![]() For more tips on search optimization, see Quick tips for optimization. The execution cost for a search is actually less when you explicitly specify the values that you want to include in the search results. Using the != expression or NOT operator to exclude events from your search results is not an efficient method of filtering events. Remove duplicate search results with the same host value. Remove duplicate results based on one field. To learn more about the dedup command, see How the dedup command works. Searching with != or NOT is not efficient The following are examples for using the SPL2 dedup command. If you use regular expressions in conjunction with != in searches, see regex. If you search for a Location that does not exist using NOT operator, all of the events are returned. Source="Ponies.csv" NOT Location="Calaveras Farms" ID This includes events that do not have a Location value. This allow the comment to be inserted anywhere in the search where it will always be expanded into the empty string (without quotes). comment (1) iseval1 definition'' argstext descriptionThrow away comment text. This includes events that do not have a value in the field.įor example, if you search using NOT Location="Calaveras Farms", every event is returned except the events that contain the value "Calaveras Farms". A macro with the following definition would be the best option. ![]() If you search with the NOT operator, every event is returned except the events that contain the value you specify. If you search for a Location that does not exist using the != expression, all of the events that have a Location value are returned. Source="Ponies.csv" Location!="Calaveras Farms" ID Events that do not have Location value are not included in the results. The difference between the regex and rex commands. This is a place to discuss all things outside of Splunk, its products, and its use cases. Events that do not have a value in the field are not included in the results.įor example, if you search for Location!="Calaveras Farms", events that do not have Calaveras Farms as the Location are returned. For general information about regular expressions, see About Splunk regular expressions in the Knowledge Manager Manual. If you search with the != expression, every event that has a value in the field, where that value does not match the value you specify, is returned. As you can see, some events have missing values. However there is a significant difference in the results that are returned from these two methods. When you want to exclude results from your search you can use the NOT operator or the != field expression.
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