Splunk Search Condition != vs. NOT
NOTin Splunk search.
When you want to exclude results from your search you can use
NOT operator or the
!= field expression.
However there is a significant difference in the results that are returned from these two methods.
- Both!= field expression and NOT operator exclude events from your search, but produce different results
status != 200
- Returns events where status field exists and value in field doesn’t equal 200
NOT status = 200
- Returns events where status field exists and value in field doesn’t equal 200 – and all events where status field doesn’t exist
NOTever yield the same results?
- Yes, if you know the field you’re evaluating always exists in the data you’re searching
- For example:
index=web sourcetype=access_combined status!=200
index=web sourcetype=access_combined NOT status=200yields same results because
statusfield always exists in
Searching with != or NOT is not efficient
!= expression or
NOT operator to exclude events
from your search results is not an efficient method of filtering events.
The execution cost for a search is actually less when you explicitly
specify the values that you want to include in the search results.
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