InfluxDB design principles
This page documents an earlier version of InfluxDB. InfluxDB v2.6 is the latest stable version. View this page in the v2.6 documentation.
InfluxDB implements optimal design principles for time series data. Some of these design principles may have associated tradeoffs in performance.
- Time-ordered data
- Strict update and delete permissions
- Handle read and write queries first
- Schemaless design
- Datasets over individual points
- Duplicate data
To improve performance, data is written in time-ascending order.
Strict update and delete permissions
To increase query and write performance, InfluxDB tightly restricts update and delete permissions. Time series data is predominantly new data that is never updated. Deletes generally only affect data that isn’t being written to, and contentious updates never occur.
Handle read and write queries first
InfluxDB prioritizes read and write requests over strong consistency. InfluxDB returns results when a query is executed. Any transactions that affect the queried data are processed subsequently to ensure that data is eventually consistent. Therefore, if the ingest rate is high (multiple writes per ms), query results may not include the most recent data.
InfluxDB uses a schemaless design to better manage discontinuous data. Time series data are often ephemeral, meaning the data appears for a few hours and then goes away. For example, a new host that gets started and reports for a while and then gets shut down.
Datasets over individual points
Because the data set is more important than an individual point, InfluxDB implements powerful tools to aggregate data and handle large data sets. Points are differentiated by timestamp and series, so don’t have IDs in the traditional sense.
To simplify conflict resolution and increase write performance, InfluxDB assumes data sent multiple times is duplicate data. Identical points aren’t stored twice. If a new field value is submitted for a point, InfluxDB updates the point with the most recent field value. In rare circumstances, data may be overwritten. Learn more about duplicate points.
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