Re: AIX and RAW-device/filesystem
From: <smith117_at_delphi.com>
Date: Sat, 27 Aug 94 08:28:08 -0500
Message-ID: <Rc0TFt4.smith117_at_delphi.com>
Date: Sat, 27 Aug 94 08:28:08 -0500
Message-ID: <Rc0TFt4.smith117_at_delphi.com>
The reason for the confusion and apparrent contradiction is that that section of the manual is referring to the function of the SGA.
The SGA has an i/o buffer that sits between oracle and the disks or file systems. It holds writes to disk until the optimum time, instead of putting DB performance at the mercy of the underlying os data mgmt subsystems. This allows for peak performance.
See the Oracle 7 server concepts manual for all the non-system specific architectural features.
PS- The reason for the overhead of raw vs filesystem on AIX is that their filesystem uses a fast journaling mechanism for fs based data. Raw LV's are do it yourself, and less efficient.
Regards,
Dan Received on Sat Aug 27 1994 - 15:28:08 CEST