How to Create Exclusive Rollback Segment

How can we create exclsive rollback segment for a particular
session,
Even setting "set transaction use rollback segment
rollack_segment"
still other session can step on newly created rollback segment

Hi Santanu,
The steps that you mentioned are in sequence. You also need to check if user exist for this requirement.
sap help can give u a good deal of information.

Similar Messages

Creating more rollback segments

Hi,
in a performence report we have :
Contention for undo header = 2.35%
Contention for undo block = 15.34%
If the percentage for an area is more than 1% or 2%, consider
creating more rollback segments.
Does it mean that we should add a file to rollback tablespace ? Is it the only action ? how to create more rollback segments ?
what should we do ?
regards

Try setting UNDO_MANAGEMENT=AUTOIf big1362000 (presumably Big1 to his friends) is still using rollback segments then they shouldn't switch to automatically managed UNDO without a little thought and some impact analysis. However, given the version of the database they're on I think moving to an UNDO tablespace is the better plan in the long run.
Big1362000
Does it mean that we should add a file to rollback tablespace ? No. It means create more rollback segments. You may want/need to add another datafile to the tablesapce used by the rollback segments or even create a new tablespace for the new rollback segments (depending on what your policy is). However, your really ought to think about progressing to Automated Undo Management (it's the wave of the future).
Cheers, APC

How to find out rollback segment offile or online for pertcular schema????

how to find rollbacksegment is online or ofline and space information regarding rollbacksegment?
this is freshely installed 11.5.10.2. defultly how much free space we have????????//
regards
dba

Default rollback segments are always online on database startup.
if you create any new rollback segments then they will be offline by default during startup.
for making newly created rollback segments online by default edit your init_sid.ora file and add the name of rollback segment in rollback_segment parameter.
BTW,why are you concerned about rollback segments,use undo tablespace.

Error while creating the rollback segment (Oracle 8i & OS Win NT)

hi
I am using Oracle 8i and when i am creating the new rollback segment for my database i have got following error message
ORA-01593 Rollback segment optimal size (30 blks) is smaller than the computed initial size (2560 blks)
CREATE ROLLBACK SEGMENT "RBS11" TABLESPACE "RBS1"
STORAGE ( INITIAL 120K NEXT
120K OPTIMAL
240K MINEXTENTS 2
MAXEXTENTS 100)
Note:- db_block size is 8k
Tablespace RBS1 is the Locally managed Tablespace having datafile of 50m and uniform size of 10m
But Given statement processed while i am using Tablespace RBS (winch is data dictionary managed)
Plz, suggest me to cause of that error and solution

You said 120K optimal and initial is 120K with minextents of 2. The optimal size then will be smaller than the initial allocation for the rbs.
ORA-01593: rollback segment optimal size (string blks) is smaller than the computed initial size (string blks)
Cause: Specified OPTIMAL size is smaller than the cumulative size of the initial extents during create rollback segment.
Action: Specify a larger OPTIMAL size.

How to solve about rollback segment fail to extend?

I've a transaction about 50,000 records, then process fail in script. the error code is ORA-01562 FAIL TO EXTEND ROLLBACK SEGMENT = num. I'm use oracle database 7.3.4., form 4.5

It would be better to have several small transactions instead of one huge transaction of 50000 records, like you say. You may use an additional log table to keep the log of how far you've got in processing those 50000 records, and pick up from where you've left in case something goes wrong.
Anyway, one thing that may help would be to use:
alter tablespace your_rbs_tablespace
add datafile ...;
to have more space for your rollback segment(s).
Eventually, you may have a large rollback segment and set transaction use huge_rbs, in order to have your huge transaction use that huge rollback segment.
null

How to create curved line segments in PE v. 4?

Specifically, I want to superimpose curved lines onto a scanned drawing. Thanks in advance.

Tony,
Unfortunately PSE does not have the best drawing tools, but here is way to draw a curve:
1. Create a new layer.
2. Draw an oval with the Elliptical Marquee tool.
3. Edit>Stroke the oval, then erase portions of the oval leaving just the curve.
4. To fine-tune the shape, activate the Move tool and drag the various handles.

How to estimate a rollback segment size for a big transaction?

Oracle 8.1.5. Suppose I have the following statement:
update table_a set col_a = rownum where col_b = 'codeA'
The statement affect 900,000 rows. Type of col_a - float(126).

you can have RBS size same as of your data tablespace
(eg) you have 10 GB tablespace allocated for data
then same 10GB more less should be comfortable

