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Message Posted: Fri, 12 Nov 2010 @ 17:44:45 GMT


     
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Subj:   SI and load utilities
 
From:   Faible Mou

Hi,

I just want to know the reason why load utilities ( FastLoad / MultiLoad) do not allow the use of Secondary Indexes to enforce uniqueness (true at least until R2V5).

If my table has a NUPI but a USI, enclosed list is what will happen when USI is not honored by load utilities. Thus I want to know the reason behind the restriction -- no need for a thesis, but simple explanation would be enough for me.


Thanks

FM

                       Number of Rows
      Row Number        that must be         Cumulative Number
     to be inserted   logically read first   of logical row reads
              1                 0                         0
              2                 1                         1
              3                 2                         3
              4                 3                         6
              5                 4                        10
              6                 5                        15
              7                 6                        21
              8                 7                        28
              9                 8                        36
             10                 9                        45
             20                19                       190
             50                49                      1225
            100                99                      4950
            200               199                     19900
            500               499                    124750
           1000               999                    499500


     
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