Disk I/O environment variables in DataStage

These environment variables are concerned with when and how DataStage® parallel jobs write information to disk.

APT_BUFFER_DISK_WRITE_INCREMENT environment variable in DataStage
The APT_BUFFER_DISK_WRITE_INCREMENT environment variable controls the write to disk chunk size.
APT_EXPORT_FLUSH_COUNT environment variable in DataStage
The APT_EXPORT_FLUSH_COUNT environment variable controls how often the export operator flushes data to disk.
APT_IO_MAP/APT_IO_NOMAP and APT_BUFFERIO_MAP/APT_BUFFERIO_NOMAP environment variables in DataStage
These environment variables control memory-mapped I/O.
APT_PHYSICAL_DATASET_BLOCK_SIZE environment variable in DataStage
The APT_PHYSICAL_DATASET_BLOCK_SIZE environment variable specifies the block size to use for reading and writing to a data set stage.

Parent topic: Environment variables in DataStage