ORA-22287: invalid or modified directory occurred during string operation
Cause: The directory alias used for the current operation is not valid if being accessed for the first time, or has been modified by the DBA since the last access.
Action: If you are accessing this directory for the first time, provide a valid directory name. If you have been already successful in opening a file under this directory before this error occured, then close the file and retry the operation with a valid directory alias as modified by your DBA. Oracle recommends that directories should be modified only during quiescent periods.
ORA-22287是一种常见的Oracle数据库错误，这个错误表明在使用字符串运算操作期间发生了无效或被修改的目录。
该ORA-22287错误表明，在执行字符串操作时发生了无效的目录或发生了目录结构修改，从而导致无法正确使用该目录。
1.检查将要访问的目录是否存在，或在其他服务器上是否正确设置。
2.检查目录的安全性设置，确保用户有访问权限，并可以访问该目录。
3. 必要时，重新设置目录结构以符合要求。