Teradata Hot Standby Node Explained

Roland Wenzlofsky

December 6, 2019

minutes reading time

A hot standby node is a member of a group of nodes (clique), and no virtual processes are running on it (AMPs, Parsing Engines).

The hot standby node waits for its mission, which occurs when a node crashes out of its clique.

Then all the AMPs of the crashed node are immediately migrated to the hot standby node. This happens practically without any loss of performance:

Teradata Hot Standby Node Explained 1
Node crashes, migration of AMPs takes place

The smart thing about the design is the following: As soon as the crashed node is online again, it becomes the new hot standby node:

Teradata Hot Standby Node Explained 2
The recovered node becomes the new HSN
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