Multi-key transactions for consistency in Redis - Interactive Code Practice

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'

ADISCARD

BEXEC

CWATCH

DMULTI

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 Redis transaction.

Redis

redis_client.[1]()

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

AWATCH

BEXEC

CMULTI

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 commands queued in the transaction.

3fill in blank

hard

Fix the error in the code to watch keys for changes before starting a transaction.

Redis

redis_client.[1]('key1', 'key2')
redis_client.MULTI()

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

AWATCH

BMULTI

CEXEC

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC or MULTI instead of WATCH to monitor keys.

Using DISCARD which cancels the transaction.

The WATCH command monitors keys for changes to ensure transaction consistency.

4fill in blank

hard

Fill both blanks to discard a transaction and unwatch keys.

Redis

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

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

ADISCARD

BEXEC

CUNWATCH

DMULTI

Attempts:

3 left

💡 Hint

Common Mistakes

Using EXEC instead of DISCARD to cancel.

Using MULTI instead of UNWATCH to stop watching.

DISCARD cancels the transaction, and UNWATCH stops watching keys.

5fill in blank

hard

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

Redis

redis_client.[1]('keyA', 'keyB')
redis_client.[2]()
redis_client.[3]()

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

AWATCH

BEXEC

CMULTI

DDISCARD

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of commands.

Using DISCARD instead of EXEC to run the transaction.

First, WATCH monitors keys, then MULTI starts the transaction, and finally EXEC executes it.