Tdb V2 -

-- Retention CREATE RETENTION POLICY raw ON fleet DURATION 7d REPLICATION 1; CREATE RETENTION POLICY hour ON fleet DURATION 365d; -- Downsample automatically CREATE CONTINUOUS QUERY auto_downsample ON fleet BEGIN SELECT mean(temp) AS temp_avg, max(temp) AS temp_max INTO fleet.hour.:measurement FROM fleet.raw.:measurement GROUP BY time(1h), * END;

Note: If you are referring to a specific proprietary system (e.g., a company’s internal TDB, a renamed tool like TDengine, or a module in Apache Jena), this guide covers general principles of modern TDB V2 architecture. Adjust based on your actual stack. 1. What is TDB V2? TDB V2 represents the second generation of time-series databases designed for ingestion velocity , compression efficiency , and analytical speed on time-stamped data. tdb v2

downsample: enabled: true rules: - from: raw to: 5m agg: [avg, max, min, count] Measurement (like SQL table) ├── Timestamp (always present, nanosecond precision) ├── Tags (indexed, low-cardinality) → e.g., device_id, region └── Fields (numeric, high-cardinality, compressed) → e.g., temperature, voltage Example write (Influx-like line protocol): -- Retention CREATE RETENTION POLICY raw ON fleet