public/grafana
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

docs: sql datasources min time interval

Browse Source
This commit is contained in:
Marcus Efraimsson
2018-09-06 13:52:16 +02:00
parent cb526d4557
commit db639684bb
5 changed files with 12 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/sources/reference/templating.md
+1 -1
View File
@@ -245,7 +245,7 @@ Grafana has global built-in variables that can be used in expressions in the que
### The $__interval Variable
This $__interval variable is similar to the `auto` interval variable that is described above. It can be used as a parameter to group by time (for InfluxDB), Date histogram interval (for Elasticsearch) or as a *summarize* function parameter (for Graphite).
This $__interval variable is similar to the `auto` interval variable that is described above. It can be used as a parameter to group by time (for InfluxDB, MySQL, Postgres, MSSQL), Date histogram interval (for Elasticsearch) or as a *summarize* function parameter (for Graphite).
Grafana automatically calculates an interval that can be used to group by time in queries. When there are more data points than can be shown on a graph then queries can be made more efficient by grouping by a larger interval. It is more efficient to group by 1 day than by 10s when looking at 3 months of data and the graph will look the same and the query will be faster. The `$__interval` is calculated using the time range and the width of the graph (the number of pixels).