Splunk Search

list all fields within a sourcetype



Is there a way to display all fields being used by a sourcetype, without the values?


If you have 6x you could run the following search. Adjust the initial search to limit scope and then adjust the dedup piece to attempt to capture enough of your sourcetype to get the majority of the fields. There is a balance to be struck /shrug

<search to limit scope> | dedup 20 sourcetype punct | table * | fields - _raw date_* index linecount punct eventtype time*pos splunk_server  | foreach * [eval <<FIELD>> = '<<FIELD>>'."##".sourcetype."##||" ] | stats max(*) as * |  transpose | rename "row 1" as sourcetype column as field | rex field=sourcetype "##(?<sourcetype>[^#]+)" | eval fieldsort = lower(field) | dedup sourcetype field | sort sourcetype fieldsort | table sourcetype field

Splunk Employee
Splunk Employee

It depends on the version of Splunk that you're running. If you're on 5.0 or above, you can use the new fieldsummary command.

Ex. index=my_index sourcetype=my_sourcetype | fieldsummary

fieldsummary does not work on metadata so it needs to scan all events for all possible fields. This means that it can be pretty expensive if not scoped properly in time.
Additional info here: http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/Fieldsummary


I like it! if we are only interested in fields likely on every record of a sourcetype, we could speed it up by only taking the first record found:

index=my_index sourcetype=my_sourcetype | head 1| fieldsummary

furthermore, if we are only interested in a summary the field values (say to search on where certain named fields appear), we can aggregate those

index=pan_logs sourcetype=pan:traffic 
| head 1
| fieldsummary 
| table field
| mvcombine delim=", " field 
| nomv field

This works well. You can remove some extraneous information if you want just the fields, count and value

index=my_index sourcetype=my_sourcetype | fieldsummary | fields - max mean min stdev numeric_count is_exact

0 Karma

Splunk Employee
Splunk Employee

No. The fields that exist are determined dynamically depending on the data, and so can not be determined without looking at sufficient data from that sourcetype. There is no way without looking at every piece of data to know with 100% certainty that you have seen all possible fields.

0 Karma
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