expdp导出慢的问题

expdp导出慢，看等待事件是Disk file operations I/O。

Disk file operations I/O This event is used to wait for disk file operations (for example, open, close, seek, and resize). It is also used for miscellaneous I/O operations such as block dumps and password file accesses.

Wait Time: The wait time is the actual time it takes to do the I/O Parameter Description FileOperation Type of file operation fileno File identification number filetype Type of file (for example, log file, data file, and so on)
这种问题就是存储慢的问题，硬件层面上的问题。