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docs: sql datasources min time interval

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Marcus Efraimsson 2018-09-06 13:52:16 +02:00
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2
docs/sources/administration/provisioning.md
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@ -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, MSSQL, MySQL, PostgreSQL & 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 |

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docs/sources/features/datasources/mssql.md
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@ -6,7 +6,7 @@ type = "docs"
[menu.docs]
name = "Microsoft SQL Server"
parent = "datasources"
weight = 7
weight = 8
+++
# Using Microsoft SQL Server in Grafana
@ -34,7 +34,9 @@ Name | Description
*Password* | Database user's password
### Min time interval
A lower limit for the `$__interval` variable. Recommended to be set to write frequency, for example `1m` if your data is written every minute.
A lower limit for the [$__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:

4
docs/sources/features/datasources/mysql.md
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@ -37,7 +37,9 @@ Name | Description
*Password* | Database user's password
### Min time interval
A lower limit for the `$__interval` variable. Recommended to be set to write frequency, for example `1m` if your data is written every minute.
A lower limit for the [$__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:

4
docs/sources/features/datasources/postgres.md
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@ -35,7 +35,9 @@ Name | Description
*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` variable. Recommended to be set to write frequency, for example `1m` if your data is written every minute.
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:

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docs/sources/reference/templating.md
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@ -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).