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docs: add data flow chart for direct DB connection

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Alexander Zobnin
2017-07-24 23:24:50 +03:00
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docs/sources/reference/direct-db-connection.md
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@@ -13,6 +13,14 @@ size. Data loads faster and client doesn't spend time for data processing.
Also, many users point better performance of direct database queries versus API calls. This caused by several reasons, Also, many users point better performance of direct database queries versus API calls. This caused by several reasons,
such as additional PHP layer and additional SQL queries (user permissions checks). such as additional PHP layer and additional SQL queries (user permissions checks).
## Data Flow
This chart illustrates how plugin uses both Zabbix API and MySQL data source for querying different types
of data from Zabbix. MySQL data source is used only for pulling history and trend data instead of `history.get`
and `trend.get` API calls.
[![Direct DB Connection](../img/reference-direct-db-connection.svg)](../img/reference-direct-db-connection.svg)
## Query structure ## Query structure
Grafana-Zabbix uses queries like this for getting history: Grafana-Zabbix uses queries like this for getting history: