Difference between BW statistcs for a cube and for overall system

Hai all,
We have a BW system with a process chain for Bw statistics for the whole system. I made a process chain with DB statistics for one my cube. I am sorry. I have little knowledge of the statistics.
My question is would be useful to have statistics for the whole system or perhaps a BW statistics cube
or
Constructing DB statistics every time when cube is loaded?
Which one is advantageous and more recommended? I would appreciate if somebody could refer me to some kind of documentation on this topic.
Thank you very much.

I'm a little fuzzy on what statistics you are discussing.
There are Database statistics that are collected on the tables in your BW and there are 'BW Statistics" cubes that contain operational data about what goes on in your BW, how many queries have run, load times, compress times, etc.
It sounds to me like what you are describing is there is one Process Chain that is loading data to the BW Statistics cubes, and you created another chain that is collecting Database statistics.
This is just a guess on my part. What is loaded to the BW Statistics cube is completly different data used for different purposes than database statistics.
BW Statistics are loaded to InfoCubes that are named 0BWTC_C* . What Process Types are being used in these two Process Chains - that would clear this up.

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