来源于：
How to Kill a Session on RAC Database In Instance Independent Fashion. (文档 ID 869777.1)
适用于：
Oracle Database - Enterprise Edition - Version 11.1.0.6 and later
Information in this document applies to any platform.
目标：
你可以在RAC database中来kill session，而不用斟酌该session是从哪一个intance上产生的。这是11g的新特性。
解决方案：
To kill a session in RAC database use the following syntax.
sql> conn / as sysdba
sql> alter system kill session 'sid, serial#, @inst_id';
For Example :
SQL@racdb1> select inst_id,sid,serial#,username from gv$session where username is not null and username not like 'SYS%';
INST_ID SID SERIAL# USERNAME
---------- ---------- ---------- ------------------------------
1 123 76 DBSNMP
1 rows selected.
SQL@racdb2> conn scott/tiger
Connected.
SQL@racdb1> select inst_id,sid,serial#,username from gv$session where username is not null and username not like 'SYS%';
INST_ID SID SERIAL# USERNAME
---------- ---------- ---------- ------------------------------
2 115 17816 SCOTT
1 123 76 DBSNMP
2 rows selected.
SQL@racdb1> alter system kill session '115,17816,@2';
System altered.
SQL@racdb1> conn scott/tiger
Connected.
SQL@racdb1> select inst_id,sid,serial#,username from gv$session where username is not null and username not like 'SYS%';
INST_ID SID SERIAL# USERNAME
---------- ---------- ---------- ------------------------------
1 110 45316 SCOTT
1 123 76 DBSNMP
2 rows selected.
sql> alter system kill session '110,45316,@1';
System altered.