In the context of IT Service Intelligence, KPI base searches can be used to share a search definition across multiple KPIs that use the same data source. For example, you may have several KPIs that are based on the same sets of source events, but are measuring on different fields. You can create base searches to consolidate these KPIs, reduce search load, and improve search performance.
For info on KPI base searches, see http://docs.splunk.com/Documentation/ITSI/2.4.0/Configure/HowtocreateKPIsearches#Create_KPI_base_searches
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