ORA-38476：abstract type used for an Attribute set may not be modified.
错误码
错误描述：abstract type used for an Attribute set may not be modified.
错误原因：An attempt was made to alter a type (ADT) that is used to maintain an attribute set of an Expression set.
解决方法：Do not modify the ADT directly. Use DBMS_EXPFIL APIs instead.
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