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You need to load all data from QVDs into the front end everytime.
If the QVD load is optimised then this should not be too big an overhead.
It's the refreshing of the monthly QVD that you will want to avoid doing too often.
It is likely that the load of the monthly QVD is not optimised.
Ensure that any manipulation of the data is done when creating the QVD, not when loading from it. Ensure that the only WHERE statement is a single WHERE EXISTS on a field that is included in the load. Also ensure that if you are concatenating data that the table structure of the table you are concatenating to is identical to the one being concatenated.
If you post your load script I can take a look and see if I can spot where it is not optimised.
How big is the QVD that is being loaded?
Steve