ORA-28403: file string cannot be modified because it is an online data file

文档解释

ORA-28403: file string cannot be modified because it is an online data file

Cause: An attempt was made to modify an online data file when the file was not expected to be part of the database.

Action: Check the status of the file and its tablespace and make sure it is offline or is a copy of a data file

ORA-28403: file string cannot be modified because it is an online data file是Oracle数据库中常见的错误，指的是在修改一个已经上线的数据文件时发生的错误。

官方解释

常见案例

一般处理方法及步骤

1、必须先将datafile状态修改为不在线状态，可以使用alter database datafile “filename” offline;语句；

2、使用alter database datafile “ filename ” modify;来进行修改文件内容；

3、最后使用alter database datafile “ filename ” online;将文件调整为上线状态。