If the session contains multiple partitions, you can configure the PowerCenter Integration Service to run one EIM task for all partitions or one EIM task for each partition. You might choose to invoke one EIM task for all partitions if the PowerCenter Integration Service uses the same IFB file to load all partitions. You might choose to invoke one EIM task for each partition if the PowerCenter Integration Service uses a different IFB file to load each partition. If you choose to invoke one EIM task for all partitions, you can achieve better performance because the PowerCenter Integration Service sends only one request to the Siebel server to invoke the EIM task.

If you configure the session to invoke one EIM task for all partitions, the PowerCenter Integration Service invokes the EIM task only for the partition configured as master partition. The PowerCenter Integration Service sets the OUTPUT_STATUS of all other partitions to the same value as that of the OUTPUT_STATUS of the master partition.

When you configure the session to invoke an EIM task for each partition, the PowerCenter Integration Service invokes an EIM task for each partition based on the IFB file provided for that partition. For example, you assign batch numbers to data from multiple sources. You can partition the data based on the batch number, and then invoke different EIM tasks on each partition.