用外部表的方式查询当天数据库alert日志文件中当天所有的ora-错误信息
外部表：表中的数据以操作系统文件的方式来存放，现在表中的数据不是放在数据库中了而是放在操作系统上面，Oracle提供了一种直接读取外部数据的机制。外部表好处
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