Changing data in the undo tablespace or db Oracle buffer cache

Hello

I have serious doubt in the feature of oracle architecture, when a user issues an update statement, the data blocks are transported to the db buffer cache and where the data changes are made? Made a copy data block is stored in the cache db pads and the changes are made to the block in the buffer cache? or the copy of the data block is stored in the undo tablespace and changes are made to the blocks in the undo tablespace?

In singles, the changes to the data blocks are make to the db or undo tablespace buffer cache?

Thanks in advance

Kind regards
007

Did you have a look to the Internet for the answer?

In short, if a trial Oracle wants to update a record in the table, it does:

-Read the record to be changed in the buffercache
-Audits (the record already locked, is the update allowed)
-Put the folder (called image before) in a rollback in the UNDO tablespace segment
-Writing redo information about this change in the UNDO tablespace
-Lock the record
-Write the change in registration in the buffer cache
-Put the change also in the redo buffer
S ' sit and wait... (for a commit or a rollback)

When are committed:
-Release the lock
-Empty folder of restoration since the UNDO tablespace
-Write a record of this change forward in the UNDO tablespace

When rollback:
-Release the lock
-Rinse the record changed the buffercache
-Read the original value
-Empty folder of restoration since the UNDO tablespace
-Write a record of this change forward in the UNDO tablespace

It of here, some more specific complexity when a checkpoint occurs between the change and the commit / rollback or redo buffer has been emptied for redo files

Please any other s/n, correct me if I'm wrong...

See you soon
FJFranken

Tags: Database

Similar Questions

The UNDO tablespace and its data file cannot be removed
I would like to delete an UNDO tablespace after you have created a new, but can't. I could follow a large number of instructions TOM and others, but tablepspace is still listed in the State to RECOVER. Please see what I've done below. Your help will be appreciated.

SQL > drop tablespace UNDOTBS2;
Drop tablespace UNDOTBS2
*
ERROR on line 1:
ORA-01548: active rollback segment "_SYSSMU29_1272378969$" found, terminate
drop the tablespace
SQL > drop rollback segment "_SYSSMU29_1272378969$";
Drop rollback segment "_SYSSMU29_1272378969$".
*
ERROR on line 1:
ORA-30025: DROP segment ' _SYSSMU29_1272378969$ ' (in the undo tablespace) not
permit

Have you tried that
http://arjudba.blogspot.com/2008/08/ora-01548-active-rollback-segment.html

undo_segments in the undo tablespace

(1) at least how undo_segments in undo tablespace?

Is optimal?
If I increase the size of the undo tablespace, undo_segments counts also have increased!

Version of DB is 10g

Hello

The two time oracle maintains exactly 10 segments. (you can see nom_segment begins by _SYSSMU11)

I'm not clear on what exactly 10 segments. I have undo tablespace of ~ 250 GB with 6676 stored in dba_rollback_segs.

3) why undo tablespace with the only spaceMo 46,8125 '?

(4) I mean why he is stiil 450Mo undo_retention even through time or same validation has occurred?

Just Oracle - Doc

Once a transaction is committed, the undo data are more necessary for purposes of recovery rollback or transaction. However, for consistent read purposes, long-running queries may require old undo information to produce older images of data blocks. In addition, the success of several Oracle Flashback features can also depend on the availability of the old cancellation information. For these reasons, it is desirable to keep the old information of cancellation for as long as possible.

Introduction to the management of the automatic cancellation

With undo tablespace, you would see extended with the status ACTIVE, EXPIRED, extents still to RUN.

Active cancellation extended are used by transactions and will be always active, because they are needed for the restoration.

Extensions has expired are not used by transactions, the data contained in these extended is committed and the time UNDO_RETENTION is passed, so it is not necessary for the coherence of reading and can be reused.

Not expired extensions are extended no assets but honor UNDO_RETENTION. Transactions belonging to these bodies of cancellation are determined, but the retention time has failed, and it may be necessary for the coherence of reading!

