AOF (Append Only File) in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable AOF persistence in Redis configuration.

Redis

appendonly [1]

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

Ano

Byes

Cauto

Dmaybe

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'no' disables AOF.

Using invalid values like 'auto' or 'maybe' causes errors.

Setting appendonly yes enables AOF persistence in Redis.

2fill in blank

medium

Complete the command to rewrite the AOF file manually.

Redis

redis-cli [1]

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

ABGREWRITEAOF

BBGSAVE

CSAVE

DFLUSHALL

Attempts:

3 left

💡 Hint

Common Mistakes

Using BGSAVE rewrites the RDB snapshot, not AOF.

SAVE blocks Redis and is not recommended for AOF rewriting.

The BGREWRITEAOF command triggers a background rewrite of the AOF file.

3fill in blank

hard

Fix the error in the AOF fsync policy setting.

Redis

appendfsync [1]

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

Aalways

Bsometimes

Ceverysec

Dnever

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sometimes' or 'never' which are invalid options.

Confusing 'always' with 'everysec' for performance.

The valid options for appendfsync are always, everysec, and no. everysec is the recommended setting for balancing performance and durability.

4fill in blank

hard

Fill both blanks to configure AOF rewrite thresholds.

Redis

auto-aof-rewrite-percentage [1]
auto-aof-rewrite-min-size [2]

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

A100

B64mb

C50

D128mb

Attempts:

3 left

💡 Hint

Common Mistakes

Setting percentage too high or too low.

Using invalid size units.

The default settings are auto-aof-rewrite-percentage 50 and auto-aof-rewrite-min-size 64mb to trigger AOF rewrite when the file grows 50% larger and is at least 64 MB.

5fill in blank

hard

Fill all three blanks to configure AOF persistence with safe fsync and rewrite settings.

Redis

appendonly [1]
appendfsync [2]
auto-aof-rewrite-percentage [3]

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

Ayes

Beverysec

C100

Dno

Attempts:

3 left

💡 Hint

Common Mistakes

Disabling AOF by setting appendonly to no.

Using unsafe fsync settings.

Setting rewrite percentage too low.

This configuration enables AOF persistence, sets fsync to every second for safety and performance, and triggers rewrite when AOF grows 100% larger.