17.05 - ROLLBACK Is Explicit - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)

There are no implicit transactions in ANSI session mode. More accurately, each ANSI transaction is initiated implicitly, but always completed explicitly. A COMMIT or ABORT/ROLLBACK request must always be explicitly stated and be the last request of a transaction in order for the transaction to terminate successfully.

In ANSI session mode, you must issue an ABORT/ROLLBACK (or COMMIT) request even when the only request in a transaction is a SELECT or SELECT AND CONSUME.

For a SELECT request, there is no difference between issuing a COMMIT or an ABORT/ROLLBACK.

For a SELECT AND CONSUME, there is a difference in the outcomes between issuing a COMMIT or ABORT/ROLLBACK because an ABORT or ROLLBACK request reinstates the subject queue table of the request to its former status, containing the rows that were pseudo-consumed by the aborted SELECT AND CONSUME request.