When I shutdown databse, I can see waiting for arctice calls to compleed in alert log.
Shutting down instance (immediate) Stopping background process SMCO Shutting down instance: further logons disabled Stopping background process QMNC Tue Apr 14 15:52:00 2015 Stopping background process CJQ0 Stopping background process MMNL Stopping background process MMON License high water mark = 181 Tue Apr 14 15:57:02 2015 Active call for process 7658 user 'oracle' program 'oracle@bakudbtstora1' SHUTDOWN: waiting for active calls to complete.
View OS top, find a process ID 7658 Oracle job is running. kill -9 15693 db or not stop. View oracle log, or before and kill job. SQL> shut immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. Total System Global Area 1.2831E+10 bytes Fixed Size 2171296 bytes Variable Size 4529856096 bytes Database Buffers 8254390272 bytes Redo Buffers 44785664 bytes Database mounted. Database opened.