10 Value cache

Overview

This in-memory cache can be used for accessing historical data, instead of making direct SQL calls to the database. If historical values are not present in the cache, the missing values are requested from the database and the cache updated accordingly.

Value cache status can be observed by using the server option (or diaginfo=valuecache) and inspecting the section for value cache diagnostic information. This can be useful for determining misconfigured triggers or calculated items.

Two internal items are supported for monitoring the value cache: zabbix[vcache,buffer,<mode>] and zabbix[vcache,cache,<parameter>]. See more details with internal items.