If you process large volumes of data or perform memory-intensive transformations, you can use the 64-bit PowerCenter version to increase session performance. The 64-bit version provides a larger memory space that can significantly reduce or eliminate disk input/output.
This can improve session performance in the following areas:
With a 64-bit platform, the Integration Service is not limited to the 2 GB cache limit of a 32-bit platform.
With a larger available memory space, the reader, writer, and DTM threads can process larger blocks of data.