TTL-based expiry in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a key with a TTL of 60 seconds.

Redis

SET mykey "value" EX [1]

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

A60

B600

C6

D3600

Attempts:

3 left

💡 Hint

Common Mistakes

Using milliseconds instead of seconds.

Forgetting to add the EX option.

The EX option sets the TTL in seconds. Here, 60 means the key expires after 60 seconds.

2fill in blank

medium

Complete the command to check the remaining TTL of a key.

Redis

TTL [1]

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

Atimeout

Bvalue

Cexpire

Dmykey

Attempts:

3 left

💡 Hint

Common Mistakes

Using the value instead of the key name.

Using a wrong keyword instead of the key.

The TTL command returns the remaining time to live of the specified key. You must provide the key name.

3fill in blank

hard

Fix the error in the command to remove the TTL from a key.

Redis

PERSIST [1]

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

Aexpire

Bmykey

Cvalue

Dtimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Using the value instead of the key name.

Using commands like EXPIRE instead of PERSIST.

The PERSIST command removes the TTL from the specified key, making it persistent. The key name must be provided.

4fill in blank

hard

Fill both blanks to set a key with a TTL of 120 seconds and then check its TTL.

Redis

SET [1] "data" EX [2]
TTL [3]

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

Asession

B120

Cuser

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Using different key names in SET and TTL commands.

Setting the wrong TTL value.

First, we set the key session with a TTL of 120 seconds. Then, we check the TTL of the same key.

5fill in blank

hard

Fill all three blanks to set a key with TTL, check TTL, and then remove TTL.

Redis

SET [1] "temp" EX [2]
TTL [1]
PERSIST [3]

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

Acache

B30

Dtemp

Attempts:

3 left

💡 Hint

Common Mistakes

Using different key names in commands.

Confusing the key name with the value.

We set the key cache with a TTL of 30 seconds, check its TTL, then remove the TTL to make it persistent.