Why key management matters in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a key named 'user:1' with value 'Alice' in Redis.

Redis

SET [1] Alice

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

Auser_1

Buser:1

Cuser

Duser1

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys without namespaces can cause confusion and collisions.

The key 'user:1' uses a colon to separate namespaces, which is a common practice in Redis key management.

2fill in blank

medium

Complete the code to retrieve the value of the key 'session:1234' from Redis.

Redis

GET [1]

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

Asession1234

Bsession_1234

Csession-1234

Dsession:1234

Attempts:

3 left

💡 Hint

Common Mistakes

Using underscores or dashes instead of colons can break key patterns.

The key 'session:1234' uses a colon to separate the type and the ID, which helps in managing keys effectively.

3fill in blank

hard

Fix the error in the code to delete the key 'cache:data' from Redis.

Redis

DEL [1]

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

Acache_data

Bcache-data

Ccache:data

Dcachedata

Attempts:

3 left

💡 Hint

Common Mistakes

Using underscores or dashes instead of colons causes the command to fail.

The key must match exactly, including the colon, to delete the correct key in Redis.

4fill in blank

hard

Fill both blanks to set a key with a namespace and an expiration time of 3600 seconds.

Redis

SET [1] 'value' EX [2]

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

Auser:1001

B3600

C300

Duser1001

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys without namespaces or wrong expiration times.

Using 'user:1001' as the key with an expiration time of 3600 seconds (1 hour) helps manage keys efficiently.

5fill in blank

hard

Fill all three blanks to increment a numeric key 'counter:visits' by 1 and retrieve its new value.

Redis

INCR [1]
GET [2]
DEL [3]

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

Acounter:visits

Dcounter_visits

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing key names with underscores or missing colons.

Using the exact key 'counter:visits' ensures the increment, retrieval, and deletion commands work on the same key.