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RE: Undo x Rollback Segments in 9i

From: Godlewski, Melissa <Melissa.Godlewski_at_hq.doe.gov>
Date: Fri, 21 Sep 2001 13:41:49 -0700
Message-ID: <F001.0039548B.20010921134525@fatcity.com>

Taken from Oracle 9i Admin book.

You cannot use both methods in the same database instance, although for migration
purposes it is possible, for example, to create undo tablespaces in a database that is
using rollback segments, or to drop rollback segments in a database that is using
undo tablespaces. However, you must shutdown and restart your database in order
to effect the switch to another method of managing undo.

If you use the rollback segment method of managing undo space, you are said to be
operating in the manual undo management mode. If you use the undo tablespace method, you are operating in the automatic undo management mode. You determine the mode at instance startup using the UNDO_MANAGEMENT initialization
parameter.

-----Original Message-----

Sent: Friday, September 21, 2001 5:17 PM To: Multiple recipients of list ORACLE-L

I don't have a lot of extensive experience with 9i, but from what I red, you can change it on the fly. Don't quote me on it.

"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."

Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275

Fuelspot
73 Princeton Street
North, Chelmsford 01863  

-----Original Message-----

Sent: Friday, September 21, 2001 4:25 PM To: Multiple recipients of list ORACLE-L

Christopher,

Can you switch modes once the database has been in use for a while? Or do you need to recreate the database in order to do that?

Thanks,

Cherie  

                    Christopher

                    Spence               To:     Multiple recipients of list
ORACLE-L <ORACLE-L_at_fatcity.com>      
                    <cspence_at_FuelS       cc:

                    pot.com>             Subject:     RE: Undo x Rollback
Segments in 9i                          
                    Sent by:

                    root_at_fatcity.c

                    om

 

 

                    09/21/01 02:30

                    PM

                    Please respond

                    to ORACLE-L

 

 





There are two modes of rollback in 9i, undo and rollback. You either use the old way, or the new automatic way, but not both.

You would need to turn off the new feature if you want to use the old method
of doing redo.

"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."

Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275

Fuelspot
73 Princeton Street
North, Chelmsford 01863

-----Original Message-----

Sent: Thursday, September 20, 2001 9:40 PM To: Multiple recipients of list ORACLE-L

Friends :

I tried to create a rollback segment in 9i and its said to me :

CREATE PUBLIC ROLLBACK SEGMENT "RBS01" TABLESPACE "RBS" *
ERROR at line 1:
ORA-30019: Illegal rollback Segment operation in Automatic Undo mode

Well, i realized that Oracle created for me some resource like rollback segment automaticaly.

My doubt :

If i will put the instance in Manual Undo I can to create the rollback segment, but i will lost the resource automatic.

does anyone use it or know how to use Automatic Undo ?

What is the best option :

Rollback or Undo Automatic.
I know rollback but i don't know Undo Automatic

Regards

Eriovaldo



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  INET: Cherie_Machler_at_gelco.com

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Author: Christopher Spence
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Author: Godlewski, Melissa
  INET: Melissa.Godlewski_at_hq.doe.gov

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists

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Original text of this message

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