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If a table has fallback defined, the fallback AMPs for a primary AMP are included in the range of AMPs that are defined for the contiguous map. In other words, both primary and fallback copies share the same contiguous map. In the initial software release for the MAPS feature (Teradata Database 16.10), fallback rows are not allowed to be placed on AMPs that are not included in the contiguous map where the primary rows are located.

 

However, fallback placement works a little differently when a table is moved to a single-AMP sparse map.

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