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select saddr,sid,serial#,paddr,username,status from v$session where username is not null;
alter system kill session‘195,169‘;
drop user emis cascade;
sqlplus/nolog
conn / as sysdba;
startup(shutdown immediate)
(启动侦听)lsnrctl start/stop
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原文地址：http://www.cnblogs.com/mingjing/p/4477747.html
