Session storage pattern in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a session key with a value in Redis.

Redis

SET session:user123 [1]

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

A"active"

BEXPIRE

CGET

DDEL

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands like EXPIRE or GET instead of a value.

Forgetting to provide a value after the key.

The SET command stores a key with a value. Here, we set the session key session:user123 to the string "active".

2fill in blank

medium

Complete the code to set an expiration time of 3600 seconds on a session key.

Redis

EXPIRE session:user123 [1]

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

A60

B0

C1800

D3600

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 which means no expiration.

Using a time too short or too long by mistake.

The EXPIRE command sets the time to live for a key in seconds. Here, 3600 seconds means the session expires in one hour.

3fill in blank

hard

Fix the error in the command to retrieve the session value.

Redis

[1] session:user123

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

ASET

BEXPIRE

CGET

DDEL

Attempts:

3 left

💡 Hint

Common Mistakes

Using SET instead of GET to retrieve data.

Using EXPIRE or DEL which do not return the value.

The GET command retrieves the value stored at the given key. Using SET or others here would cause errors or wrong behavior.

4fill in blank

hard

Fill both blanks to delete a session key and then check if it still exists.

Redis

DEL [1]
EXISTS [2]

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

Asession:user456

Bsession:user123

Csession:user789

Dsession:user000

Attempts:

3 left

💡 Hint

Common Mistakes

Using different keys in DEL and EXISTS commands.

Using keys that were not set before.

We delete the session key session:user123 and then check if it exists. Both commands use the same key.

5fill in blank

hard

Fill all three blanks to set a session key with a value and expiration in one command.

Redis

SET [1] [2] [3] 1800

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

Asession:user789

B"logged_in"

CEX

DNX

Attempts:

3 left

💡 Hint

Common Mistakes

Using NX which means set only if key does not exist, not expiration.

Forgetting to put quotes around the value string.

This command sets the key session:user789 with the value "logged_in" and expiration time of 1800 seconds (30 minutes). The EX option specifies the expiration in seconds.