Oracle 启动后发现其他帐户都无法登陆，报告错误如下：
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
登录服务器
Sqlplus /nolog
Connect / as sysdba
Startup
出现故障如下：
SQL> startup
ORACLE instance started.
Total System Global Area 1224736768 bytes
Fixed Size 778876 bytes
Variable Size 652483972 bytes
Database Buffers 570425344 bytes
Redo Buffers 1048576 bytes
ORA-01102: cannot mount database in EXCLUSIVE mode
大意是 “Oracle被异常关闭时，有资源没有被释放……”
检查警告日志，也证实了这一点，系统异常
解决：
察看报警日至文件：错误如下：
LTER DATABASE MOUNT
Mon Apr 12 13:57:29 2010
scumnt: failed to lock /data/oracle/product/10.1.0/db_1/dbs/lkMUSICDB1 exclusive
Mon Apr 12 13:57:29 2010
ORA-09968: scumnt: unable to lock file
Linux Error: 11: Resource temporarily unavailable
Additional information: 1728
Mon Apr 12 13:57:29 2010
ORA-1102 signalled during: ALTER DATABASE MOUNT...
2。解决方法
察看此目录
Cd $ORACLE_HOME/dbs
发现此目录下有 lk(SID) 文件存在
/sbin/fuser -u lkMUSICDB1
lkMUSICDB1: 1724(oracle) 1726(oracle) 1728(oracle) 1730(oracle) 1732(oracle) 1736(oracle) 1738(oracle) 1741(oracle) 1840(oracle) 1968(oracle) 1970(oracle) 1995(oracle) 1997(oracle) 2910(oracle) 2912(oracle) 2914(oracle) 2916(oracle) 2918(oracle) 3198(oracle) 3263(oracle)
杀掉先
/sbin/fuser -k lkMUSICDB1
再查，发现已经没有资源占用
/sbin/fuser -u lkMUSICDB1
ok！
再次启动Oracle
SQL> connect / as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 1224736768 bytes
Fixed Size 778876 bytes
Variable Size 652483972 bytes
Database Buffers 570425344 bytes
Redo Buffers 1048576 bytes
Database mounted.
Database opened.