Database Shutdown normal -- Problem

Dear ALL;

I am facing the problem in normal database shutdown procedure.

Database 11.1.0.7.0

sqlplus / as sysdba

SYSDBA >shutdown ;

alert_BAK.log

Wed Dec 05 08:59:30 2012
Starting background process SMCO
Wed Dec 05 08:59:30 2012
SMCO started with pid=168, OS id=25947
Wed Dec 05 08:59:40 2012
Stopping background process SMCO
Stopping background process FBDA
Shutting down instance: further logons disabled
Wed Dec 05 08:59:42 2012
Stopping background process CJQ0
Stopping background process QMNC
Stopping background process MMNL
Stopping background process MMON
Shutting down instance (normal)
License high water mark = 142
Wed Dec 05 09:04:48 2012

Active process 25973 user 'backup' program 'oracle@prodbak.ata.com.pk'
Active process 25945 user 'backup' program 'oracle@prodbak.ata.com.pk'
Active process 25658 user 'backup' program