Eviction policies overview in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the Redis eviction policy to remove the least recently used keys.

Redis

CONFIG SET maxmemory-policy [1]

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

Aallkeys-lru

Bnoeviction

Callkeys-random

Dvolatile-ttl

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'noeviction' which disables eviction.

Choosing 'volatile-ttl' which only evicts keys with expiration.

The allkeys-lru policy evicts the least recently used keys when memory limit is reached.

2fill in blank

medium

Complete the code to set Redis to evict only keys with an expiration time using a random eviction policy.

Redis

CONFIG SET maxmemory-policy [1]

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

Aallkeys-lfu

Ballkeys-random

Cvolatile-random

Dvolatile-lru

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'allkeys-random' which evicts any key randomly.

Choosing 'volatile-lru' which evicts least recently used keys with expiration.

The volatile-random policy evicts random keys but only those with an expiration set.

3fill in blank

hard

Fix the error in the command to set Redis eviction policy to remove the least frequently used keys among all keys.

Redis

CONFIG SET maxmemory-policy [1]

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

Aallkeys-lfu

Ballkeys-lru

Cvolatile-lfu

Dnoeviction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'volatile-lfu' which only evicts keys with expiration.

Using 'noeviction' which disables eviction.

The allkeys-lfu policy evicts the least frequently used keys regardless of expiration.

4fill in blank

hard

Fill both blanks to set Redis to evict keys randomly but only those with expiration time.

Redis

CONFIG SET maxmemory-policy [1]
CONFIG SET maxmemory [2]

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

Avolatile-random

Ballkeys-lru

C100mb

Dnoeviction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'noeviction' as policy which disables eviction.

Setting maxmemory to a non-size value.

Setting volatile-random evicts random keys with expiration, and setting maxmemory to 100mb limits memory usage.

5fill in blank

hard

Fill all three blanks to configure Redis to evict the least recently used keys among all keys and set maxmemory to 50mb.

Redis

CONFIG SET maxmemory-policy [1]
CONFIG SET maxmemory [2]
CONFIG SET [3] 5

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

Aallkeys-lru

B50mb

Cmaxmemory-samples

Dnoeviction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'noeviction' disables eviction.

Forgetting to set maxmemory or setting it incorrectly.

allkeys-lru evicts least recently used keys, 50mb sets the memory limit, and maxmemory-samples controls how many keys Redis samples to decide eviction candidates.