Solution : https://service.sap.com/sap/support/notes/904662 (SAP Service marketplace login required)
Key words : 
work process hang directly, terms oracle windows 2003 64-bit, - increased system load solution, prerequisites - oracle database release 9, software release mentioned, production operation stable, increased load, oracle database, higher- windows 2003, partners oracle
Related Notes : 
       
| 908727 | Oracle 9 hangs on Windows 2003 64-bit and Service Pack 1 | 
| 521264 | Hang situations |