Performance tuning environment variables in DataStage
The following environment variables are recommended for performance tuning of a job flow.
- APT_BUFFER_MAXIMUM_MEMORY environment variable in DataStage
- APT_BUFFER_FREE_RUN environment variable in DataStage
- TMPDIR. This defaults to /tmp. It is used for miscellaneous internal temporary data, including FIFO queues and Transformer temporary storage. As a minor optimization, it can be better to ensure that it is set to a file system separate to the DataStage® install directory.