Why MultiLoad Utility supports only Non Unique Secondary
Index(NUSI) in the Target Table ?
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Answer Posted / madhu
Like FastLoad, MultiLoad does not support Unique Secondary
Indexes (USIs). But unlike FastLoad, it does support the
use of Non-Unique Secondary Indexes (NUSIs) because the
index subtable row is on the same AMP as the data row.
MultiLoad uses every AMP independently and in parallel. If
two AMPs must communicate, they are not independent.
Therefore, a NUSI (same AMP) is fine, but a USI (different
AMP) is not.
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