All 7 RedisTimeSeries questions
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What is RedisTimeSeries, and what kind of data is it specifically designed to handle? How do you add a new data point to a Redis time series, and how do you query a range of recent data? How do you configure automatic downsampling in RedisTimeSeries, where detailed recent data is aggregated into coarser summaries over time? What aggregation functions are available when querying a range of data from a Redis time series, and how do you apply one during a query? How would you design a monitoring system architecture using RedisTimeSeries that efficiently handles both high frequency raw data ingestion and long term historical trend analysis? How does RedisTimeSeries handle labels and how can you use them to query across multiple related time series at once?
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How do you configure a retention period for a Redis time series so old data is automatically removed after a certain amount of time?

Intermediate

Answer

You set a retention period, specified in milliseconds, either when creating the time series or by altering it afterward, and Redis automatically removes any data points older than that configured retention window, keeping the time series from growing indefinitely while retaining only the recent history your application actually needs.
TS.CREATE sensor_data RETENTION 86400000
-- Keeps only the last 24 hours of raw data
Real-world example A high frequency sensor monitoring system configures a twenty four hour retention period for its raw data time series, automatically discarding older detailed readings while relying on downsampled aggregates for longer term historical analysis.

Common follow-ups: How do you change the retention period on an already existing time series?;What happens to data that has already exceeded the configured retention period?

Expiration & Eviction;Redis Modules Overview
All 7 RedisTimeSeries questions