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TAPE_ASYNCH_IO controls whether I/O to sequential devices (for example, backup or restore of Oracle data to or from tape) is asynchronous—that is, whether parallel server processes can overlap I/O requests with CPU processing during table scans. If your platform supports asynchronous I/O to sequential devices, Oracle recommends that you leave this parameter set to its default. However, if the asynchronous I/O implementation is not stable, you can set
false to disable asynchronous I/O. If your platform does not support asynchronous I/O to sequential devices, this parameter has no effect.
See Also:Oracle Database Performance Tuning Guide for more information on asynchronous I/O and on setting this parameter