Memory-efficient data structures in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a memory-efficient Redis string key with a small value.

Redis

SET mykey [1]

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

A""

B"this is a very long string value that uses a lot of memory"

C1000000

D"small"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a very long string wastes memory.

Using an empty string might not be useful.

Using a small string value helps Redis store it efficiently in memory.

2fill in blank

medium

Complete the code to add multiple small elements efficiently to a Redis list.

Redis

LPUSH mylist [1]

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

A"element1"

B"a very long element that wastes memory"

C1000000

D""

Attempts:

3 left

💡 Hint

Common Mistakes

Adding large elements increases memory usage.

Adding empty strings might not be useful.

Adding small elements keeps the list memory-efficient.

3fill in blank

hard

Fix the error in the command to create a memory-efficient Redis hash with small fields.

Redis

HSET myhash field1 [1]

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

A"this is a very long value that wastes memory"

B""

C"smallvalue"

D1000000

Attempts:

3 left

💡 Hint

Common Mistakes

Using large values increases memory usage.

Using empty strings might not be useful.

Using small field values helps Redis store hashes efficiently using ziplists.

4fill in blank

hard

Fill both blanks to create a memory-efficient Redis sorted set with small scores and members.

Redis

ZADD myzset [1] [2]

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

A1

B"member1"

C1000000

D"averylongmembername"

Attempts:

3 left

💡 Hint

Common Mistakes

Using large scores or long member names wastes memory.

Using small numeric scores and short member names keeps sorted sets memory-efficient.

5fill in blank

hard

Fill all three blanks to create a memory-efficient Redis set with small members and add a new member.

Redis

SADD myset [1] [2] [3]

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

A"a"

B"b"

C"c"

D"averylongmembername"

Attempts:

3 left

💡 Hint

Common Mistakes

Adding long member names wastes memory.

Using short member names keeps Redis sets memory-efficient.