Specifies the number of threads that the Data Integration Service tries to create for the current transformation at run time. The Data Integration Service considers the Execution Instances value if you override the Maximum Parallelism run-time property on the mapping that contains the transformation. The default Execution Instances value is 1.
The Data Integration Service considers multiple factors to determine the number of threads to assign to the transformation. The principal factors are the Execution Instances value and the values on the mapping and on the associated application services in the domain.
The Data Integration Service reads the following values when it calculates the number of threads to use for the transformation:
The
Maximum Parallelism
value on the Data Integration Service. Default is 1.
Any
Maximum Parallelism
value that you set at the mapping level. Default is Auto.
The
Execution Instances
value on the transformation. Default is 1.
If you override the Maximum Parallelism value at the mapping level, the Data Integration Service attempts to use the lowest value across the properties to determine the number of threads.
If you use the default Maximum Parallelism value at the mapping level, the Data Integration Service ignores the Execution Instances value.
The Data Integration Service also considers the
Max Address Object Count
property on the Content Management Service when it calculates the number of threads to create. The
Max Address Object Count
property determines the maximum number of address validation instances that can run concurrently in a mapping. The
Max Address Object Count
property value must be greater than or equal to the
Maximum Parallelism
value on the Data Integration Service.
Rules and Guidelines for the Execution Instances Property
Consider the following rules and guidelines when you set the number of execution instances:
Multiple users might run concurrent mappings on a Data Integration Service. To calculate the correct number of threads, divide the number of central processing units that the service can access by the number of concurrent mappings.
In PowerCenter, the
AD50.cfg
configuration file specifies the maximum number of address validation instances that can run concurrently in a mapping.
When you use the default Execution Instances value and the default Maximum Parallelism values, the transformation operations are not partitionable.
When you set an Execution Instances value greater than 1, you change the Address Validator transformation from a passive transformation to an active transformation.
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