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Update direct-db-connection.md

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Trent White
2017-07-27 12:17:53 -04:00
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docs/sources/reference/direct-db-connection.md
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@@ -49,8 +49,8 @@ As you can see, the Grafana-Zabbix plugin uses aggregation by a given time inter
## Functions usage with Direct DB Connection ## Functions usage with Direct DB Connection
There's only one function affecting the backend. This function is `consolidateBy`, which changes what data comes from There's only one function affecting the backend. This function is `consolidateBy`. It changes what data comes from
the backend. Other functions still work on the client side and transform data that comes from the backend. So you should the backend. Other functions still work on the client side and transform data that comes from the backend. So you should
clearly understand that this is pre-aggregated data (by AVG, MAX, MIN, etc). clearly understand that this is pre-aggregated data (by AVG, MAX, MIN, etc).
For example, say you want to group values by 1 hour interval and `max` function. If you just apply `groupBy(10m, max)` function, your result will be wrong, because you would transform data aggregated by default `AVG` function. You should use `consolidateBy(max)` coupled with `groupBy(10m, max)` in order to get a precise result. For example, say you want to group values by 1 hour interval and `max` function. If you just apply `groupBy(10m, max)` function, your result will be wrong, because you would transform data aggregated by default `AVG` function. You should use `consolidateBy(max)` coupled with `groupBy(10m, max)` in order to get a precise result.