17.10 - Multiple Session Example - Call-Level Interface Version 2

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

Call-Level Interface Version 2
Release Number
October 2021
Last Update
Content Type
Programming Reference
Publication ID
English (United States)
Last Update

Each horizontal item in the following table 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.
A Connect and Fetch must be done for each session.
Initiate Request (Session 1) Send Teradata SQL request to the database. Application must set address and length of Teradata SQL request and optional using data. DBCHCL adds response parcel and sends request. Application must save the output request and output session identifiers.
Initiate Request (Session 2) Same as for session 1, probably with different data.
Fetch (Sessions 1 and 2) Same as for a single session:
  • Set DBCAREA. header. logsessid to id of session to be used.
  • Set DBCAREA input session id of session to be used.
  • Set DBCAREA input request id of request to be accessed.
End Request Clean up request-related context. (Stream 1 and 2)
Disconnect (for each session) Log off the database and free the session-related control blocks.