关闭数据库，alert日志：
Active call for process 36176016 user 'oracle' program 'oracle@aix'
Active call for process 23789646 user 'zed' program 'oracle@aix (TNS V1-V3)'
Active call for process 38011128 user 'oracle' program 'oracle@aix'
Active call for process 18481304 user 'zed' program 'oracle@aix (TNS V1-V3)'
Active call for process 23855274 user 'oracle' program 'oracle@aix'
Active call for process 12976232 user 'zed' program 'oracle@aix (TNS V1-V3)'
Active call for process 54722614 user 'oracle' program 'oracle@aix'
Active call for process 46924016 user 'oracle' program 'oracle@aix'
Active call for process 50135144 user 'zed' program 'oracle@aix (TNS V1-V3)'
Active call for process 49020980 user 'zed' program 'oracle@aix (TNS V1-V3)'
Active call for process 58196174 user 'oracle' program 'oracle@aix'
Active call for process 16580722 user 'oracle' program 'oracle@aix'
SHUTDOWN: waiting for active calls to complete.
Explanation:
============
The database is waiting for pmon to clean up processes, but pmon is unable to
clean them. The client connections to the server are causing the shutdown
immediate or normal to hang. Killing them allows pmon to clean up and release
the associated Oracle processes and resources.
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