Index Maintenance During Mini-Batch Processing - comment by carrie

Hi Raja,
 
You can certainly use the HASH BY COLUMN or HASH BY RANDOM options, if you are on 14.0.  They work on any NOPI table (column-partitioned or not), but not on tables that have a primary index.   You cannot use the HASH BY clause on an INSERT into a table with a primary index or primary AMP index since that would conflict with the distribution required by the index.
 
I can't tell you which will perform better, fastload or insert/select, you would need to test that out with your data.  If the table being loaded is a column-partitioned table, you cannot use fastload against it, only insert/select.
 
Thanks, -Carrie