@@ -154,7 +154,7 @@ Since not all datasources have the same configuration settings we only have the
| tlsAuthWithCACert | boolean | *All* | Enable TLS authentication using CA cert |
| tlsSkipVerify | boolean | *All* | Controls whether a client verifies the server's certificate chain and host name. |
| graphiteVersion | string | Graphite | Graphite version |
| timeInterval | string | Elastic, InfluxDB & Prometheus | Lowest interval/step value that should be used for this data source |
| timeInterval | string | Prometheus, Elasticsearch, InfluxDB, MySQL, PostgreSQL & MSSQL | Lowest interval/step value that should be used for this data source |
| esVersion | number | Elastic | Elasticsearch version as a number (2/5/56) |
| timeField | string | Elastic | Which field that should be used as timestamp |
| interval | string | Elastic | Index date time format |
A lower limit for the [$__interval](/reference/templating/#the-interval-variable) and [$__interval_ms](/reference/templating/#the-interval-ms-variable) variables.
Recommended to be set to write frequency, for example `1m` if your data is written every minute.
This option can also be overridden/configured in a dashboard panel under data source options. It's important to note that this value **needs** to be formatted as a
number followed by a valid time identifier, e.g. `1m` (1 minute) or `30s` (30 seconds). The following time identifiers are supported:
Identifier | Description
------------ | -------------
`y` | year
`M` | month
`w` | week
`d` | day
`h` | hour
`m` | minute
`s` | second
`ms` | millisecond
### Database User Permissions (Important!)
The database user you specify when you add the data source should only be granted SELECT permissions on
A lower limit for the [$__interval](/reference/templating/#the-interval-variable) and [$__interval_ms](/reference/templating/#the-interval-ms-variable) variables.
Recommended to be set to write frequency, for example `1m` if your data is written every minute.
This option can also be overridden/configured in a dashboard panel under data source options. It's important to note that this value **needs** to be formatted as a
number followed by a valid time identifier, e.g. `1m` (1 minute) or `30s` (30 seconds). The following time identifiers are supported:
Identifier | Description
------------ | -------------
`y` | year
`M` | month
`w` | week
`d` | day
`h` | hour
`m` | minute
`s` | second
`ms` | millisecond
### Database User Permissions (Important!)
The database user you specify when you add the data source should only be granted SELECT permissions on
*Version* | This option determines which functions are available in the query builder (only available in Grafana 5.3+).
*TimescaleDB* | TimescaleDB is a time-series database built as a PostgreSQL extension. If enabled, Grafana will use `time_bucket` in the `$__timeGroup` macro and display TimescaleDB specific aggregate functions in the query builder (only available in Grafana 5.3+).
### Min time interval
A lower limit for the [$__interval](/reference/templating/#the-interval-variable) and [$__interval_ms](/reference/templating/#the-interval-ms-variable) variables.
Recommended to be set to write frequency, for example `1m` if your data is written every minute.
This option can also be overridden/configured in a dashboard panel under data source options. It's important to note that this value **needs** to be formatted as a
number followed by a valid time identifier, e.g. `1m` (1 minute) or `30s` (30 seconds). The following time identifiers are supported:
@@ -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).
