17.10 - Data Flow with Load and Unload Utilities - Access Module

Teradata® Tools and Utilities Access Module Reference

Access Module
Release Number
October 2021
English (United States)
Last Update

The following figure shows how the Teradata Named Pipes Access Module works with client load and unload utilities.

Data Flow Between Named Pipes and Load/Unload Utilities

A writer process writes an input data stream to a specified pipe either directly or through the Teradata Data Connector API. In response to requests from a reader process, the Teradata Access Module for Named Pipes does the following:
  • Reads the data from the specified pipe
  • Copies it to the fallback data file
  • Submits it to the reader process

The Teradata Access Module for Named Pipes can also read data from an ordinary file or from a file descriptor file system device on UNIX systems. However, using the module with an ordinary file is not recommended and does not yield the same performance as using a flat file without the access module.

The Teradata Access Module for Named Pipes supports only read operations from a named pipe. You cannot use the Teradata Access Module for Named Pipes to write to a pipe. Additionally, the access module is a block data transfer module; it is neither data-type nor record sensitive.