SAP Data Archiving

I have question on Archiving Statistics.
I get some statistical information in the spool file of the archive run. And also I can see some additional statistical information when clicked on the "Statistics" button under the SARA transaction.
I am trying to understand the relation, primarily, among:
1) Size of Archiving Session in MB
2) Occupied Database space in MB
3) Deleted Database space in MB
Which of these numbers or a combination would reflect the actual disk space emptied by the Archiving run from Database?
This information is critical for the upper management.
Your help is highly appreciated.
Regards,
Srinivasa

Hi Juan,
Appreciate your inputs. Even though the performance improvements is the primary objective for implementing archiving, containing the data growth as well is an objective. I am not sure if there are any methodoligies to quantify the performance improvements resulting from archiving. Currently I am concerned about quantifying the containment of data growth as a result of archiving.
I have been also looking at documentation on archiving statistics. SAP says data archiving does a 5:1 compression for non-cluster tables, and no further compression for cluster tables.
When SAP is providing the statistical information (from the spool file of an archive session and also the "Statistics" button under the SARA transaction), I believe that should be CORRECT. And I am confused as to what the numbers in the statistics really reflect.
Here are the numbers from a production run of CO_ML_IDX (which archives data from CKMI1 table):
From the spool file the numbers are:
Size of Archiving Session in MB   -    700.900
Occupied Database Space in MB     - 10,827.569
From the statistics display the numbers are:
Disk Space         -   700.9
DB Space (Write)   - 10827.57
DB Space (delete) -     0
Did this archive run free up 3504.5 MB (which is 5*700.9)
or 10827.57 MB (the DB Space written)? Should the "DB Space (Delete)" not reflect the space deleted from the database? If so it should have some non zero value.
How are these three values related to actual disk space freed up in the database as a result of this archive run?
Appreciate for sharing your findings.
Regards,
Srinivasa

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what is data archiving and DMS(Data Management System) in SAP
Welcome to SCN. Before posting questions please search for available information here and in the web. Please also read the Rules of Engagement before further posting.
Edited by: kishan P on Aug 31, 2010 1:06 PM

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