github-mirrors/VictoriaMetrics
1
0
Fork 0
mirror of https://github.com/VictoriaMetrics/VictoriaMetrics.git synced 2024-11-21 14:44:00 +00:00
Code Issues Projects Releases Packages Wiki Activity

docs/keyConcepts.md: clarify which values can be stored in VictoriaMetrics without precision loss

Browse source 
This is a follow-up for 43d7de4afe

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5485
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5503
This commit is contained in:
Aliaksandr Valialkin 2024-01-16 15:50:25 +02:00
parent ecce2d6db1
commit f2f0468ae7
No known key found for this signature in database
GPG key ID: 52C003EE2BCDB9EB
1 changed files with 4 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
docs/keyConcepts.md
View file

@ -80,9 +80,11 @@ See [these docs](https://docs.victoriametrics.com/FAQ.html#what-is-high-cardinal
#### Raw samples #### Raw samples
Every unique time series may consist of an arbitrary number of `(value, timestamp)` data points (aka `raw samples`) sorted by `timestamp`. Every unique time series may consist of an arbitrary number of `(value, timestamp)` data points (aka `raw samples`) sorted by `timestamp`.
VictoriaMetrics stores all the `values` as [float64](https://en.wikipedia.org/wiki/Double-precision_floating-point_format) values VictoriaMetrics stores all the `values` as [float64](https://en.wikipedia.org/wiki/Double-precision_floating-point_format)
with [extra compression](https://faun.pub/victoriametrics-achieving-better-compression-for-time-series-data-than-gorilla-317bc1f95932) applied. with [extra compression](https://faun.pub/victoriametrics-achieving-better-compression-for-time-series-data-than-gorilla-317bc1f95932) applied.
This guarantees precision correctness for values with up to 12 significant decimal digits ([-2^54 ... 2^54-1]). This allows storing precise integer values with up to 12 decimal digits and any floating-point values with up to 12 significant decimal digits.
If the value has more than 12 significant decimal digits, then the less significant digits can be lost when storing them in VictoriaMetrics.
The `timestamp` is a [Unix timestamp](https://en.wikipedia.org/wiki/Unix_time) with millisecond precision. The `timestamp` is a [Unix timestamp](https://en.wikipedia.org/wiki/Unix_time) with millisecond precision.
Below is an example of a single raw sample Below is an example of a single raw sample