16.20 - Multiple Sessions Example - Teradata Tools and Utilities

Teradata® Call-Level Interface Version 2 Reference for Mainframe-Attached Systems

Teradata Tools and Utilities
September 2019
Programming Reference

Each horizontal item that follows represents a call to DBCHCL with the function code set as in the left column.

Function Description
Connect/Fetch Same as for a single session
Initiate Request (Session 1)

Send Teradata SQL request to the Teradata Database.

Application must set address and length of Teradata SQL request and optional using data. Application must save the Output-CLIv2-request-number.

Initiate Request (Session 2) Same as for session 1, probably with different data
Fetch (Session 1 and 2) Same as for a single session:
  • set Input-CLIv2-connection-number to the number of the session to be used
  • set Input-CLIv2-request-number to the number of the request to be accessed
End Request Clean up request-related context (Stream 1 and 2)
Disconnect (for each session) Log off from the Teradata Database and free the session-related control blocks