Splunk Search

Using fillnull for multiple fields?

dannyzen
Explorer

What is the best way to use fillnull for multiple fields? What is the best way to avoid it working for only the first field?
Some examples are:
| fillnull value=NULL field1 field2 field3
| fillnull value=NULL field1 | fillnull value=NULL field2 | fillnull value=NULL field3

Thank You

0 Karma
1 Solution

niketn
Legend

@dannyzen, I would choose the following above adding separate pipes for each fillnull. Separate pipe means entire record will be used again for the 2nd fillnull and so on. The fillnull command being a streaming command it would make sense to call in a single place.

| fillnull value=NULL field1 field2 field3

However, you can definitely test the actual performance using Job Inspector for both the compare and see the response time for yourself.

____________________________________________
| makeresults | eval message= "Happy Splunking!!!"

View solution in original post

dannyzen
Explorer

Thank you
I will group the fields as field1 field2 field3

0 Karma

ssadanala1
Contributor

If wanted to substitute values for null values in all the fields
you can specify |fillnull

0 Karma

niketn
Legend

@dannyzen, I would choose the following above adding separate pipes for each fillnull. Separate pipe means entire record will be used again for the 2nd fillnull and so on. The fillnull command being a streaming command it would make sense to call in a single place.

| fillnull value=NULL field1 field2 field3

However, you can definitely test the actual performance using Job Inspector for both the compare and see the response time for yourself.

____________________________________________
| makeresults | eval message= "Happy Splunking!!!"

niketn
Legend

@dannyzen I have converted comment to Answer. Please accept to mark this question as answered!

____________________________________________
| makeresults | eval message= "Happy Splunking!!!"
0 Karma
Got questions? Get answers!

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Meet up IRL or virtually!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

Get Updates on the Splunk Community!

Cisco Data Fabric from Architecture to Investigation, Better SOC Visibility, and More ...

Splunk Lantern is Splunk’s customer success center that provides practical guidance from Splunk experts on key ...

The Trust Gap: Why a Data Foundation is Fundamental to an Agentic Enterprise

The Trust Gap: Why a data foundation is fundamental to an  Agentic Enterprise.   Agentic AI is transforming ...

Data Management Digest – September 2026

    Welcome to the September 2026 edition of Data Management Digest! September brought a fresh wave of ...