Delta and logycal system name

Question

Hi!
I have two identical BW systems: one is a copy another system.
BW1 - original system.
BW2 - copy.
We need 10 days to convert BW2 to UNICODE. During these 10 days datas are loaded from SAP ERP to original system, BW1.
After we convert BW2 to UNICODE we need to load delta-data(which we loaded to BW1 during 10 days) from BW1 to BW2.
How can we do it? We can't stop to load data during 10 days.
I want to create RFC-connection between BW1 and BW2, then replicate data sources, create transformations and DTPs between the same objects (cube or DSO). But how I can find out this delta?
For example, I have two cubes, one cube1 is from BW1, cube1 is from BW2. There are 5 requests in cube1, and 3 requests in cube2. I know that two last requests from cube1 I need to load to cube2, but in DTP I can't choose request filter.
Any idea?
I have another problem: these BW systems have identical logical system name. In future I would delete BW1 and use BW2.
If I rename logical system name of BW2 then I will destroy delta loadings from SAP ERP, because delta is depended on BW logical name.

Answer 1

Hello KEU,
I understand your issue like below:
1. BW1 & BW2 is non-unicode at present. BW2 is a copy of BW1 and hence BW2 objects also non-unicode and you want to migrate all the data and objects into Unicode at present.
2. BW1 is connected to the ECC and you need to dump all the Delta data for the 10 days of period to be posted into BW2 so that you can connect BW2 to ECC once BW1 is retired after the Unicode migration.
You have the below possibilities..
1. Connect BW1 and BW2 thru RFC and create a BW1 source system in BW2. Now you need to replicate all data sources from BW1 source system in BW2. Create required transformations which are necessary to connect to the required targets.
2. To load the Delta data you need a right strategy so that dont miss any of the information from BW1 to BW2. I can say as you are in BI7.0 you have the PSA to store all the data in all the trasactional targets where you are looking to move the data.
  - For me you have to take care of this once after the copy is done -
Maintain the connection as stated earlier, create the neceaary transformation, and then you need to maintain the init without data transfer in BW2 for the required data sources  (8**) so that the Delta data can be pusched from there onwards. So this is required for all the data flows with respect to the individual targets where are getting oprated with DELTA loads...
-- If you have missed then the other option is that, make sure that in BW1 the data is updated in the targets as per the data flow like target 1 to final targets (considering there is no compression), as you have the PSA's for all the data flows, you need to delete the entries which are made after the system copy is done, so that BW1 and BW2 are at the same level, once after this initi without data transfer needs to be done in BW2. Once this is done you need to reconstruct all the deleted entries in the total flow so that there will not be any data mart symbol exisits so that it can be pushed in the Delta load in BW2.  (This operation needs to be handled carefully. If not clear then its not suggestable). Also once the Delta loads are moved to BW2, then you need to work in BW1 to maintain the proper Init status.
3. The final option is to get the 10 days of Data in a flat file from different targets in BW1 and then maintain a right strategy to load the same in the respective targets in BW2. Needs proper attention.
So handle the points carefully as its a complex situation.
Hope this helps..
Murali
Edited by: Murali M on Aug 29, 2010 9:10 AM