Solution : https://service.sap.com/sap/support/notes/719581 (SAP Service marketplace login required)
Key words : 
summary log arch<dbsid>, log increases constantly, terms br tools, summary log, arch<dbsid>, brarchive reason, advance development, system deletes, threshold values 400, downloading patches
Related Notes : 
       
| 680046 | Corrections in BR*Tools Version 6.40 | 
| 514205 | Corrections in BR*Tools version 6.20 | 
| 403706 | Corrections in BR*Tools Version 6.10 |