Search for	Example	Results
A single word	`cat`	Topics that contain the word "cat". You will also find its grammatical variations, such as "cats".
A phrase. You can specify that the search results contain a specific phrase.	`"cat food"` (quotation marks)	Topics that contain the literal phrase "cat food" and all its grammatical variations. Without the quotation marks, the query is equivalent to specifying an OR operator, which finds topics with one of the individual words instead of the phrase.

Search for	Operator	Example
Two or more words in the same topic	`AND` `and` `+` (plus symbol) `&` (ampersand)	`cat AND dog` `"cat food"+milk` `"cat food"&"dog food"`
Either word in a topic	`OR` `or` `\|` (pipe)	`cat OR dog` `cat \| dog`
Topics that do not contain a specific word or phrase	`NOT` `not` `!` (exclamation point)	`NOT cat` `! dog`
Topics that contain one string and do not contain another	`^` (caret)	`cat ^ mouse`
A combination of search types	`( )` parentheses	`cat + (dog \| mouse)` `cat \| dog + (! mouse)`

Service Manager9.52

Administer > System configuration parameters > Information retrieval (IR) expert parameters > ir_minidf

Information Retrieval (IR) expert parameters: ir_minidf

Parameter

ir_minidf

Description

This parameter defines the minimum relevance ranking that search terms must have for HPE Service Manager to include them in Information Retrieval (IR) search results. Service Manager ranks each search term based on how frequently it appears in the index. Terms that appear in the index less frequently are assigned more relevance in search results. If a term appears in the index too frequently, Service Manager ignores the search term as if it were in the stop word list.

Service Manager determines a relevance ranking for each search term by computing an IDF value. Service Manager uses the following formula to compute the IDF value of search terms: [natural log (terms in index/number of instances of search term in index)]+1

For example, in an index of 1000 terms, a search term that appears 250 times in the index has an IDF value of 2.4. Since this is below the minimum value of 2.5, Service Manager ignores the term because it appears too frequently. A search term that appears only 10 times in the index however has an IDF value of 5.6, and since this term exceeds the minimum IDF value threshold, Service Manager includes it in the search results.

Valid if set from

Server's operating system command prompt

Initialization file (sm.ini)

Requires restart of the Service Manager server?

Yes

Default value

2.5

Possible values

Minimum IDF value

Example usage

Command line: sm -httpPort:13080 -ir_minidf:2.4

Initialization file: ir_minidf:2.4

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