RDB snapshots (point-in-time) in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to save a snapshot of the Redis database.

Redis

redis-cli [1]

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

ASAVE

BGET

CDEL

DSET

Attempts:

3 left

💡 Hint

Common Mistakes

Using GET instead of SAVE will only retrieve data, not save it.

DEL deletes keys, not snapshots.

SET sets values, not snapshots.

The SAVE command forces Redis to create a snapshot of the database immediately.

2fill in blank

medium

Complete the code to trigger a background save of the Redis database.

Redis

redis-cli [1]

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

ASAVE

BBGSAVE

CFLUSHDB

DEXPIRE

Attempts:

3 left

💡 Hint

Common Mistakes

Using SAVE blocks Redis until the save is complete.

FLUSHDB deletes all keys in the current database.

EXPIRE sets a timeout on keys, not related to saving.

The BGSAVE command tells Redis to save the database in the background without blocking clients.

3fill in blank

hard

Fix the error in the command to check the last save time of Redis.

Redis

redis-cli [1]

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

ASAVETIME

BLASTSAVE_TIME

CGETLASTSAVE

DLASTSAVE

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands that do not exist like LASTSAVE_TIME or GETLASTSAVE.

Trying to use SAVETIME which is not a Redis command.

The correct command to check the last successful save time is LASTSAVE.

4fill in blank

hard

Fill both blanks to configure Redis to save a snapshot every 5 minutes if at least 100 keys changed.

Redis

save [1] [2]

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

A300

B60

C100

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 60 seconds instead of 300 for 5 minutes.

Confusing the order of time and number of keys.

The configuration save 300 100 means Redis saves a snapshot every 300 seconds (5 minutes) if at least 100 keys changed.

5fill in blank

hard

Fill all three blanks to create a Redis configuration line that saves a snapshot every 15 minutes if at least 50 keys changed.

Redis

save [1] [2] save [3] 1

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

A900

B50

C300

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the time values for 15 and 5 minutes.

Using incorrect number of keys for the second save.

This configuration saves snapshots at two intervals: every 900 seconds (15 minutes) if 50 keys changed, and every 300 seconds (5 minutes) if at least 1 key changed.