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What do the basic SET, GET, and DEL commands do in Redis? How do you search for keys matching a specific pattern in Redis, and why is the KEYS command generally discouraged in production? How do you check basic information about a Redis key, such as its data type and remaining time to live? How do you use the EXISTS and RENAME commands, and what should you be careful about when using RENAME? How do you use redis-cli in scripting mode to automate repetitive administrative tasks rather than running commands interactively?
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How would you use redis-cli's built-in monitoring and debugging features to troubleshoot a live performance issue on a production Redis instance?

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You could use the MONITOR command to see a live stream of every command being processed by the server, though carefully since it adds overhead and should be used briefly, the SLOWLOG command to review commands that have taken longer than a configured threshold to execute, and the LATENCY tool to identify specific sources of delay within Redis's internal operations.
redis-cli slowlog get 10
redis-cli latency history command
Real-world example A team investigating intermittent slow responses uses SLOWLOG to identify a specific command pattern that was consistently taking much longer than expected, quickly pinpointing the root cause of their performance issue.

Common follow-ups: Why should MONITOR be used sparingly on a busy production server?;How do you clear the slow log once you have finished reviewing it?

Redis Performance Tuning & Benchmarking;Redis Monitoring & Observability
All 7 Redis CLI & Basic Commands questions