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RE: Please a parameter to disable undo, like _disable_logging

Bobak, Mark

2004-10-06

Replies:
I can't get it to work, either:
SQL> create table undo_Test nologging as select * from dba_objects;

Table created.

SQL> desc undo_test
Name                         Null?   Type
----------------------------------------- -------- =
----------------------------
OWNER                               VARCHAR2(30)
OBJECT_NAME                           VARCHAR2(128)
SUBOBJECT_NAME                         VARCHAR2(30)
OBJECT_ID                            NUMBER
DATA_OBJECT_ID                         NUMBER
OBJECT_TYPE                           VARCHAR2(18)
CREATED                             DATE
LAST_DDL_TIME                         DATE
TIMESTAMP                            VARCHAR2(19)
STATUS                              VARCHAR2(7)
TEMPORARY                            VARCHAR2(1)
GENERATED                            VARCHAR2(1)
SECONDARY                            VARCHAR2(1)

SQL> update undo_test set object_name =3D 'MJB';

40237 rows updated.

SQL> select used_ublk,used_urec from v$transaction where addr in(select =
taddr from v$session where sid=3D(select sid from v$mystat where =
rownum=3D1));

USED_UBLK USED_UREC
---------- ----------
    551    40238

SQL> rollback;

Rollback complete.

SQL> exec dbms_transaction.begin_discrete_transaction

PL/SQL procedure successfully completed.

SQL> update undo_test set object_name =3D 'MJB';

40237 rows updated.

SQL> select used_ublk,used_urec from v$transaction where addr in(select =
taddr from v$session where sid=3D(select sid from v$mystat where =
rownum=3D1));

USED_UBLK USED_UREC
---------- ----------
    551    40237

Any thoughts or comments, Lex? Or others?

-----Original Message-----
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Pacheco
Sent: Wednesday, October 06, 2004 3:10 PM
To: oracle-l@(protected)
Subject: RE: Please a parameter to disable undo, like _disable_logging


Based on my test=20
Begin discrete transaction don't work disabling undo information, =
because I
can see data before the commit.

SQL> exec DBMS_TRANSACTION.BEGIN_DISCRETE_TRANSACTION;
SQL> update test set object_name =3D 'a';
SQL> select distinct object_name from test;

OBJECT_NAME
-------------------------------------------------------------------------=
----


a



When there is not undo info you can't do that, for example append don't
generate undo info, and you can't see data
until you commit.

SQL> insert /*+ APPEND */ into test select * from dba_objects;
29291 rows created.
SQL> select distinct object_name from test;
select distinct object_name from test
                     *
ERROR at line 1:
ORA-12838: no se puede leer/modificar un objeto despu=DAs de modificarlo =
en
paralelo




Or I'm wrong.

Thanks in advance.


Juan Carlos Reyes Pacheco
OCP
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