Hi Karthik,
Database growth/size is not DB related, but more related to applications which are writing to the tables and causing the growth. To view top growth objects, call the transaction DBAcockpit ->space - history
->tables and indexes, you will get a pop up. put in *,* to choose all then sort by growth. In the main window you can choose by day, week, month. You will see the top tables which are growing. Then check if the last reorgchk was recent. If not you may need to check that the reorg check job is sceduled every Sunday to run.
A useful note in SAP is
Note 706478 - Preventing Basis tables from increasing considerably
Regards,
Hugo