文档解释
ORA-12495: cannot disable an enabled level, category, or release category
Cause: You attempted to disable a level, category, or release category that had previously been enabled. An enabled label definition may be exist in some database label, so cannot be disabled.
Action: If the label definition is no longer valid, change its name to one that identifies it as invalid. When any labels are converted to character strings, the new label definition will be used.
ORA-12495表示在试图停用一个已经启用的等级、类别或发布类别时发生了错误。
官方解释
“ORA-12495：无法禁用已启用的级别，类别或发布类别”。
常见案例
你仅可以启用类别或发布类别，如果它原本是停用的，而不能禁用其中一个，就会报出ORA-12495错误。
正常处理方法及步骤
解决此错误的正确途径是，允许该等级、类别或发布类别处于停用状态，而不是尝试停用一个处于启用状态的类别或发布类别。
