Database / ValKey Interview questions
Why should you avoid running the KEYS command in production?
KEYS scans the entire keyspace in a single pass on Valkey's main thread, so on a large dataset it can block every other client for a noticeable stretch of time, producing latency spikes or timeouts across the whole deployment.
# Avoid in production: KEYS user:* # Prefer: SCAN 0 MATCH user:* COUNT 100
SCAN returns a cursor and walks the keyspace incrementally in small, non-blocking batches instead, trading a slightly weaker consistency guarantee against concurrent writes for safety at scale.
KEYS is risky in production mainly because it...
SCAN avoids KEYS's blocking behavior by...
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