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

Hi Gonen,  

Direct I/O is depends on the operating system, you are using. Like in UNIX/LUINUX/SOLARIS, you can use Direct I/O or File System's Buffer Cache. In Windows there is nothing like O/S Buffer Cache. So you cannot use it. Yes you can use Direct I/O in UNIX/LINUX/SOLARIS, for this you need to modify the file system buffer cache.  

In the Windows it uses DIRECT I/O, means the blocks are read directly from the disk and passes to the application that is required this.  

So when you are creating a Database in Windows you can use any block size. But in UNIX/LINUX/SOLARIS you have to consider your FILE SYSTEM BUFFER CACHE. Say your o/s file system buffer cache is 4k, then there is no use to define the block size of 8k, as for any single i/o the o/s has to send the request twice.  

Hope your issue has been solved :-)  

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Regards,

Sunil Bhola

Oracle_Expert, Moderator

Connor McDonald <mcdonald.connor_at_gmail.com> wrote: Oracle database IO on windows is automatically direct IO akaik...

hth
connor

On 6/23/05, Amihay Gonen wrote:
>
> Hi ,
> Can I use directIO (disable file cache) on windows platform ?
>
> I've tried to search but I haven't find answer.
>
>
> Amihay Gonen
> DBA,
> 972-3-9268280
>
> Be there ... -> http://golan/Forum%20DBA/default.aspx
>

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Connor McDonald
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Regards,
Sunil Bhola
Oracle_Expert, Moderator











		
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