Regarding the characteristics of Redis, which of the following descriptions is correct? (multiple choice)

The correct answer is A. Low latency B. Rich data structure C. Support data persistence. Redis earns A (Low latency) because it stores data entirely in memory, delivering sub-millisecond read/write speeds. B (Rich data structure) applies because Redis natively supports strings, lists, sets, sorted sets, hashes, bitmaps, and more - far beyond simple key-value pairs…

Big Data Application Development Best Practices

Question

Options

ALow latency
BRich data structure
CSupport data persistence
DSupport SQL query interface

How the community answered

(35 responses)

A
83% (29)
D
17% (6)

Explanation

Redis earns A (Low latency) because it stores data entirely in memory, delivering sub-millisecond read/write speeds. B (Rich data structure) applies because Redis natively supports strings, lists, sets, sorted sets, hashes, bitmaps, and more - far beyond simple key-value pairs. C (Support data persistence) is correct because Redis offers RDB snapshots and AOF (Append-Only File) logging to persist data to disk, countering the misconception that in-memory means volatile.

D is wrong because Redis has no SQL query interface - it uses its own command-based API (e.g., GET, SET, LPUSH). SQL belongs to relational databases like MySQL or PostgreSQL.

Memory tip: Think of Redis as a "Fast, Flexible, and Durable" in-memory store - Fast (low latency), Flexible (rich structures), Durable (persistence) - but it speaks its own language, not SQL.

Topics

#Redis#In-memory cache#Data persistence#NoSQL

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