Fixing on Accounts DIM for aggregation

Question

Please Take a look at the following code
FIX("Sales")
AGG("Products");
ENDFIX
Since we are fixing on a dense Dim i.e. Accounts ,will this code run an Aggregation for all the Accounts members?
If yes then given a situation where we want to aggregate products for only a single account member ,how do we achieve that?

Answer 1

Yes, technically you are bringing all members of the dense dim into memory. This is only relevant in terms of optimization. For instance let's say you wanted to aggregate Product Dim for Sales and COGS. It would be inefficient to do the following
FIX("Sales")
AGG("Product");
ENDFIX
FIX("COGS")
AGG("Product");
ENDFIX
In this case you are bringing the block into memory, aggregating, then taking out of memory, only to bring it right back in again. It would be more efficient to do the following
FIX("Sales", "COGS")
AGG("Product");
ENDFIX
Now you are taking advantage of the fact that both measures are in memory and calculating them at the same time.
This is irrelevant however if your requirement is to only aggregate Sales. If that is your requirement, then that is what you need to do. Just keep in mind and watch for opportunities to make your calcs more efficient by minimizing passes on the database when you can.