Paste the query result - below

! undo_extent_stat.SQL more

status of collar for a30

Select the State,

round (sum_bytes / (1024 * 1024), 0) like MB,.

Tour ((sum_bytes / undo_size) * 100, 0) as PERC

Of

(

Select the State, sum (bytes) sum_bytes

of dba_undo_extents

Status group

),

(

Select sum (a.bytes) undo_size

from dba_tablespaces c

Join v$ tablespace b on b.name = c.tablespace_name

Join v$ datafile on a.ts # b.ts = #.

where c.contents = 'UNDO '.

and c.status = 'ONLINE '.

);

Anand

import data into the different tablespace
Hello

I had exported a my schema of production data now I want to import data in the schema of the trial, I had mentioned the tablespace default for the trial scheme, but when I import data is not taking default tablespace of schema of its database taking default tablespace. How to import data into the different tablespace. In remap_tablespace where I can specify the touser.

my version of oracle database:

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
AMT for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

-------------------------------------------------------------------------------------------------------------------------------------------
Raj wrote:
Hello

I had exported a my schema of production data now I want to import data in the schema of the trial, I had mentioned the tablespace default for the trial scheme, but when I import data is not taking default tablespace of schema of its database taking default tablespace. How to import data into the different tablespace. In remap_tablespace where I can specify the touser.

my version of oracle database:

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
AMT for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

-------------------------------------------------------------------------------------------------------------------------------------------

If your storage source and destination areas are different, you must use the remap_tablespace option.
example:

System $impdp / * directory = data_pump_dir dumpfile = logfile = schema_refresh.log remap_schema = Prd_schema:Tst_schema remap_tablespace = prd_TBS:tst:TBS schema_refresh.dmp

How to reduce the UNDO Tablespace
Hello
We had an UNDO Tablespace to 22 GB but it's using just 2GB. How to shrink the undo tablespace. We use the database in production cluster 3 node 10.2.0.4
Is there is way we can worry about UNDO Tablespace or should I create an UNDO tablespace and assign the undo tablespace to DB and let fall the old CANCEL?
How to ensure that the transactions are done and free to abandon the old CANCEL?
That's what we must restart all three nodes each node has its own UNDO Tablespace.

Need help on this issue.

would appreciate your quick response.

Thank you
No you have not.

concerning
Mohamed

Impossible to drop the undo tablespace

Hello

ORACLE VERSION: 11.1.0
OPERATING SYSTEM: WINDOWS XP

I have been uable to drop the undo tablespace. Here I create a new undo tablespace and trying to drop the old undo tablespace.

I had given alter system set UNDO_TABLESPACE = newundo tablespace.

And try to drop the old one and get the error like this

SQL> create undo tablespace undotbs02 datafile 'F:\APP\POORNAPRASADS\ORADATA\ORCL\UNDOTBS02.dbf' size 200m;

Tablespace created.

SQL> sho parameter undo

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      AUTO
undo_retention                       integer     900
undo_tablespace                      string      UNDOTBS1
SQL> alter system set undo_tablespace=undotbs02;

System altered.

SQL> sho parameter undo

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      AUTO
undo_retention                       integer     900
undo_tablespace                      string      UNDOTBS02
SQL> drop tablespace undotbs1 including contents and datafiles;
drop tablespace undotbs1 including contents and datafiles
*
ERROR at line 1:
ORA-30013: undo tablespace 'UNDOTBS1' is currently in use


SQL> drop tablespace undotbs1 including contents and datafiles;
drop tablespace undotbs1 including contents and datafiles
*
ERROR at line 1:
ORA-30013: undo tablespace 'UNDOTBS1' is currently in use

There are active sessions that use of old undo segments. I think you should kill these sessions in order to relase these segments

- - - - - - - - - - - - - - - - - - - - -
Kamran Agayev a. (10g OCP)
http://kamranagayev.WordPress.com
[Step by step installation Oracle Linux and automate the installation by using Shell Script | http://kamranagayev.wordpress.com/2009/05/01/step-by-step-installing-oracle-database-10g-release-2-on-linux-centos-and-automate-the-installation-using-linux-shell-script/]

