ITPub博客

首页 > 数据库 > Oracle > Oracle OCP 1Z0 O53 Q48(FILESYSTEMIO_OPTIONS)

Oracle OCP 1Z0 O53 Q48(FILESYSTEMIO_OPTIONS)

原创 Oracle 作者:abstractcyj 时间:2016-03-31 16:05:04 0 删除 编辑
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

异步IO可以通过参数FILESYSTEMIO_OPTIONS来开启

参考: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.

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/8520577/viewspace-2073142/,如需转载,请注明出处,否则将追究法律责任。

请登录后发表评论 登录
全部评论
曾从事java方向开发多年。近年已经转入数据库方向。主要擅长SQL优化,Oracle数据库问题诊断,Oracle备份与恢复等。服务于医药物流,医院等行业

注册时间:2010-01-26

  • 博文量
    555
  • 访问量
    833740