By default, the

mapping

task determines the cache size at run time. Before starting the sort operation, the

mapping

task allocates the amount of memory configured for the Sorter cache size.

Configure the Sorter cache size with a value less than the amount of available physical RAM on the machine that hosts the Secure Agent. Allocate at least 16 MB (16,777,216 bytes) of physical memory to sort data with a Sorter transformation. When you allocate memory to the Sorter cache, consider other transformations in the mapping and the volume of data in the

mapping

task.

If the amount of incoming data is greater than the Sorter cache size, the

mapping

task temporarily stores data in the work directory. When storing data in the Sorter transformation work directory, the

mapping

task requires disk space of at least twice the amount of incoming data.

When you configure the tracing level to Normal, the

mapping

task writes the memory amount that the Sorter transformation uses to the session log.