('user:1')
redisClient.[2]()

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

AWATCH

BEXEC

CMULTI

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC before MULTI.

Using DISCARD instead of MULTI to start 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.

Redis

redisClient.[1]('cart:123')
redisClient.[2]()
redisClient.[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.

Not watching the key before starting the transaction.

First WATCH the key, then MULTI to start the transaction, and finally EXEC to execute it.