16.10 - Sequencer Process - Teradata Unity

Teradata Unity User Guide

Product
Teradata Unity
Release Number
16.10
Published
January 2018
Language
English (United States)
Last Update
2018-03-29
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For high availability setups, Unity has two sequencers. Only one sequencer is active at a time, serving lock requests to endpoints and processing incoming SQL statements. The active sequencer tracks the state of all systems and tables.

The other sequencer is on standby and takes over if the active sequencer fails.

For managed routing sessions, all incoming requests must go to through the active sequencer to determine the state of the objects the sequencer is accessing.