How to online datafile of rollback segment of NO archive log available

I set offline datafile of rool back segement and rename it
but when I try to online , get error to recover
I try to recover but unfortunately all archive log was deleted ( kind of cron job in unix aotu delete these file)
Pls advice how can I set this data file online without the archive log ( while databse still up and running) Oracle version is 8i not possible to drop datafile by sql.
in roll back segment I have 3 data files as below and the rb04.dbf is offline
usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs01.dbf
/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs03.dbf
/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf
sequence of what I did is below:
SQL> alter database datafile '/usr/Systems/1354RM_1/databases/dbsnml/data/rbs04.dbf' offline;
Database altered.
SQL> alter tablespace RBS rename datafile '/usr/Systems/1354RM_1/databases/dbsnml/data/rbs04.dbf' to '/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf';
Tablespace altered.
SQL> alter database datafile '/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf' online;
alter database datafile '/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf' online
ERROR at line 1:
ORA-01113: file 13 needs media recovery
ORA-01110: data file 13:
'/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf'
SQL> recover datafile '/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf';
ORA-00279: change 71449081 generated at 12/23/2008 20:18:05 needed for thread 1
ORA-00289: suggestion :
/usr/Systems/1354RM_1_7.1_Master/OSRES/data/warm_repl/WarmArchive/arch_1_455922.
arc
ORA-00280: change 71449081 for thread 1 is in sequence #455922
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00308: cannot open archived log
'/usr/Systems/1354RM_1_7.1_Master/OSRES/data/warm_repl/WarmArchive/arch_1_455922
.arc'
ORA-27037: unable to obtain file status
HP-UX Error: 2: No such file or directory
Additional information: 3

SQL> alter tablespace RBS rename datafile '/usr/Systems/1354RM_1/databases/dbsnml/data/rbs04.dbf' to '/usr/Systems/1354RM_1_7.1_Master/databases/dbsnml/data/rbs04.dbf';Did you rename the file at OS level after you issued above command? Oracle will not rename the file at OS level.
Other than that, if you plan to change rollback segment tablespace, better create a new one and create new rollback segment in new tablespace and drop the old one.

How to increase rollback segment

hi,
I am using oracle8i in solaris
I got a situation to increase rollback segment but i dont know how to do so?
can any one help me in solving this..........
I also want to know wat is the maximum max_extents size we can keep.....
This is my rollback segments
SQL> select segment_name, max_extents,TABLESPACE_NAME FROM dba_rollback_segs;
SEGMENT_NAME MAX_EXTENTS TABLESPACE_NAME
SYSTEM 121 SYSTEM
RBS 121 SYSTEM
RBS1 121 RBS
RBS2 121 RBS
RBS3 121 RBS
RBS4 121 RBS
RBS99 32765 RBS1
7 rows selected.
With Regards
Boo

If you have metalink access, there are really couple of good notes on how to tune and create optimal rollback segments.
Rollback Segment Configuration Tips Doc ID: Note:69464.1
Regarding the size of the rollback segment, it is depends on the nature of the application and the transaction size, whether short transaction or lenghty transactions.
If oltp with very small transaction, create rollback segment with very small value and make minextents 20, so that you dont need to have recursive call to create extents initially.
ORA-01628: max # extents (121) reached for rollback segment RBS1Make the extent unlimited.
ALTER ROLLBACK SEGMENT RBS1
STORAGE ( MAXEXTENTS UNLIMITED)
2) how many rollback segment can we hav?1 rollback segment = 4 concurrent transactions.
Now you decide, how many concurrent transaction do you have.
.3) what is the maximum extent size we can set?I would recommend to set the extent size according to nature of your application.
<<1) if there is more than one rollback segment in that, i want to know which one is active how to know this....... where to check this.........
SELECT r.name "RB NAME ", p.pid "ORACLE PID",
p.spid "SYSTEM PID ", NVL (p.username, 'NO TRANSACTION') "OS USER",
p.terminal
FROM v$lock l, v$process p, v$rollname r, v$session s
WHERE l.sid = s.sid(+)
AND s.paddr = p.addr
AND TRUNC (l.id1(+)/65536) = r.usn
AND l.type(+) = 'TX'
AND l.lmode(+) = 6
ORDER BY r.name;
Jaffar

How to make rollback segments online on database startup?

I create some rollback segments in users tablespace, but how can I auto make these rollback segment online on database startup?
thanks!!

Add the name of the rollback segments to rollback_segments parameter in the init.ora file.
edwin

How to create multiple segments on the target structure of an IDOC

Hi All
I am working on the Shipment Confirmation Interface( Message Type SHPCON ) which is FILE to IDOC Scenario. I have a segment called E1EDL18 which occurs only once on the target side of the idoc. Now I have to created multiple E1EDl18 segments for the Qualifiers ORI, PGI and PCK. I treid to send a constant ORI,PGI,PCK and then used an user defined function which splits the constant at COMMA and then I am assigning to the target field QUALF. In the display queue for QUALF I see three values with context but still only one E1EDL!* segment is created. Please let me know how to create multiple E1EDl18 segments for three qualifiers.
Thanks
Naga

In message Mapping, just right click on the segment and click on duplicate subtree. now it will create you another segment with same name and fields in it..
you can hard code the Qual, or you can map the required source field into it.

Oracle9i How to convert from undo tables to rollback segments

Hi,
Anyone try before converting from UNDO management to using rollback segment....What are the procedures for the conversion...
Thank You...

