Why MultiLoad Utility supports only Non Unique Secondary
Index(NUSI) in the Target Table ?
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Answer Posted / satya
whenever we define a SI an SI subtable is created in each
AMP.For USI they go for a hash distribution, and hence the
actual data row pointed by the USI subtable rows in one AMP
may not be in the same AMP as the subtable..so the AMPs
have to communicate, which is not supported by Multiload.
For NUSI the subtable will store references of only those
actual data rows who exist in the same AMP as the
subtable..they all point to the data in their own
AMP..hence AMPs dont need to communicate here.
Thus the AMPs work in parallal with NUSI and hence Mload
supports that.
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