All 7 Redis Monitoring & Observability questions
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What key metrics should you monitor to keep track of a Redis instance's overall health? How do you check the cache hit and miss ratio for a Redis instance being used as a cache, and why does this metric matter? What third party tools are commonly used for more comprehensive monitoring and visualization of Redis metrics beyond the built-in commands? How do you use the LATENCY command family in Redis to identify specific sources of delay within the server's internal operations? How would you set up proactive alerting for a production Redis instance to catch problems before they significantly impact your application? How would you diagnose a sudden, unexplained increase in Redis latency using the various monitoring tools and commands available?
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What is the Redis slow log, and how do you use it to identify commands that are taking longer than expected to execute?

Intermediate

Answer

The slow log automatically records any command that takes longer than a configured threshold to execute, and you review it using the SLOWLOG GET command, which shows you the specific slow commands along with their execution time, helping you identify problematic queries or patterns that might be affecting your overall Redis performance.
CONFIG SET slowlog-log-slower-than 10000
SLOWLOG GET 10
Real-world example A team investigating occasional latency spikes reviews their slow log, discovering a specific command pattern from a reporting script was consistently appearing, leading them to optimize that particular operation.

Common follow-ups: What unit is the slowlog-log-slower-than threshold measured in?;How much history does the slow log retain by default?

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