Oracle 11g中SYS连接阻止关闭数据库
以前就发现11g的Oracle有这个问题，一直没有太在意，直到今天关闭数据库的时候发现很长时间Oracle都无法正常关闭。发现数据库可以
以前就发现11g的Oracle有这个问题，一直没有太在意，直到今天关闭数据库的时候发现很长时间Oracle都无法正常关闭。
从后台查询，发现数据库出现错误提示：
SHUTDOWN: Active processes prevent shutdown operation
检查数据库后台进程，未发现占用大量资源的连接，实际上整个数据库中只有一个本地连接：
bash-3.00$ ps -ef|grep oraclerac11g2
oracle 22273 22272 0 19:59:51 ? 0:00 oraclerac11g2 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
oracle 29307 22520 0 20:09:28 pts/2 0:00 grep oraclerac11g2
经过检查发现，似乎是由于当前的SYS连接没有退出，而直接通过HOST命令启动了另一个sqlplus命令，并在其中执行了shutdown immediate操作，，这时就会导致shutdown immediate被hang住：
$ sqlplus "/ as sysdba"
SQL*Plus: Release 11.1.0.6.0 - Production on 星期五 8月 22 19:49:35 2008
Copyright (c) 1982, 2007, Oracle. All rights reserved.
连接到:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
SQL> shutdown immediate数据库已经关闭。已经卸载数据库。
ORACLE 例程已经关闭。
SQL> startup
ORACLE 例程已经启动。
Total System Global Area 1.7108E+10 bytes
Fixed Size 2101632 bytes
Variable Size 3344420480 bytes
Database Buffers 1.3757E+10 bytes
Redo Buffers 4431872 bytes数据库装载完毕。数据库已经打开。
下面启动另一个会话，并以SYS登陆数据库，然后尝试关闭数据库：
SQL> shutdown immediate数据库已经关闭。已经卸载数据库。
ORACLE 例程已经关闭。
发现数据库可以正常关闭，然后根据刚才的描述，在sqlplus中切换到主机命令行，然后再新启动一个sqlplus，执行shutdown immediate：
SQL> startup
ORACLE 例程已经启动。
Total System Global Area 1.7108E+10 bytes
Fixed Size 2101632 bytes
Variable Size 3344420480 bytes
Database Buffers 1.3757E+10 bytes
Redo Buffers 4431872 bytes数据库装载完毕。数据库已经打开。
SQL> select count(*) from v$session;
COUNT(*)
----------
36
SQL> host
$ sqlplus "/ as sysdba"
SQL*Plus: Release 11.1.0.6.0 - Production on 星期五 8月 22 19:59:51 2008
Copyright (c) 1982, 2007, Oracle. All rights reserved.
连接到:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
SQL> shutdown immediate
和预期的一样，关闭命令被hang住了，检查alert文件就可以看到上面的提示信息。
退出当前的会话，回到原始会话，并重新连接，就可以正常的关闭数据库了：
SQL> shutdown immediate
^CORA-01013: 用户请求取消当前的操作
SQL> exit从 Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options 断开
$ exit
SQL> shutdown immediate
ORA-03135: 连接失去联系
SQL> conn / as sysdba已连接。
SQL> shutdown immediate数据库已经关闭。已经卸载数据库。
ORACLE 例程已经关闭。
而920版本的数据库是没有这个问题的：
[oracle@bjtest ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on 星期六 8月 23 04:14:36 2008
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
已连接到空闲例程。
SQL> host
[oracle@bjtest ~]$ ps -ef|grep ora
root 3804 3792 0 Jul18 ? 00:00:29 hald-addon-storage: polling /dev/hda
root 26417 26385 0 04:14 pts/1 00:00:00 su - oracle
oracle 26418 26417 0 04:14 pts/1 00:00:00 -bash
oracle 26451 26418 0 04:14 pts/1 00:00:00 sqlplus
oracle 26452 26451 0 04:14 ? 00:00:00 oraclebjtest (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
oracle 26453 26451 0 04:14 pts/1 00:00:00 /bin/bash
oracle 26481 26453 0 04:14 pts/1 00:00:00 ps -ef
oracle 26482 26453 0 04:14 pts/1 00:00:00 grep ora
[oracle@bjtest ~]$ exit
exit
SQL> startup
ORACLE 例程已经启动。
Total System Global Area 9415145752 bytes
Fixed Size 755992 bytes
Variable Size 822083584 bytes
Database Buffers 8589934592 bytes
Redo Buffers 2371584 bytes数据库装载完毕。数据库已经打开。
SQL> host
[oracle@bjtest ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on 星期六 8月 23 04:15:08 2008
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
连接到:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
SQL> shutdown immediate数据库已经关闭。已经卸载数据库。
ORACLE 例程已经关闭。
SQL> exit从Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production中断开
[oracle@bjtest ~]$ exit
exit
SQL> exit
ERROR:
ORA-03113: 通信通道的文件结束
从Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production(情况复杂)中断开
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