How to track BIA delta index merge and rebuild

Hi Gurus,
I have set up process chains which load the BIA delta index and full index rebuild in separate process chains.
Is there any way to check if BIA is behaving as desired? I know to check RSDDSTATTREX table.
Regards,
Anil

Not a reply from Guru..
But I put my thoughts in and here are few take aways for you ,which you may wish to have a look in to..
PS - BI Accelerator is quite a Virgin territory ..few documentations or persons worked with ..
You can execute some performance checks with tcode - RSRV to validate the same.
<b>BI Accelerator Performance Checks</b>
1)Size of Delta Index
If you have chosen delta mode for an index of a table, new data is not written to the main index but to the delta index. This can significantly improve performance during indexing. However, if the delta index is large, this can have a negative impact on performance when you execute queries. When the delta index reaches 10% of the main index, the system displays a warning.
The system performs a merge for the index in repair mode. The settings are retained.
2) Propose Delta Index for Indexes
It is useful to create a delta index for large indexes that are often updated with new data. New data is not written to the main index, but to the delta index. This can significantly improve the performance of indexing, since the system only performs the optimize step on the smaller set of data from the delta index. The data from the delta index is used at the runtime of the query.
The system determines proposals from the statistics data: Proposals are those indexes that received new data more than 10 times during the last 10 days. A prerequisite for these proposals is that the statistics for the InfoCube are switched on.
Data in the main index and delta index should be merged at regular intervals (see test Size of Delta Index).
In repair mode, the system sets the Has Delta Indexproperty for the proposed indexes. The delta index is created when the data is next loaded for this index.
3)Compare Size of Fact Tables with Fact Index
The system calculates the number of records in both fact tables (E and F tables) for the InfoCube and compares them with the number of records in the fact index of the BI accelerator index. If the number of records in the BI accelerator index is significantly greater than the number in the InfoCube (more than a 10% difference), you can improve query performance by rebuilding the BIA index.
The following circumstances can result in differences in the numbers of records:
○ The InfoCube was compressed after the BI accelerator index was built. Since the BI accelerator index is not compressed, it may contain more records than the InfoCube.
○ Requests were deleted from the InfoCube after the BI accelerator index was built. The requests are deleted from the BIA index in the package dimension only. The records in the fact index are therefore no longer referenced and no longer taken into account when the query is executed; however, they are not deleted.
http://help.sap.com/saphelp_nw2004s/helpdata/en/6b/cda64246c6c96ae10000000a155106/content.htm
Hope it Helps
Chetan
@CP..

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Now I have following questions:-
1.     Which cube is best candidate for rebuilding the index and which for delta index?
2.     Which step in process chain we should call a program to merge the delta index?
3.     Should we create a separate process chain to merge delta index after all the loads are finished or we should call in the existing process chain.
Please help.
Warm Regards,
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Hi Gurus,
                 We have some cubes for BIA. In most of the cases, cubes get full and delta loads from different info sources and in some cases we have to delete the prior requests from the cubes.
Now I have following questions:-
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How to track BIA delta index merge and rebuild

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