![]() ![]() The values and list functions also can consume a lot of memory. For example, the distinct_count function requires far more memory than the count function. Some functions are inherently more expensive, from a memory standpoint, than other functions. | eval A1=A | timechart sum(A) by A1 span=log2 Functions and memory usage However, you can work around this with an eval expression, for example: For example, you will not be able to run: You cannot use a field that you specify in a function as your split-by field. If you specify these arguments after the split-by field, Splunk software assumes that you want to control the bins on the split-by field, not on the time axis. If you specify a split-by field, ensure that you specify the bins and span arguments before the split-by field. You can calculate per_hour() on one field and per_minute(), or any combination of the functions, on a different field in the same search. If you want the span to be 1h, you still have to specify the argument span=1h in your search. If your chart span ends up being 30m, it is sum()*2. The resulting span can depend on the search time range.įor example, per_hour() converts the field value so that it is a rate per hour, or sum(). These functions are used to get a consistent scale for the data when an explicit span is not provided. The functions, per_day(), per_hour(), per_minute(), and per_second() are aggregation functions and are not responsible for setting a time span for the resultant chart. Do not use not span=24h, or span=1440m, or span=86400s. In part this is due to differences in daylight savings time for different locales. There is no guarantee that the bin start time used by the timechart command corresponds to your local timezone. The span option always rounds down the starting date for the first bin. The minimum span that can be used is 1800 seconds, or 30 minutes. For example, if you specify minspan=15m that is equivalent to 900 seconds. When you specify a minspan value, the span that is used for the search must be equal to or greater than one of the span threshold values in the following table. It you use the predefined time ranges in the time range picker, and do not specify the span argument, the following table shows the default span that is used. If you do not specify either bins or span, the timechart command uses the default bins=100. The timechart command accepts either the bins argument OR the span argument. Source="access_30day.The timechart command is a transforming command, which orders the search results into a data table. Set status to some simple http error codes source="access_30day.log" | eval error_msg = case(status = 404, "Not found", status = 500, "Internal Server Error", status = 200, "OK") index=perfmon sourcetype=Perfmon* counter=* Value=* | eval = Value Assign to the new field the value of the Value field. In this example, use each value of the field counter to make a new field name. Use the value of one field as the name for a new field | eval error = if(status = 200, "OK", "Problem") Otherwise set the error field value to Problem. Using the if function, set the value in the error field to OK if the status value is 200. Use the if function to analyze field valuesĬreate a field called error in each event. | fieldformat time_since_last = tostring(time_since_last, "duration") | streamstats current=f global=f window=1 last(_time) as last_ts ![]() Homework Server's Time host=homework usr=* | eval timesstamp=strftime(_time, "%I:%M") | table timesstamp usrĪdd a field to each event which is the time between this event and the previous one. The eval command creates new fields in your events by using existing fields and an arbitrary expression. The stats command calculates statistics based on fields in your events. Difference between eval and stats commands If the field name that you specify matches a field name that already exists in the search results, the results of the eval expression overwrite the values in that field. If the field name that you specify does not match a field in the output, a new field is added to the search results. The eval command evaluates mathematical, string, and boolean expressions. Use: The eval command calculates an expression and puts the resulting value into a search results field. Splunk Commands Tutorials & Reference:- Commands Category: Filtering Commands: eval ![]()
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