Redis easy
What are the two primary technical benefits of configuring a Redis Replica (Secondary) node in a production topology?
- A It doubles the total write throughput by allowing the client to send writes to any active node.
- B It provides failover redundancy and scale-out read performance by offloading read operations.
- C It automatically converts data into a more efficient columnar format for high-speed analysis.
- D It allows the system to execute long-running Lua scripts without affecting the primary heartbeat.
Answer: B. It provides failover redundancy and scale-out read performance by offloading read operations.
Replicas are mirrors of the Master. If the Master node fails, a Replica can be promoted to Master instantly. Applications can also send 'Read' queries to Replicas, preserving the Master's CPU for 'Writes'.
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- If the Redis memory limit is reached, what specific behavior is exhibited by the `allkeys-lru` eviction policy?
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- How does the Redis background snapshotting process (`BGSAVE`) leverage the operating system's `fork()` mechanism to minimize memory overhead?
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- How does a 'Sorted Set' (ZSET) manage its internal membership and ordering differently from a plain Set?