ORA-12476: least upper bound resulted in an invalid OS label
Cause: You tried to do an operation that generated a least upper bound (LUB) label which is not a valid label on your operating system.
Action: Consult your OS label management documentation for information on invalid label generation.
ORA-12476错误是由数据库内核发出的错误消息。它表明操作系统的最大支持层次（least upper bound label）不再有效。它可能代表数据库不再支持Oracle软件所在的操作系统。