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.
使用FILESYSTEMIO_OPTIONS初始化参数在文件系统文件上启用或者禁用异步I/O或者直接I/O。这个参数是平台特有的,针对特定的平台最好有个默认值。
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.
在文件系统文件上启用异步I/O,在数据传送上没有计时要求。
DIRECTIO: enable direct I/O on file system files, which bypasses the buffer cache.
在文件系统文件上启用直接I/O,绕过buffer cache。
SETALL: enable both asynchronous and direct I/O on file system files.
在文件系统文件上启用异步和直接I/O。
NONE: disable both asynchronous and direct I/O on file system files.
在文件系统文件上禁用异步和直接I/O。
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