![]() You can use parentheses to group Boolean expressions. Search for any event that contains the string "error" and 404.Search for any event that contains the string "error" and does not contain the keyword 403.Without parenthesis, this search is processed as: When you specify values without parenthesis, this search is processed as: This is the same as specifying A=1 B=2 OR C=3 The following examples show how Splunk software processes Boolean expressions. The following table describes the order in which the Boolean expressions are evaluated. This includes the implied search command at the beginning of the search. ) Splunk will first execute the subsearch. The order in which the Splunk software evaluates Boolean expressions depends on whether you are using the expression with the search command or the where command. This will return a single event with a field named search and a value like ( ( qmaildelivery'8227046' AND qmailmsg'33565415' ) OR ( qmaildelivery'7947353' AND qmailmsg'33719121' ) OR. Searching for "access denied" will yield faster results than NOT "access granted". ![]() Inclusion is generally better than exclusion. To apply to multiple terms, you must enclose the terms in parenthesis. The NOT operator only applies to the term immediately following NOT. So unless you want to include it for clarity reasons, you should not need to specify the AND operator. ![]() The AND operator is always implied between terms, that is: web error is the same as web AND error. The Splunk search processing language (SPL) supports the Boolean operators: AND, OR, and NOT. ![]()
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