17.10 - Parent and Child Sessions - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Database Utilities

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Configuration
Publication ID
B035-1102-171K
Language
English (United States)

When a connected session is part of either a FastLoad, MultiLoad, or FastExport operation, that session establishes subordinate sessions to accomplish the task more quickly. The originating session is then called a Parent session; the subordinate sessions are called Child sessions that belong to that Parent.

A Child session is not recognized as such, and its activity is not reported until it has transmitted at least one request to the AMPs in the current transaction.

Information about the activity of Child sessions is available to Query Session when the Parent session is in the Active state or when one of several inactive states described later.

In FastLoad operations, Child sessions exist and are reported only while the Parent session is in the loading phase. In MultiLoad operations, Child sessions exist and are reported only while the Parent session is in the acquisition phase. Query Session reports the status of Child sessions when you request detail information.