ORA-30502: system triggers cannot have INSERT, UPDATE, or DELETE as triggering events

文档解释

ORA-30502: system triggers cannot have INSERT, UPDATE, or DELETE as triggering events

Cause: An attempt was made to create a system trigger with INSERT, UPDATE, or DELETE triggering events, but this type of trigger is not supported because a system trigger does not have a base table.

Action: Do not attempt to create a system trigger with INSERT, UPDATE, or DELETE triggering events.

本错误是因为试图创建的触发器无法包括INSERT, UPDATE, or DELETE三种操作作为触发条件。

官方解释

ORA-30502:“系统触发器不能包含INSERT,UPDATE或DELETE作为触发事件。”

该错误消息指出,在使用CREATE_TRIGGER语句创建数据库触发器时,不允许将INSERT, UPDATE或DELETE作为触发操作。

常见案例

在创建触发器时,用户试图更新数据库中的某些表,如果触发器显示错误信息:ORA-30502,这表明没有INSERT,UPDATE或DELETE触发器。

一般处理方法及步骤

要解决ORA-30502错误,首先需要确定使用什么样的触发事件。可以使用ON LOGON,ON LOGOFF,ON SERVERERROR,ON SHUTDOWN之类的系统触发器,但不能使用INSERT,UPDATE或DELETE触发器。例如,使用:

CREATE OR REPLACE TRIGGER my_trigger

BEFORE LOGON ON DATABASE

BEGIN

— Your trigger code here

END;

/

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