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Some operating systems provide kernel support for asynchronous I/O on raw devices, but not on regular files. As a result, even if the database server is capable of using asynchronous I/O, it cannot issue asynchronous I/O requests when the database is built on a file system. Lack of asynchronous I/O significantly degrades performance. Quick I/O allows the database server to take advantage of kernel supported asynchronous I/O (through the asyncdsk or Posix AIO interface) on file system files accessed via the Quick I/O interface by providing a character device node that is treated by the OS as a raw device.