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

Teradata® Tools and Utilities Access Module Reference

Product
Access Module
Release Number
17.10
Published
October 2021
Language
English (United States)
Last Update
2021-11-02
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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.