Determining Space Information (Oracle) 
Use
You can determine information about space and space parameters online or use existing statistics.
Procedure
Intermediate result
Online space
provides you with information obtained from the Oracle system table DBA_TABLES. This includes the number of records, the space used, and the date the last time statistics were created by Oracle. The system also displays general information about the time and the number of the last archiving session as well as its client–dependence.Space statistics displays the corresponding information from the SAP tables DBSTATTORA and DBSTATIORA that are filled using statistic determining sessions ( sapdba -analyze ).
See CCMS Support for the Cost-Based Optimizer
If you want more details about the space and space parameters of a particular table, do the following:
Result
You can use the information displayed to determine what to archive. Choose Archive management to go to archive management directly, where you can plan and execute data archiving.