Hi,
Follow these steps to convert from Auto UNDO to Rollback Segs....
1. With the database opened, create a rollback tablespace and then create some rollback segments and bring them online like this
CREATE ROLLBACK SEGMENT RBS1 TABLESPACE RBS;
ALTER ROLLBACK SEGMENT RBS1 ONLINE;
2. Then edit the PFILE and modify these parameters
Add: ROLLBACK_SEGMENTS=(RBS1,RBS2,RBS3....)
Comment: UNDO_MANAGEMENT=AUTO and UNDO_TABLESPACE=UNDOTBS or whatever name you have for your UNDO tablespace.
3. Shutdown the database gracefully(normal).
4. Startup pfile=<Pfile path>
5. Sync these new parameter changes to the SPFILE by recreating the SPFILE.
6. Take a full level 0 backup of your database as the structure has changed.
The next time you start the database, it will use the SPFILE which is same as the PFILE.
Regards.

Can not create Rollback segment

Hi,
in 8i on Win 2003
unfortunately I have dropped rollback tablespace. Now when creating I receive ORA-01552 :
SQL> CREATE PUBLIC ROLLBACK SEGMENT "RBS1"
2      TABLESPACE "RBS"
3      STORAGE ( INITIAL 204k NEXT 10K MINEXTENTS 2 MAXEXTENTS
4      32);
CREATE PUBLIC ROLLBACK SEGMENT "RBS1"
ERROR at line 1:
ORA-01552: cannot use system rollback segment for non-system tablespace 'RBS'Any solution ?
Thank you.

@Satish,
DRSYS is one of the default tablespaces which used to come with the DBCA ,
http://download-west.oracle.com/docs/cd/A87860_01/doc/paraserv.817/a76934/chap1.htm#1014437
@OP,
Firrst thing is that you shouldn't create any segment , rollback or other in any system alike tablespace like DRSYS. You should create a seperate tablespace in which you should create the segments. As Satish asked already, there shouldn't be any problems as such but only the expectation of 1555 error due to the improper sizing of the rollback segments. But this is just a thought, it would be better if you explain your doubt(s) .
HTH
Aman....

Datafile containing rollback segment crashed

Hi,
In one of our production box (oracle 8.1.7.4 and HP UX), datafile containing rollback segment crashed. To open the database, i commented rollback segment line in init file and started the db and brought the crashed datafile to offline for dropping as
alter database datafile '/db10/rollback/rbs01.dbf' offline drop;
and then tried to drop the tablespace containing that datafile but it threw an error saying an active rollback segment R0 is still there in the tablespace. I donot know how to drop this and create new rollback segments. Any help would be greatly appreciated.
Thanks
Guna

Hi,
Serious case. In case of a failure the instance recovery is automatic but the rollback segments are needed. Having the database open does not mean everything is OK. Just read that :
Crash or instance recovery consists of the following steps:
+# Rolling forward to recover data that has not been recorded in the datafiles, yet has been recorded in the online redo log, including the contents of rollback segments. This is called cache recovery.+
+# Opening the database. Instead of waiting for all transactions to be rolled back before making the database available, Oracle allows the database to be opened as soon as cache recovery is complete. Any data that is not locked by unrecovered transactions is immediately available.+
+# Marking all transactions system-wide that were active at the time of failure as DEAD and marking the rollback segments containing these transactions as PARTLY AVAILABLE.+
+# Rolling back dead transactions as part of SMON recovery. This is called transaction recovery.+
+# Resolving any pending distributed transactions undergoing a two-phase commit at the time of the instance failure.+
+# As new transactions encounter rows locked by dead transactions, they can automatically roll back the dead transaction to release the locks. If you are using Fast-Start Recovery, just the data block is immediately rolled back, as opposed to the entire transaction.+
What did you do exactly after the crash ? Can you post commands/output + last 50-100 lines of your alert.log ?
Best regards
Phil

Increase the RollBack Segment

Guys,
Hope you all doing well.
My question is about the undotable space.
I am using oralce 9ir2 on Windows Plateform. The tablespace was auto created at database creation. The tablespace is in Auto undo Management mode. The Undotablespace has 10 Rollback segments. I want to increase the Rollback segments in the tablespace. How could i increase the rollback segments??
Please help.
Thanks
Y.Vo.

when I asked how to get the rollback segment count, I actually asked how would you get the rollback segments in undo tablespace. Because you dont have rollback segments in undo tablespace. You can either have rollback segments or undo tablespace. If you start your database in UNDO mode then you will have undo tablespace or in ROLLBACK mode you will have roll back segments. Both cannot be in the same place.
what version u are using? . In 10g you dont have rollback segment if you set UNDO_MANAGEMENT to auto. You will have only undotablespace.
1) In undotablespace the extents will automatically grow according to the sum of the data files for that tablespace.
2) If it reaches a maximum and if you have auto_extent in any one of the file then you dont have to manually increase the size i.e you dont have to manually increase the segments.
3) Also if you dont have the auto_extent in any file then the space will be reused. i.e you start to loose the old undo data.
4) The maximum data it can hold depends on UNDO_RETENTION period and the space available in the undo tablespace.
Hope this helps.

How to Create Exclusive Rollback Segment

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