Oracle Failed to release Shared Memory on Solaris

I was cloning a database by using a recent hot backup via the following steps:

1. copy datafiles into correct locations
2. startup mount
3. recover database using backup controlfile until cancel
4. after desired archived logs are applied I type cancel
5. alter database open resetlogs

I then did a shutdown of the instance, however, the sahred memory segments for oracle were not released. I was unable to startup a new instance not try and shutdown the previous instance again. I have to explictly remove the shared memory segments (using ipcrm as the oracle user)

Once this was done I could start the instance back up.

Just curious why this occured, and if it is related to any memory/sga configurations. I had just changed the hard limit for open file descriptors to 4096 from 1024.

Thanks,
CC

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