Use the information in this section to help troubleshoot caching for an Aggregator transformation.
The following warning appears when I use the cache calculator to calculate the cache size for an Aggregator transformation:
CMN_2019 Warning: The estimated data cache size assumes the number of aggregate functions equals the number of connected output-only ports. If there are more aggregate functions, increase the cache size to cache all data in memory.
You can use one or more aggregate functions in an Aggregator transformation. The cache calculator estimates the cache size when the output is based on one aggregate function. If you use multiple aggregate functions to determine a value for one output port, then you must increase the cache size.
Review the transformation statistics in the session log and tune the cache size for the Aggregator transformation in the session.
The following memory allocation error appears in the session log when I run a session with an aggregator cache size greater than 4 GB and the Integration Service process runs on a Hewlett Packard 64-bit machine with a PA RISC processor:
FATAL 8/17/2006 5:12:21 PM node01_havoc *********** FATAL ERROR : Failed to allocate memory (out of virtual memory). ***********
FATAL 8/17/2006 5:12:21 PM node01_havoc *********** FATAL ERROR : Aborting the DTM process due to memory allocation failure. ***********
By default, a 64-bit HP-UX machine with a PA RISC processor allocates up to 4 GB of memory for each process. If a session requires more than 4 GB of memory, increase the maximum data memory limit for the machine using the maxdsiz_64bit operating system variable. For more information about maxdsiz_64bit, see the following URL: