Redis persistence overview (RDB, AOF) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to save the current Redis database state to disk immediately.

Redis

[1]

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

ASAVE

BBGSAVE

CDUMP

DPERSIST

Attempts:

3 left

💡 Hint

Common Mistakes

Using BGSAVE when you need an immediate synchronous save.

Using DUMP which serializes a single key, not the entire database.

The SAVE command performs a synchronous save of the Redis dataset to disk as an RDB snapshot. It blocks the server until complete, unlike BGSAVE which runs in the background.

2fill in blank

medium

Complete the command to append every write operation to the AOF file.

Redis

CONFIG SET appendonly [1]

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

Ano

Byes

Cmaybe

Dauto

Attempts:

3 left

💡 Hint

Common Mistakes

Setting appendonly to 'no' disables AOF.

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

Setting appendonly to yes enables AOF persistence, which logs every write operation.

3fill in blank

hard

Choose the correct command to rewrite the AOF file in the background.

Redis

[1]

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

ABGREWRITEAOF now

BBGREWRITEAOF

CBGREWRITEAOF force

DREWRITEAOF

Attempts:

3 left

💡 Hint

Common Mistakes

Adding arguments like 'now' or 'force' which are not valid.

Using REWRITEAOF which is not a valid Redis command.

The BGREWRITEAOF command takes no arguments. It triggers a background rewrite of the AOF file to compact it. Adding arguments like 'now' or 'force' causes errors.

4fill in blank

hard

Fill both blanks to configure Redis to save RDB snapshots every 60 seconds if at least 1000 keys changed.

Redis

CONFIG SET save "[1] [2]"

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

A60

B1000

C30

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the two numbers.

Using incorrect values like 30 seconds or 500 changes.

The save configuration uses pairs of seconds and number of changes. Here, 60 seconds and 1000 changes trigger a snapshot.

5fill in blank

hard

Fill all three blanks to configure AOF to fsync every second and use the 'everysec' policy.

Redis

CONFIG SET appendfsync [1]
CONFIG SET appendonly [2]
CONFIG SET no-appendfsync-on-rewrite [3]

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

Aalways

Byes

Cno

Deverysec

Attempts:

3 left

💡 Hint

Common Mistakes

Setting appendfsync to 'always' causes more disk writes.

Disabling AOF by setting appendonly to 'no'.

Incorrectly enabling no-appendfsync-on-rewrite.

Setting appendfsync to everysec makes Redis fsync the AOF file every second. appendonly set to yes enables AOF. no-appendfsync-on-rewrite set to no disables skipping fsync during rewrite.