OSD-04400: unable to acquire internal semaphore for process and OS 183 (Windows)
I hit the following problem with a 9.2.0.8 database running on Windows 2003 this morning (info pulled from the alert log). The database had failed to restart after a client’s cold backup process 🙄 ALTER DATABASE MOUNT Wed Jan 15 22:32:08 2014 ORA-09341: scumnt: unable to mount database OSD-04400: unable to acquire internal semaphore for