17.10 - Transient Journaling - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
Language
English (United States)

The transient journal is a system-maintained dictionary table that provides a way to protect transactions from various system failures and from deadlock (see Teradata Vantage™ - SQL Request and Transaction Processing, B035-1142 for a description of deadlock). Each transaction processed by Vantage records a before change image of rows that are touched by the transaction. Then if a transaction fails for some reason, the before change image of any modified rows can be retrieved from the transient journal and written over the modifications, returning the row to the same state it was in before the transaction occurred. Vantage removes all before change images from the transient journal after a transaction commits.