The error parameter value is important to making the count_distinct function return results quickly and in a scalable way.Īlso, note that when you want to count the distinct occurrences of more than one field, you must create an alias using the as operator to rename the _count_distinct fields. So for example, if the true count of distinct items is 1,000, the result returned by the approximation algorithm is between 9 about 95% of the time. 99% of the time, results are within +/- 6%. Adding bucket and another stats command, we can calculate for a custom period of time, as follows: index'summaryimplsplunk' searchname'summary - count.95% of the time, results are within +/- 4%.By default, if the actual number of distinct values returned by a search is below 1000, the Splunk software does not estimate the distinct value count for the search. Many of the functions available in stats mimic similar functions in SQL or Excel, but there are many functions unique to Splunk. You can use this function with the chart, stats, timechart, and tstats commands. 65% of the time, results are within +/- 2%. The string values 1.0 and 1 are considered distinct values and counted separately.The approximation algorithm uses a relative error parameter of 2%, for example: stats functions count number of events (individual count) dc (distinct count) Count of unique values (count of group/field value not events) sum Sum of. If the number of distinct items returned is larger than 100, count_distinct instead uses an approximate algorithm, and displays a message that explains: count_distinct saw more than 100 values, results may be approximate If the number of distinct items returned is less than 100, the count_distinct function provides an exact number. Using the by clause, stats will produce a row per. The basic structure of a stats statement is: stats functions by fields. To order your results, use the sort operator. Splunk Get Unique Valuesfor myfield for each 1-minute bucket sourcelogs xxx rex my-field. By default, ordering is not defined inside of groups created using a group-by expression.
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