Overview |
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Tasks |
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Included with |
Tivoli Change Management administration |
What are phrases? |
In Tivoli Change Management, a rule definition
phrase consists of the following:
For example, the following phrase specifies all CHANGE table records where the Status_ID field contains the value completed: Change:Status_ID=completed Notice that when a definition phrase is displayed, it appears with a colon separating the table name and the attribute. Do not use a colon in the Value box. |
Constructing phrases | You can use the following operators to combine
single phrases and create a comprehensive rule phrase definition.
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Optimizing phrases |
When Tivoli Change Management evaluates a phrase
at run time, it uses the following logic:
Using this evaluation logic, you can optimize the definition of rule phrases which has a direct impact on run time performance. If you have a phrase that has multiple conditions with all And conjunctions, then by defining the condition that has the highest probability of evaluating to false on the left side of the phrase definition, you save the processing time that would otherwise be used to evaluate the additional conditions. For example, assume that:
However, if the rule phrase is defined to detect any of the above conditions, then the
ordering of the conditions is reversed. By defining the condition in the rule phrase first
that has the greatest likelihood of evaluating to true, you take advantage of early exit
logic. |