Hi Manish,
Please refer the SAP note below for the steps that could be taken to address such ALERT ID 67 for *Table growth of Row Store tables*
After identifying the top 20 largest ROW Store tables the note suggests actions such as Housekeeping and moving large Application tables from Rowstore to Columnstore if applicable
http://service.sap.com/sap/support/notes/2050579
Hope it helps
Sunil