Re: AIX Asynch I/O vs Mult DBWRs os I/O slaves

From: Andrew May <amay_at_home.com>
Date: Tue, 23 Feb 1999 04:01:08 GMT
Message-ID: <36D2284A.268DAF76@home.com>

Multiple dbwr processes is a software simulation of asynchronous I/O. So I would always go with async_io.

If you are getting waits for that in v$session_wait/system_event, then maybe you need to try spreading the I/O or tuning the application further.

Andrew.

Daniel P. Considine wrote:
>
> platform AIX 4.2.1
> sever 7.3.4.3
>
> anyone know if running
> multiple DBWRs w/out Asynch I/O (1)
> is preferable to 1 DBWR with Asynch I/O (2) or
> running (1) with DBWR I/O Slaves (3)
>
> oracle recommends (2)
> we are noticing dbwr wait problems
>
> thanks
>
> Daniel P. Considine
> Global Information Services
Received on Mon Feb 22 1999 - 22:01:08 CST