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For each event in the search query results that has the specified column_name with a numeric value, add adds the value to the cumulative sum, and when you have reached it reaches the last event, display  displays the sum.

Examples

Example 1:  

* in log.access | sum Bytes Sent 

 Returns the sum Returns the sum of the values in the column Bytes Sent in the events from access log.

Example 2:  

http in log.iis log| sum time-taken | group by c-ip 

From the events from log.iss log that have the text http in their column values, calculates the sum of the values in the time-taken column per each c-ip column value.