EXEC to execute in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a Redis transaction.

Redis

redis.call('[1]')

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

AEXEC

BMULTI

CWATCH

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC to start the transaction instead of MULTI.

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 in the current Redis transaction.

Redis

redis.call('[1]')

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

AMULTI

BDISCARD

CEXEC

DWATCH

Attempts:

3 left

💡 Hint

Common Mistakes

Using MULTI instead of EXEC to execute commands.

Using DISCARD which cancels the transaction.

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

3fill in blank

hard

Fix the error in the code to properly execute a Redis transaction.

Redis

redis.call('MULTI')
redis.call('SET', 'key', 'value')
redis.call('[1]')

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

AEXEC

BDISCARD

CWATCH

DMULTI

Attempts:

3 left

💡 Hint

Common Mistakes

Calling MULTI again instead of EXEC.

Using DISCARD which cancels the transaction.

After queuing commands with MULTI, use EXEC to execute them.

4fill in blank

hard

Fill both blanks to start a transaction and then cancel it.

Redis

redis.call('[1]')
redis.call('[2]')

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

AMULTI

BEXEC

CDISCARD

DWATCH

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC instead of DISCARD to cancel.

Using WATCH which does not cancel transactions.

Use MULTI to start and DISCARD to cancel the transaction.

5fill in blank

hard

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

Redis

redis.call('[1]', 'mykey')
redis.call('[2]')
redis.call('[3]')

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

AMULTI

BEXEC

CWATCH

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using DISCARD instead of EXEC to run the transaction.

Starting transaction before watching keys.

Use WATCH to monitor a key, MULTI to start the transaction, and EXEC to execute it.