SET with expiry (EX, PX) in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a key with a 10-second expiry using the EX option.

Redis

SET mykey myvalue [1] 10

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

ANX

BEX

CPX

DXX

Attempts:

3 left

💡 Hint

Common Mistakes

Using PX instead of EX for seconds expiry.

Omitting the expiry option entirely.

The EX option sets the expiry time in seconds. Here, 10 means the key expires after 10 seconds.

2fill in blank

medium

Complete the code to set a key with a 5000-millisecond expiry using the PX option.

Redis

SET session_token abc123 [1] 5000

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

APX

BNX

CEX

DKEEPTTL

Attempts:

3 left

💡 Hint

Common Mistakes

Using EX instead of PX for millisecond expiry.

Forgetting to specify expiry option.

The PX option sets the expiry time in milliseconds. 5000 means the key expires after 5 seconds.

3fill in blank

hard

Fix the error in the command to set a key with a 20-second expiry using the correct expiry option.

Redis

SET user_id 42 [1] 20

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

APX

BXX

CEX

DNX

Attempts:

3 left

💡 Hint

Common Mistakes

Using PX instead of EX for seconds expiry.

Using NX or XX which control key existence, not expiry.

The EX option is correct for setting expiry in seconds. PX would interpret 20 as milliseconds, which is too short.

4fill in blank

hard

Fill both blanks to set a key with a 3000-millisecond expiry and only if the key does not exist.

Redis

SET cache_key data [1] 3000 [2]

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

APX

BEX

CNX

DXX

Attempts:

3 left

💡 Hint

Common Mistakes

Using EX instead of PX for milliseconds.

Using XX instead of NX for key existence condition.

PX sets expiry in milliseconds. NX ensures the key is set only if it does not exist.

5fill in blank

hard

Fill all three blanks to set a key with a 15-second expiry, only if the key exists, and keep the existing TTL if no expiry is given.

Redis

SET config_value 100 [1] 15 [2] [3]

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

AEX

BPX

CXX

DKEEPTTL

Attempts:

3 left

💡 Hint

Common Mistakes

Using NX instead of XX for key existence condition.

Using PX instead of EX for seconds expiry.

Omitting KEEPTTL when wanting to keep TTL.

EX sets expiry in seconds. XX means set only if key exists. KEEPTTL keeps the existing TTL if no new expiry is specified.