To increase session performance, sort data for the Aggregator transformation. Use the Sorted Input option to sort data.
The Sorted Input option decreases the use of aggregate caches. When you use the Sorted Input option, the Integration Service assumes all data is sorted by group. As the Integration Service reads rows for a group, it performs aggregate calculations. When necessary, it stores group information in memory.
The Sorted Input option reduces the amount of data cached during the session and improves performance. Use this option with the Source Qualifier Number of Sorted Ports option or a Sorter transformation to pass sorted data to the Aggregator transformation.
You can increase performance when you use the Sorted Input option in sessions with multiple partitions.