Hashes, Lists & Sorted Sets

Preview — 3 of 10 questions

What is the correct command to set multiple fields in a Redis Hash at once?

AHSETMANY user:1 {name: "Alice", age: 30}

BHMSET user:1 name "Alice" age 30 email "alice@example.com" (HMSET is the only multi-field option)

CHSET user:1 name "Alice" age 30 email "alice@example.com" (single HSET with multiple field-value pairs)

DSET user:1 name "Alice"; SET user:1 age 30 (separate SET commands)

How do you implement a reliable FIFO queue using Redis Lists?

ARPUSH queue item to enqueue at the tail; LPOP queue to dequeue from the head (FIFO)

BLPUSH queue item to enqueue; LPOP queue to dequeue (LIFO stack behavior)

CSADD queue item to enqueue; SPOP queue to dequeue

DRedis Lists cannot implement FIFO queues; use Sorted Sets instead

What is the difference between SUNION and SINTER for Redis Sets?

ASUNION returns elements in both sets; SINTER returns elements in either set

BSUNION returns all elements from all provided sets (union); SINTER returns only elements that appear in ALL provided sets (intersection)

CSUNION is for sorted sets; SINTER is for unordered sets

DThey are identical but SINTER is faster for small sets

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