IPCRM command in linux is used to remove a shared memory
segment.In order to remove a shared memory segment , we can get the shmid from
the ipcs and remove using
Ipcrm –m 4227074
Similarly a Message Queue can be removed by using,
ipcrm -q 4227074
Sometimes when you shutdown the database instance, the shared
memory segments may not be completely cleaned up by the Linux kernel. The
shared memory left behind is not useful; but it hogs the system resources
making less memory available to the other processes. In that case, you can
check any lingering shared memory segments owned by the “oracle” user and then
remove them, if any using the ipcrm command.
