Can size of RBS tablespace be reduced?

Hi folks.
Hope this is the right forum for this question.
Anyway, we're running Oracle 8.1.6 Standard Edition on Win NT
4.0. A few months ago, we ran a SQL Update statement on a table
with 176,000 rows and then did a Commit. As a result our RBS
(rollback?) tablespace grew quite large. Also, as a result, we
now do more frequent Commits. Anyway, my question is: can we
reduce the size of the RBS tablespace and if so how? I tried to
do it using DBA Studio but it wouldn't let me. Do I first have
to remove some Rollback Segments? (We have 6 now, each one 8,192
KB in size.)
Any hints, suggestions, etc. would be appreciated.
Thanks.

Hello Craig
To reduce the size of rollback segment you may issue the
following statement :
alter rollback segment <Segment-Name> shrink to <integer> K ;
If you have given the Optimal value for the specified Rollback
segment, you can shrink it to Optimal value as :
alter rollback segment <Segment-Name> shrink ;
Hope it will help you.
Manish Gupta

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Hi All,
Greetings,
Oracle 8.0.6
SunSolaris
My Rollbacksegment Tablespace datafile size is 1640 MB
but the actual used space is 217 MB.
is there any way to compress the size of 1640MB
Please Help me in this
Thanks in Advance
Adil

Hi,
01628, 00000, "max # extents (%s) reached for rollback segment %s"
// *Cause: An attempt was made to extend a rollback segment that was
// already at the MAXEXTENTS value.
// *Action: If the value of the MAXEXTENTS storage parameter is less than
// the maximum allowed by the system, raise this value. => Alter your RBS and allow more than 121 extents to be created in this RBS.
Also i found that RBS tablespace is marked as PERMANENT.Yes, it's normal.
..it means the rollback data does not get flushed out periodically?No
Also Should this tablespace be temporary? No, this can't be
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RBS tablespace abnormal growth

I am checking the tablespace size , i am seeing growht of RBS tablespace / it increases 297 MB in one day...Can any body tell me what is the reason & how i can solve that?

As you wish. You can put the other datafile to another disk. Oracle will stripe the data auomatically. Or you can enlarge your existing datafile if you don't have another disk to use.
Less datafiles means less administration effort. So you should trade off if it's worth to add a second or third datafile to your TEMP Tablespace. But more performance will perhaps also increase your salary ;-)
Dim

To shrink the size of TEMP tablespace

Dear all,
There is a databse with RAC, now in OEM the size of TEMP tablespace has been reached at 99.9%. now we want to shrink the size of TEMP tablespace.
how to we do that???????
plz help me...........

Temporary tablespaces usually show they are full, however this space is not actually in use. It is rather allocated. Oracle has evaluated the best way to obtain the most of performance, and he said it is better to allocate once than allocate-deallocate-reallocate extents, so temporary space is not 'released'.
If you want to feel psychologically more confortable with lower allocated space, you can drop your tablespace (create an interim default temporary tablespace first) and recreate it.
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alter tablespace temp add tempfile 'C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP01.dbf' size 32m;
SQL> select name from v$tempfile;
NAME
C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP.DBF
C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP01.DBF
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Setting the size of a tablespace prior to its creation

Hi guys,
Oracle version: 10.2.0.x
OS: Windows 32bit
I was wondering if there are any 'conditions' in setting the intial size of a tablespace prior to its creation. This is because, one of our customers wants to export and import from one schema into another but set an initial size for a tablespace during its creation and prior to importing data into it, but we have a database wizard tool that creates the accounts/schemas by using the following underlying sql:-
CRETE TABLESPACE <tbl_name> datafile <path><datafile_name>.dbf SIZE 100M AUTOEXTEND ON NEXT 100M MAXSIZE 32000M DEFAULT STORAGE (INITIAL 256 NEXT 256K MINEXTENTS 1 MAXEXTENTS UNLIMITED PCTINCREASE 0) ONLINE;
Under normal circumstances, what he would do is to use our wizard tool and create an account and then import data from an export dump.
But he wants to create a tablespace using a SQL something like:-
CRETE TABLESPACE <tbl_name> datafile <path><datafile_name>.dbf SIZE 2000M AUTOEXTEND ON NEXT 500M MAXSIZE 32000M DEFAULT STORAGE (INITIAL 256 NEXT 256K MINEXTENTS 1 MAXEXTENTS UNLIMITED PCTINCREASE 0) ONLINE;
He thinks this should be ok because his export dump would be on size 2GB and would want to import all of that 'at once' i.e. without actually using autoextend feature for the first 2GB.
Does this make any sense? Do you guys see any difference 'performance-wise' between the 2 create tablespace statements?
I think the second sql (with size 2000M initially) seems to be a more logical approach but I am not really sure of the implications going down the line performance-wise.
Any help/input much appreciated!
Thanks guys

