Time-series database

InfluxDB

Purpose-built time-series database for metrics and events.

Stores timestamped measurements with tags and fields, with retention periods and downsampling. InfluxDB 3 is rebuilt in Rust on Apache Arrow, DataFusion and Parquet, and adds SQL alongside InfluxQL.

Data model: Time-series
Vendor: InfluxData
License: MIT / Apache 2.0 core; commercial editions
Articles: 1

InfluxDBIntermediate

What is series cardinality in InfluxDB, and why is it slowing everything down?

Every distinct tag value creates new series. Unbounded tags such as IDs and URLs cause slow writes, query timeouts and OOMs. Measure cardinality and fix the schema.

#performance#schema-design#troubleshooting

Tanishk · 7 min

Oct 30, 2026