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Add series cardinality note to tags info per DAR #106

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noramullen1 2020-08-10 13:27:37 -07:00
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content/v2.0/reference/key-concepts/data-elements.md
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@ -107,6 +107,11 @@ location = portland, scientist = mullen
Because tags are indexed, queries on tags are faster than queries on fields. This makes tags ideal for storing commonly-queried metadata. Because tags are indexed, queries on tags are faster than queries on fields. This makes tags ideal for storing commonly-queried metadata.
{{% /note %}} {{% /note %}}
{{% note %}}
Tags containing highly variable information like UUIDs, hashes, and random strings will lead to a large number of series in the database, known as **high series cardinality**. High series cardinality is a primary driver of high memory usage for many database workloads. See [series cardinality](v2.0/reference/glossary/#series-cardinality) for more information.
{{% /note %}}
#### Why your schema matters #### Why your schema matters
If most of your queries focus on values in the fields, for example, a query to find when 23 bees were counted: If most of your queries focus on values in the fields, for example, a query to find when 23 bees were counted: