As a best practice, increase PDI's memory limit so the Pentaho Server and the PDI client (Spoon) can perform memory-intensive tasks, process or sort large datasets and run complex transformations and jobs. You will need to increase the memory limit for both the Pentaho Server and the PDI client. If you choose not to increase the memory limit, PDI uses the default memory settings that are defined in your startup scripts.
Note: Instead of modifying the PDI client startup script,
you can also set the environment variable PENTAHO_DI_JAVA_OPTIONS equal to
-Xmx2g -XX:MaxPermSize=256m on your client.