I was wondering if you could help me with a dilemma about PERFORMANCE.
I'm normalizing fields in order to use them with Splunk Common Information Model (CIM) and I don't know if using the extraction method like this:
REPORT-rule_as_rule_id = rule_as_rule_id
REGEX = rule=(\w+)
FORMAT = rule_id::$1
OR just use the FIELDALIAS like this:
FIELDALIAS-opsec_cim_fields = rule_id as rule_id
Can you help me to understand what is the best method, if any?
Thank you in advance!
Field-aliases can be a bigger determent to performance. Martinmueller (https://answers.splunk.com/users/134323/martinmueller.html) could probably answer this better than I can with his fantastic .conf talk on the subject: http://conf.splunk.com/session/2015/conf2015_MMueller_Consist_Deploying_OptimizingSplunkKnowledge.pd...
My take-away is - I wouldn't spend a whole lot of time fixing existing sourcetypes, but if you're doing it for a new sourcetype then i'd utilize a regex.
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Thank you for your answer! I'll try this approach.