Redis as cache vs data store vs message broker - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a key with an expiration time in Redis.

Redis

SET mykey myvalue EX [1]

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

A60

Bmyvalue

CGET

DDEL

Attempts:

3 left

💡 Hint

Common Mistakes

Using a command name instead of a number for expiration.

Omitting the expiration time.

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

2fill in blank

medium

Complete the code to retrieve the value of a key in Redis.

Redis

[1] mykey

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

AEXPIRE

BDEL

CSET

DGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using SET instead of GET.

Using DEL which deletes the key.

The GET command retrieves the value stored at the specified key.

3fill in blank

hard

Fix the error in the code to publish a message to a Redis channel.

Redis

PUBLISH [1] "Hello World"

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

AGET

Bmykey

Cmychannel

DSET

Attempts:

3 left

💡 Hint

Common Mistakes

Using a key name instead of a channel name.

Using a command name instead of a channel.

The PUBLISH command sends a message to a channel. The channel name should be a string like mychannel.

4fill in blank

hard

Fill both blanks to create a Redis hash and set a field value.

Redis

HSET [1] [2] "John"

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

Auser:1000

Bname

Cage

Dmykey

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the hash key and field.

Using a simple key instead of a hash key.

HSET sets a field in a hash. The first blank is the hash key, like user:1000. The second blank is the field name, like name.

5fill in blank

hard

Fill all three blanks to subscribe to a Redis channel and receive messages.

Redis

SUBSCRIBE [1] [2] [3]

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

Anews

Bupdates

Calerts

Dmykey

Attempts:

3 left

💡 Hint

Common Mistakes

Including a key name instead of a channel.

Using commands instead of channel names.

The SUBSCRIBE command listens to one or more channels. Here, the blanks are channel names like news, updates, and alerts.