Combining Multiple Fields in Charting

[blurblebot]

Given a data set with events that fall into X categories and Y subcategories, can I display a chart that shows a column or portion-of-pie or bar for each combination of X/Y?

Example data set

server=main cat=a sub=1
server=alt cat=b sub=1
server=main cat=c sub=1
server=main cat=a sub=2
server=alt cat=b sub=2
server=main cat=c sub=2
server=main cat=b sub=3
server=alt cat=c sub=3

For the chart of the above data, the chart shows one bar for count of all cat=a/sub=1 events, one shows all cat=b/sub=1 events, etc.

Bonus Vocab Quiz: 1) what are the sections (bars, columns, portions of pie) of a chart to be referred to as in splunkese?

[gkanapathy · Accepted solution]

... | eval series=cat."/".sub | chart count by series

I would refer to each section as a "series" or "data series".

[Stephen_Sorkin]

If you have repeated "sub" values as in your example, you may want to consider a search like:

... | chart count by cat sub

This will make a table like:

cat 1 2 3
--- - - -
a   . . .
b   . . .
c   . . .

This is useful if you want a stacked column chart to be rendered in the UI, so that you can see each combination as well as the total for each category.