文档解释
ORA-30500: database open triggers and server error triggers cannot have BEFORE type
Cause: An attempt was made to create a trigger that fires before the database is open or before server errors, but these types of triggers are not supported.
Action: Do not attempt to create a trigger that fires before the database is open or before server errors.
ORA-30500是由于尝试创建具有类型BEFORE的数据库打开触发器或服务器错误触发器而引起的Oracle错误。