Oracle OCP 1Z0 O53 Q48(FILESYSTEMIO_OPTIONS)

abstractcyj發表於2016-03-31
Oracle
48.View the Exhibit to examine the error obtained during the I/O calibration process. There are no data
files on raw devices. What is the reason for this error?

A. The DISK_ASYNCH_IO parameter is set to TRUE.
B. The FILESYSTEMIO_OPTIONS parameter is set to NONE.
C. Another session runs the I/O calibration process concurrently.
D. The pending area has not been created before running the I/O calibration process.
Answer: B

非同步IO可以通過引數FILESYSTEMIO_OPTIONS來開啟

參考：http://blog.csdn.net/jgmydsai/article/details/36397241

        http://docs.oracle.com/cd/E11882_01/server.112/e41573/os.htm#PFGRF94412

9.1.1.2 FILESYSTEMIO_OPTIONS Initialization Parameter

You can use the FILESYSTEMIO_OPTIONS initialization parameter to enable or disable asynchronous I/O or direct I/O on file system files. This parameter is platform-specific and has a default value that is best for a particular platform.

FILESYTEMIO_OPTIONS can be set to one of the following values:

  • ASYNCH: enable asynchronous I/O on file system files, which has no timing requirement for transmission.

  • DIRECTIO: enable direct I/O on file system files, which bypasses the buffer cache.

  • SETALL: enable both asynchronous and direct I/O on file system files.

  • NONE: disable both asynchronous and direct I/O on file system files.

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