Selection criteria order
When Data Optimizer evaluates an open request, it determines how to process it based on the selection sources described in Selection processing. In some cases, the specifications of one selection source overrides those of another.
Data Optimizer uses the following selection hierarchy to determine which selection criteria and performance options apply:
DD override statements
User Control exit
Data policy definition
You can use this hierarchy to supply selection criteria and performance options from several sources. For example, a data policy definition could indicate inclusion for all data sets in a job along with various options, and a DD override statement could be supplied to exclude performance processing for a specific DD statement.
The following figure illustrates the selection criteria hierarchy.
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