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Incremental load performance low on big table


I have a Qlikview application with incremental load (using primary key and field datetime on tables).

I have a data volume which become important : neat 350 000 000 lines on some table using incremental load.

My application must keep one year history, and load daily near 4 million of lines using incremental load.

Now I see that the incremental load seems as long as the full load which is not really interesting.

Could it be possible to optimize this?

I have though about to use a BIT field instead of datetime field for the incremental load. And set an index on the field on database table I load.

The process will be something like this, for a BIT field ToLoad on a table with incremental load used:

1-all updated/inserted lines in table -> the field ToLoad set to 1 on the lines

2-QlikView application refresh with incremental condition on field "ToLoad=True"

3-Field ToLoad set to 0 on all the table

Do you think it will works better? Or any better idea?

The datetime method has truly poor performance on huge data volume as even if you set an index on a datetime field it's not really increase performance (all the value are different, the index has as values as number of table lines).

Could you help me?