XTRIM for stream capping in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to trim the stream to a maximum length of 1000 entries.

Redis

XTRIM mystream MAXLEN [1]

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

A1000

B5000

C100

D10000

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number too large or too small for the intended cap.

Forgetting to specify MAXLEN before the number.

The MAXLEN option limits the stream length. Using 1000 caps the stream at 1000 entries.

2fill in blank

medium

Complete the code to trim the stream approximately to 500 entries using the ~ option.

Redis

XTRIM mystream MAXLEN ~ [1]

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

A200

B1000

C500

D50

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the ~ for approximate trimming.

Using a wrong number for the desired cap.

The ~ option allows approximate trimming. Setting MAXLEN ~ 500 caps the stream near 500 entries.

3fill in blank

hard

Fix the error in the command to trim the stream to exactly 200 entries.

Redis

XTRIM mystream MAXLEN [1]

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

A200

B300

C2000

D20

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number too large or too small for the intended cap.

Confusing exact and approximate trimming options.

The MAXLEN 200 option (without ~) trims the stream exactly to 200 entries.

4fill in blank

hard

Fill both blanks to trim the stream to exactly 300 entries without approximate trimming.

Redis

XTRIM mystream MAXLEN [1] [2]

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

A300

B~

CEXACT

DMINID

Attempts:

3 left

💡 Hint

Common Mistakes

Using ~ for approximate trimming when exact is needed.

Using MINID instead of EXACT for length-based trimming.

Using MAXLEN 300 EXACT trims the stream exactly to 300 entries without approximation.

5fill in blank

hard

Fill all three blanks to trim the stream by minimum ID, keeping entries with IDs greater than or equal to 1609459200000-0.

Redis

XTRIM mystream [1] [2] [3]

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

AMINID

B1609459200000-0

CEXACT

DMAXLEN

Attempts:

3 left

💡 Hint

Common Mistakes

Using MAXLEN instead of MINID for ID-based trimming.

Omitting EXACT for precise trimming.

The command XTRIM mystream MINID 1609459200000-0 EXACT trims the stream by removing entries with IDs less than the given ID, exactly.