Block in the Undo tablespace corruption
Dear all,

I'm using oracle 10.1.0.2.0. Today because of the abnormal termination block corrouption in undo tablespace found and database will not open.
In the alert log file

Errors in the e:\oracle\product\10.1.0\admin\orc1\udump\orc1_ora_3188.trc file:
ORA-01578: block ORACLE (corrupted file # 37, block # 25) data
ORA-01110: data file 37: ' E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORC1\UNDOTBS0. DBF'

Sea Jul 07 10:18:42 2010
1578 error happened during db open, close the database
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Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_arc3_3900.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:43 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_arc3_3900.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:43 2010
Arc0: Assessment of the archive log 2 sequence of thread 1 479
Sea Jul 07 10:18:43 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_dbw0_3692.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:43 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_ckpt_1552.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:43 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_mman_3912.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:44 2010
Newspapers archived by another process
Sea Jul 07 10:18:44 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_pmon_3744.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:44 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_arc1_3668.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:44 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_arc1_3668.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:45 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_reco_1076.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:45 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_smon_2660.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Sea Jul 07 10:18:45 2010
Errors in the e:\oracle\product\10.1.0\admin\orc1\bdump\orc1_lgwr_1796.trc file:
ORA-01578: ORACLE data block corrupted (file #, block #)

Instance of stopped by USER, pid = 3188
ORA-1092 marked during: ALTER DATABASE OPEN...

Concerning
Errors in the e:\oracle\product\10.1.0\admin\orc1\udump\orc1_ora_3188.trc file:
ORA-01578: block ORACLE (corrupted file # 37, block # 25) data
ORA-01110: data file 37: ' E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORC1\UNDOTBS0. DBF'

You have rman or backup to hot/cold? If so try like:
* 1.*
```
sqlplus "/as sysdba"
shutdown immediate;
startup mount;
/*restore undo datafile then*/
recover datafile 37;
alter database open;
```
* 2 If you have backup rman, then try
```
rman terget /
blockrecover datafile 37 block 25;
```
* 3.* If you don't have a backup, you can start your database without this undo tablespace.

1. backup current database;

2. change pfile (parameter file) change undo_tablespace and undo_management as:
```
undo_management=manual
undo_tablespace=UNDOTBS2
```
If you do not use pfile create pfile from spfile as:
```
sqlplus "/as sysdba"
create pfile='pfilelocation' from spfile='spfilelocation';
```
3. then start database as:
```
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount pfile D:\oracle\product\10.2.0\admin\TEST\pfile\init.ora.5162
010113556
SP2-0714: invalid combination of STARTUP options
SQL> startup mount pfile= D:\oracle\product\10.2.0\admin\TEST\pfile\init.ora.516
2010113556
ORACLE instance started.

Total System Global Area  138412032 bytes
Fixed Size                  1288172 bytes
Variable Size              62916628 bytes
Database Buffers           67108864 bytes
Redo Buffers                7098368 bytes
Database mounted.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF'

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------

D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSTEM01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\SYSAUX01.DBF
D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\USERS01.DBF

SQL> alter database datafile
'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS01.DBF' offline drop;

Database altered.

SQL> alter database open;

Database altered.

SQL> create undo tablespace UNDOTBS2
datafile 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\UNDOTBS2' size 200M;

Tablespace created.

SQL> create spfile from pfile;

File created.

SQL>
```

Bug in data modeling: create undo tablespace
The output of the DDL script for the Undo type tablespace has a spelling error:

CREATE UNDO TABLESPACE UndoTBS1 PETIT_FICHIER
DATA FILE
' C:\oracle\product\10.2.0\oradata\VolksNet\UNDOTBS01. DBF ' SIZE 512 M AUTOEXTEND ON NEXT MAXSIZE 16 K UNLIMITED
LOCAL MANAGEMENT MEASURE
GUARANTEE OF TENSIONING
;

It spells TENSION instead of RETENTION.
Thank you, I logged a bug.

