You have created an architecture that will make it very difficult to code an efficent search. In addition, including a wildcard into the csv means you need to strip the wildcard out before line 8 adds the concatenated %, or your results will be in error. Also, I’m not sure how you got that to work at all with a hyphen in the middle of the field names; I would expect Splunk to have replaced that with an underscore.
Here are some suggestions.
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First, limit the initial selection by sourcetype. This should reduce the number of records involved. Something like this should speed the query up a bit…
index=”application_error” [| inputlookup my_lookup_table.csv | rename Field_SourceType as sourcetype, Field_Substring as killname | format | rex field=search mode=sed “s/killname=//g” ]
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If your sourcetypes have multiple extensions on them, then you will want to concatenate a “*” on them above, after the rename and before the format.
Next, kill all unneeded fields, thereby limiting the number of bytes involved. We’re saving the field _time just in case you want a timechart or something, and sourcetype to try something later.
Come back and strip those out if you don’t need them; a byte’s a byte.
| rename _time as Time | eval Raw = lower(_raw) | fields – _* | fields Time Raw sourcetype
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Run that into your current search and see what happens to your run time.
One other potential architecture for this next section is to do a join on sourcetype. This could be much more efficient as long as the lookup table has less than a few thousand lines and as long as the sourcetype does NOT have multiple potential extensions on it.
Adapt the method as needed. For example, you could create a synthetic match field of a certain length, and then do a full test of sourcetype for each of the remaining potential matches.
| join max=0 sourcetype [| inputlookup my_lookup_table.csv | rename Field_SourceType as sourcetype, Field_Substring as teststring | table sourcetype teststring | eval teststring=lower(teststring) ] | rename COMMENT as “change asterisks to % and add % at front and end of teststring, tehn test and stats it up” | rex mode=sed field=teststring “s/[*]/%/g s/^(.)/%1/g s/(.)$/1%/g” | where like(Raw,teststring) | stats count by sourcetype, teststring
By the way, sorry we missed your earlier question.
Source: https://t-tees.com
Category: WHICH
