Re: Re[2]: About parallel server

From: Richard Ji <rji_at_exenet.com>
Date: Thu, 31 May 2001 07:28:27 -0700
Message-ID: <F001.0031597C.20010531065559@fatcity.com>

Dick,

Just curious, I can see putting the control file on a file system but I failed to see how can you put
online redo logs on file system in OPS. Unless you are using distributed file system? How does
one node do instance recovery for the failed node?

Richard Ji

>>> dgoulet_at_vicr.com 05/31/01 01:10AM >>> Brian,

I was looking at parallel server for an application we were developing last year. In 8.1.6 at least the control and on-line redo (not rollback segment) files no longer had to be on raw devices. And I stand corrected, there is one and only one standard unix command that does work, dd. It's just such a pile of alphabet soup. That's why we hired a couple of top notch Unix admins. They handle it.

Dick Goulet

---------------------- Reply Separator ----------------------

Author: Brian MacLean <bmaclean_at_vcommerce.com> Date: 5/30/01 3:50 PM

Your point 1:

Unless things have changed redo and controlfiles must be raw. When I took
the OPS course several years ago and worked with OPS we needed the redo/controlfiles to be on raw so that one instance could recover when another instance failed.

Your point 5:

The Unix command "dd" will do raw.

-----Original Message-----
Sent: Wednesday, May 30, 2001 3:48 PM
To: Multiple recipients of list ORACLE-L

Fernando,

Replies included in your original mail, but in addition:

Parallel server is a separately priced option from Oracle and it is pricey.
Second you may need specific software from you OS vendor to coordinate the
file
sharing between the servers, again an additional expense.

Dick Goulet

____________________Reply Separator____________________
Author: "Fernando Papa" <fpapa_at_elsitio.com.ar>
Date:       5/30/2001 2:07 PM

Hi everybody!

I have some questions about parallel server. Now we have only one instance
"stand-alone" (no parallel), but we are thinking to switch to parallel server because we have a couple of sparc 3500 and nobody are using it, and
we think it's good for increase our processing power.

The problem is I didn't work with parallel server and I have a lot of questions about it:

Is mandatory to use raw devices for control files, redo logs & data files?
--> Data files yes, redo and control files can be on cooked file
system.
How we transfer our cooked data files to raw devices data files? import/export? or exist another better (fast) method?
--> To the best of my knowledge your going to have to rebuild the
database from scratch so imp/exp is your only option.
If I start with only one node, performance will be the same of one single instance (no parallel)?
--> Yes and NO, raw devices run a little faster than cooked files since
the OS's buffer cache is not in the middle.
Somebody know how to work with raw devices under solaris? any link? I try to found someting in metalink but there's no samples...
--> Working with raw devices is very different from cooked file systems.
If you don't have an experienced Unix admin you could be in serious trouble.
What about backup? I can't put tablespaces in backup mode and copy with cp... maybe it's time to use rman?
--> Rman can handle the backups, but a file system level backup is
different. CP does not work anymore, nor does fbackup, or tar. You'll need specialized software for the purpose.

Thanks in advance!

--
Fernando O. Papa
DBA
El Sitio - Infraestructura
(54-11) 4339-3854

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Received on Thu May 31 2001 - 09:28:27 CDT