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

Develop > Tailoring Best Practice Guide > Database (RDBMS) mapping > Example: Re-mapping an array > Existing query performance

Existing array query performance

Suppose you make the following Service Manager expert search from the Search Interaction Records form.

assignment.groups="Application"

If you enable the sqldebug:1 parameter, you can see that Service Manager converts this query in the following SQL statement:

SELECT NAME, ASSIGNMENT_GROUPS FROM HPOPERATORM1 WHERE ASSIGNMENT_GROUPS='Application';

However, since the ASSIGNMENT_GROUPS column is in a character large object data type, the RDBMS cannot query the field directly. Instead, the RDBMS must forward each row to Service Manager for it to evaluate the contents of the array. Using the out-of-box data, this query returns all 18 sample incident rows.

18 rows forwarded to Service Manager for evaluation
Operator ID	Assignment Groups
CMS.Process	Application, Hardware, Network
Catherine.Campbell	Application, Network, Office Support (North America) SAP Support (North America)
...	Application, ...
Rachel.Boudreau	Application, E-mail / Webmail (North America), Network, SAP Support (North America)

Because of the inefficiency of this query, the system produces performance alert messages.

Partial File Scan for query involving fields {assignment.groups} (se.search.engine,select.records)

SQL Query incomplete because field (assignment.groups) in file (hpoperator) can not be used in an SQL query (se.search.engine,select.records)

Hit Ratio not achieved on file hpoperator and query (assignment.groups="Application"): Of 101 records checked so far, 94 did not match the query (display,show.rio)

A partial file scan has two adverse performance impacts on your system:

The RDBMS uses network traffic to send rows to Service Manager
Service Manager must search within the array of each row the RDBMS forwards to it
The hit ratio can be low for such queries

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