Please note that we have a feedback customer specific applications to track issues for data modeling, although it is still an early release of the adopter. The link is http://apex.oracle.com/pls/otn/f?p=2306:10

Sue

It will frequently commit resolve ora-30036 (cannot extend the undo tablespace)

I use 11.2.0.3 database. I confused on the use of validation to resolve ora-30036.
I have the script in migration once that has many updates and I'm getting ORA-30036 (unable to extend segment by 4 in the "UNDOTBS" undo tablespace) .
Our undo tablespace in NO mode autoextend and like this is just a one time event, we will not increase it. He is currently 6 GB.
We would commit determination ORA-30036 in my case? If not why? Is there a better solution to solve it.

When I say commit frequent, I won't commit after each line, I just want to commit after may be million lines, so that my active cancellation extend turn into cancellation remaining will extend and Oracle will be able to use it in case of pressure of space.

Note:
UNDO_MANAGEMENT: AUTO
UNDO_RETENTION: 2700
Undo tablespace retention is NOGAURANTEE.

I have the script in migration once that has many updates and I'm getting ORA-30036 (unable to extend segment by 4 in the "UNDOTBS" undo tablespace).

Our undo tablespace in NO mode autoextend and like this is just a one time event, we will not increase it. He is currently 6 GB.

Why don't you increase it?

You must use the correct size of UNDO necessary for the work that will be done.

A lot of shops to create a for big lots new UNDO tablespace and then switch to it for batch processing. Once the task is completed, they switch back to the normal UNDO. That prevents the normal RETURN of autoextending far where it is normally necessary:

ALTER SYSTEM SET UNDO_TABLESPACE

ORA-01555 - Tuning for the UNDO tablespace.
Dear DBA Kings/Queens,

I often "ORA-01555 snapshot too old error" due to the special delete statement. Which removes the lines about 50 000 all day as a batch. Eventhough, I reduced to 50 000 to 10 000 and 1000. No luck.
Can someone tell me how to set UNDO tablespace.
-----------------------------------------------------------------------------
Oracle9i Enterprise Edition Release 9.2.0.7.0 - 64 bit Production
PL/SQL Release 9.2.0.7.0 - Production
CORE 9.2.0.7.0; Production
AMT for Solaris: release 9.2.0.7.0 - Production
NLSRTL Version 9.2.0.7.0 - Production
-----------------------------------------------------------------------------
SQL > show Cancel parameter

VALUE OF TYPE NAME
------------------------------------ ----------- ------------------------------
UNDO_MANAGEMENT string AUTO
UNDO_RETENTION integer 10800
undo_suppress_errors Boolean TRUE
undo_tablespace string UNDOTBS1
-----------------------------------------------------------------------------

Size in GB:

TOTAL USED FREE USED_PCNT NOM_TABLESPACE
------------------------------ ---------- ---------- ---------- ----------
UNDOTBS1 13.5; 1.34; 12.17; 9.89
Which removes the lines about 50 000 all day as a batch

Has often committed?
-do not commit frequently.

-Increase the setting "undo_retention.

-reduce the duration of operation (plan use of execution to check your query)... perhaps may create index. Or to commit all the 5000 rows

-For collecting statistics on the table

Edited by: Surachart Opun (HunterX) July 23, 2009 12:04 AM

JSF ADF how to set validation control activated when they change data in the table
Using JDev 10.1.3.4 and Oracle ADF/BC

I have a search engine simple with two fields of research related to the parameters of the entity VO. Below, I have a table in the view with two editable text fields. In the component actions table, I put a buttons of commit and rollback.

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Are you sure you're in the right catalog?

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Change data type column - performance of indexes in Oracle 10 g
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Is it possible to find the installation Date and time of Oracle on Windows?

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Reply by Satish sir at the following link:
installation of a database date/time!

HTH
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Changing data in the undo tablespace or db Oracle buffer cache

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