Re: Async_io set up HP-UX for 10g Instances(these are apps instances)

Edwin

• dbwr_io_slaves is used to simulate asynch io on platforms that do not support it (for example, hp-ux with a filesystem (and not using raw devs)).
• db_writer_processes is used to start up multiple dbwr processes that will manage the buffer cache together, if one process alone is too slow. your value of 4 seems a bit high. How large is your sga / buffer cache ? Do you really need 4 processes ?
• disk_asynch_io is used to enable the oracle kernel to make use of asynchronous io, IF the OS supports it.

Stefan

On 8/2/07, edwin devadanam <edwin_kodamala_at_yahoo.com> wrote:
>
> Hi
>
> We have this setup
> db_writer_processes = 4 disk_asynch_io = false
>
> I have doubts whether i can set the below on....
> please suggest advantages and disadvantages of below setting.......on
> HP-UX
> disk_asynch_io = TRUE
> tape_asynch_io = TRUE
>
> am unclear mainly about disk_asynch_io,db_writer_processes,DBWR_IO_SLAVES
>
> Any help would be appreciated.
>
> Regards,
> Edwin.K
>
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Stefan P Knecht
Consultant
Infrastructure Managed Services

Trivadis AG
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