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Teradata - Why Multiload does not supports USI and supports NUSI?




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asked mar September 20, 2014 06:37 AM  

Why Multiload does not supports USI and supports NUSI?


           

1 Answers



 
answered By vishnoiprem   0  
MulitLoad has support for Non-Unique Secondary Indexes (NUSIs) since NUSIs are AMP Local.

Index subtable row is on the same Amp as the data row in NUSI.so it operates each Amp independently and in parallel.

If you go with USI, it has hash bucket, which might redirect to another amp, more possibilities for full table scan.
Motive for avoiding Indexes(other thn NUSI): Avoid Full table scan.
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