Group source processing in PowerExchange reads data stored in the same physical source in a single pass, which enhances throughput and reduces resource consumption by eliminating multiple passes of the source data.

For an IMS unload data source, you can use Designer to import a data map with multiple record types to create a PowerCenter source definition. If you want the source definition to represent only a single record type, import a single table from the data map. If you want the source definition to include all record types, import the data map as a multi-record data map.

When you run a session that contains a mapping with source definitions for each table in a multi-record data map, PowerExchange reads the data set or file once for each source definition. When you run a session that contains a mapping with a single source definition for all records in a multi-record data map, PowerExchange uses group source processing to read all of the records in the data set or file in a single pass.

For more information, see

PowerExchange Interfaces for PowerCenter

.