Re: Q: does DirectIO on windows is supported on file systems ?

On 6/23/05, Sunil Bhola <oraclebhola@xxxxxxxxx> wrote: 
> 
> Hi Paul,
>  Thanks for correcting me. But I forget to speicify that the Professional 
> Windows with NTFS File System dont have file system buffer cache. Correct me 
> if I am wrong.
>  Regards,
> 
 You're wrong! Check out task manager and the performance tab, that figure 
for System Cache is the filesystem cache that is currently allocated. See 
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win32_perfformatteddata_perfos_cache.aspfor
the management instrumentation details and a description of what the
'System Cache' really is. 
 I'm not quite sure what Paul means about turning off the filesystem cache 
for Oracle systems, I guess you'd gain a little more RAM to devote to 
Oracle, but Oracle on Win32 performs DirectIO anyway. 
 -- 
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex.com

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