influxdb.cardinality() function

influxdb.cardinality() returns the series cardinality of data retrieved from InfluxDB.

Function type signature

(
    start: A,
    ?bucket: string,
    ?bucketID: string,
    ?host: string,
    ?org: string,
    ?orgID: string,
    ?predicate: (r: {B with _value: C, _measurement: string, _field: string}) => bool,
    ?stop: D,
    ?token: string,
) => stream[{_value: int, _stop: time, _start: time}] where A: Timeable, D: Timeable

Parameters

bucket

Bucket to query cardinality from.

bucketID

String-encoded bucket ID to query cardinality from.

org

Organization name.

orgID

String-encoded organization ID.

host

URL of the InfluxDB instance to query.

See InfluxDB Cloud regions or InfluxDB OSS URLs.

token

InfluxDB API token.

start

(Required) Earliest time to include when calculating cardinality.

The cardinality calculation includes points that match the specified start time. Use a relative duration or absolute time. For example, -1h or 2019-08-28T22:00:00Z. Durations are relative to now().

stop

Latest time to include when calculating cardinality.

The cardinality calculation excludes points that match the specified start time. Use a relative duration or absolute time. For example, -1h or 2019-08-28T22:00:00Z. Durations are relative to now(). Default is now().

predicate

Predicate function that filters records. Default is (r) => true.

Examples

• Query series cardinality in a bucket
• Query series cardinality in a measurement//
• Query series cardinality for a specific tag
• Query series cardinality of Data Written In the Last 4 Hours

Query series cardinality in a bucket

import "influxdata/influxdb"

influxdb.cardinality(bucket: "example-bucket", start: time(v: 1))

Note: if points have been written into the future, you will need to add an appropriate stop date

Query series cardinality in a measurement//

import "influxdata/influxdb"

influxdb.cardinality(
    bucket: "example-bucket",
    start: time(v: 1),
    predicate: (r) => r._measurement == "example-measurement",
)

Query series cardinality for a specific tag

import "influxdata/influxdb"

influxdb.cardinality(bucket: "example-bucket", start: time(v: 1), predicate: (r) => r.exampleTag == "foo")

Query Cardinality of Data Written In the Last 4 hours

import "influxdata/influxdb"

influxdb.cardinality(bucket: "example-bucket", start: -4h)