查看InfluxDB Quick Start的源代码

== Key Concepts ==

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=== Database ===

A logical container for users, retention policies, continuous queries, and time series data

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=== Measurement ===

The part of InfluxDB’s structure that describes the data stored in the associated fields. Measurements are strings.

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=== Tag ===

The key-value pair in InfluxDB’s data structure that records metadata. Tags are an optional part of InfluxDB’s data structure but they are useful for storing commonly-queried metadata; tags are indexed so queries on tags are performant. Query tip: Compare tags to fields; fields are not indexed.

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==== Tag Key ====

The key part of the key-value pair that makes up a tag. Tag keys are strings and they store metadata. Tag keys are indexed so queries on tag keys are performant. Query tip: Compare tag keys to field keys; field keys are not indexed.

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==== Tag Value ====

The value part of the key-value pair that makes up a tag. Tag values are strings and they store metadata. Tag values are indexed so queries on tag values are performant.

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==== Tag Set ====

The collection of tag keys and tag values on a point.

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=== Field ===

The key-value pair in InfluxDB’s data structure that records metadata and the actual data value. 

Fields are required in InfluxDB’s data structure and they are <b>not indexed</b> - queries on field values scan all points that match the specified time range and, as a result, are not performant relative to tags. 

Query tip: Compare fields to tags; <b>tags are indexed.</b>

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==== Field Key ====

The key part of the key-value pair that makes up a field. Field keys are strings and they store metadata.

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==== Field Value ====

The value part of the key-value pair that makes up a field. 

* Field values are the actual data;
* They can be strings, floats, integers, or booleans.
* It is always associated with a timestamp.


<b>Field values are not indexed</b> - queries on field values scan all points that match the specified time range and, as a result, are not performant.

Query tip: Compare field values to tag values; tag values are indexed.

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==== Field Set ====

The collection of field keys and field values on a point.

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=== Series ===

The collection of data in InfluxDB’s data structure that share a measurement, tag set, and retention policy. Note: The field set is not part of the series identification!

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