Need help for deleting XI message performance header

Question

Hi,
In our production system, we are sheduling job SAP_XMB_PERF_REORG to removes all XI message performance headers (as per SAP note 820622). In this job we are using report SXMS_PF_REORG. But when are trying to execute this report, it asks for some input parameter.
Can anybody gives us detailed information about these parameters? Below are the 5 input parameters.Also please let us know whether all these parameters are mandatory or optional.
1. Days Until Raw Data Deletion
2. Days Until Delete Aggregation
3. Block Size
4. Max Data Record No. per Select
5. Parallelization Level
Thanks & Regards,
Sari

Answer 1

per 5: With this parameter you can activate the built-in parallelizer. This one is deactivated per default and it was implemented for dealing with giant backlogs. If, for example, the reorganization did not run for quite some time and there are millions of data records remaining in the database, the parallizer is designed to deal with it. However, activating the parallelizer will put a high load to the database and it will also consume a large percentage of CPU resources.
What happens in detail is this:when running this report as batch job having the parallelizer deactivated the job will simply use it's own background work process. When activating the parallelizer this background work process starts up several parallel tasks running in dialog work processes. This is pretty important as entire message processing is done in dialog work processes. Consequnently a large number of parallel reorg tasks will speedup the reorganization, but it will also impact the overall performance of message processing.
Enter -1 to make the system default 1 active (meaning: degree of paralleization  = 1 = parallelizer off) or enter any value 2 .. 5 to activate the parallelizer and to run up to 5 reorg tasks in parallel.
As lined out above there is no need in the normal case for setting all these parameters explicitely. Simply run the report using the default -1.
In case you do want to use the parallelizer you should adjust the number of data records read per select (4.) to an accordingly. This number should at least be 10 times higher that the degree of parallelism (5.) multiplying by the block size (3.).
Example: you would like to run 4 reorg tasks in parallel and each task shall delete up to 6,000 records in one go.
Hence,
Max Data Record No. per Select >= 10 * 4 * 6,000 = 240,000
Here you might want to set Max Data Record No. per Select to 250,000.
Best regards,
Harald Keimer
XI Development Support
SAP AG, Walldorf