Combined RDB + AOF in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to enable both RDB and AOF persistence in Redis.

Redis

redis-cli CONFIG SET [1] yes

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

Asave

Bappendfsync

Cappendonly

Drdbcompression

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'save' which controls RDB snapshots, not AOF.

Confusing 'appendfsync' which controls fsync frequency.

Using 'rdbcompression' which controls RDB file compression.

The appendonly option enables AOF persistence in Redis.

2fill in blank

medium

Complete the command to configure Redis to save RDB snapshots every 60 seconds if at least 1000 keys changed.

Redis

redis-cli CONFIG SET save "[1] 1000"

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A60

B30

C900

D300

Attempts:

3 left

💡 Hint

Common Mistakes

Using 30 seconds which is too short for this setting.

Using 900 or 300 which are longer intervals.

The save option uses pairs of seconds and changes. Here, 60 seconds is the time interval.

3fill in blank

hard

Fix the error in the command to set AOF fsync policy to every second.

Redis

redis-cli CONFIG SET appendfsync [1]

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Aalways

Bnever

Cno

Deverysec

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'always' which fsyncs after every write and is slower.

Using 'no' or 'never' which disables fsync.

The correct value for fsync every second is everysec.

4fill in blank

hard

Fill both blanks to configure Redis to save RDB snapshots every 300 seconds if at least 10 keys changed.

Redis

redis-cli CONFIG SET save "[1] [2]"

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A300

B10

C100

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of seconds and changes.

Using too large or too small numbers.

The save option requires pairs of seconds and number of changes. Here, 300 seconds and 10 changes.

5fill in blank

hard

Fill all three blanks to create a command that enables AOF, sets fsync policy to every second, and configures RDB save interval to 900 seconds with 50 changes.

Redis

redis-cli CONFIG SET [1] yes && redis-cli CONFIG SET appendfsync [2] && redis-cli CONFIG SET save "[3] 50"

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

Aappendonly

Beverysec

C900

Dsave

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'save' instead of 'appendonly' for enabling AOF.

Using 'always' instead of 'everysec' for fsync.

Using wrong save interval values.

This command enables AOF (appendonly), sets fsync to every second (everysec), and saves RDB snapshots every 900 seconds if 50 keys changed.