Cardinality v2 versus v1

[Giovanni_Luisotto]

You can find a comprehensive answer here:

Series cardinality calculation

@matias In InfluxDB OSS (both 1.x and 2.x), a series is defined by a common measurement and tag set (not field key). In InfluxDB Cloud, the field key is considered part of the series definition. This is because field keys are indexed in InfluxDB Cloud, but they are not indexed in InfluxDB OSS. The reason cardinality matters is due to the efficiency of the index. If there’s too much cardinality in the database as a whole, the index can grow very large and InfluxDB will start to consume a lot of …