oracle@db-server # ipcs -sa
IPC status from <running system> as of Sun Jul 19 22:01:09 CST 2009
T ID KEY MODE OWNER GROUP CREATOR CGROUP NSEMS OTIME CTIME
Semaphores:
s 851977 0x462fcb40 --ra-r----- orabil9 dbabil9 orabil9 dbabil9 604 22:07:58 12:54:47
s 1769482 0x6b997db0 --ra-r----- oracle9 dba9 oracle9 dba9 2004 22:07:15 17:03:39
s 1245195 0x8ea0d4d4 --ra-ra---- oracle dba oracle dba 2004 no-entry 19:27:06
接下来就可以通过操作系统的ipcrm命令来移除信号量集：
oracle@db-server # man ipcrm
NAME
ipcrm - remove a message queue, semaphore set or shared memory id
执行过程如下所示：
oracle@db-server # ipcrm -s 1245195
oracle@db-server # ipcs -sa
IPC status from <running system> as of Sun Jul 19 22:09:01 CST 2009
T ID KEY MODE OWNER GROUP CREATOR CGROUP NSEMS OTIME CTIME
Semaphores:
s 851977 0x462fcb40 --ra-r----- orabil9 dbabil9 orabil9 dbabil9 604 22:07:58 12:54:47
s 1769482 0x6b997db0 --ra-r----- oracle9 dba9 oracle9 dba9 2004 22:07:15 17:03:39
完成这个操作之后，数据库就可以正常启动了。