1) Provide the facility in your tool to change the default size of datafiles and keep autoextend off.You won't believe it...we had this option in a previous version but now it isn't there anymore!
But why turning off AUTOEXTEND? I mean, our customers are not meant to modify anything in the database other than via using our software, hence we would want our customers to just use the software as it is but have their DBAs monitor the growth of any datafiles etc...
2) Let your tool do what it is doing and then manually increasing the size of the datafiles and making autoextend off once you have created the tablespace and before doing import. This can be done by your tool or loggin to the database.We could do this, but we don't want our customers to manually finger the database as they are/might not be Oracle-efficient and wouldn't want production systems to crash for the same reason.
Hence we could just give them the SQL to be replaced with the 'default' one and then create a tablespace via the tool which would create a tablespace with an initial size of 2GB+ and with greater autoextend facility (such as autoextend on 500M) rather than 100M so that there are fewer autoextends.
Also, in your point 2, are you saying to turn off autoextend only for the import and set it back on by alter tablespace....?
Thank you.

Size of temporary tablespace

Hi All ,
I try to create a temporary tablespace
1 create temporary tablespace test1
2 tempfile 'F:\datafile\test1.bdf'
3* size 500k
4 /
create temporary tablespace test1
ERROR at line 1:
ORA-03214: File Size specified is smaller than minimum required
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Hi,
You can test it by providing different sizes.
1 create temporary tablespace test1
2 tempfile 'F:\datafile\test1.bdf'
3* size 1024k
4 /
create temporary tablespace test1
ERROR at line 1:
ORA-03214: File Size specified is smaller than minimum required.
1 create temporary tablespace test1
2 tempfile 'F:\datafile\test1.bdf'
3* size 1050k
4 /
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So that means file size should be greater than 1024K.
Regards
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Size for TEMP tablespace

I don't know if this is a "valid" question. We have users running reports on our production system. The sometimes complain about the temp space being too small (due to their queries crashing when using too much temp space).
But I also have a feeling that you can keep throwing disks at TEMP space, and that it will never be enough.
What should the size of a database's TEMP space be - is there a rule of thumb for this ?
Dirk

There are several considerations that you should take into account when you try to size your temporary tablespace:
First, how much sort does you average transaction need and how many concurrent transactions does your system need to support. This number gives you a starting point for the minimum workable size for normal operations.
Now, how big is the largest table on your system and do you wish to be able to support select * from biggest order by ? Supporting an unqualified select on your largest table may not be required.
How big is the largest index in your system? It is likely that you need to have enough temp space available to recreate this index in the event of corruption without having to take special action to allocate more space to temp on a temporary basis. But having to add space in the event of a diaster might be acceptable.
Figure out what the largest sort operation you need to be able to support is and then add enough space to handle the number of concurrent average transactions that would be expected to be on the system at the same time. This is the size you should use for your temporary tablespace.
It is better to have all the space you will need for any normal and for any maintenance operation available at all time rather than trying to find additional file space to support special maintenance tasks or diaster recovery operations.
HTH -- Mark D Powell --

Can i recover a tablespace in diff database, is it possible ????

i am very frustated as i tried to bakup and recover a
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Step 9: Apply this command to see all the options of the export utility
C:\>
C:\>EXP HELP=Y
Export: Release 10.1.0.2.0 - Production on Fri Apr 23 19:48:30 2004
Copyright (c) 1982, 2004, Oracle. All rights reserved.
You can let Export prompt you for parameters by entering the EXP
command followed by your username/password:
     Example: EXP SCOTT/TIGER
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USERID     username/password          FULL         export entire file (N)
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LOG        log file of screen output STATISTICS   analyze objects (ESTIMATE)
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FILESIZE             maximum size of each dump file
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RESUMABLE_NAME       text string used to identify resumable statement
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http://otn.oracle.com/experts

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If I have full backup database, and next time database is failed.
Can I recover especially tablespace current data?
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I'm not sure, this are correct or not.
bash-2.05$ rman target / catalog user/password@rcat
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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ORA-01110: data file 5: '/data/db01/ORABK/perfstat.dbf'
any sugess please.
thank you
Suradech

M.Suradech wrote:
RMAN> alter database open resetlogs;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of alter db command at 06/04/2010 15:41:43
ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
ORA-01110: data file 5: '/data/db01/ORABK/perfstat.dbf'
any sugess please.
thank you
SuradechHi Suradech.This error(ORA-01157,ORA-01110) because in controlfile remain information about of '/data/db01/ORABK/perfstat.dbf'.Due to you restored controlfile from backup.You have to re-create controlfile or you can open database without this datafile.(Also there is YEAR2009' tablespaces datafile).You can try following.
1.
sqlplus "/as sysdba"
alter database datafile '/data/db01/ORABK/perfstat.dbf' offline drop;
alter database open;or
2.
sqlplus "/as sysdba"
alter database backup controlfile to trace as '/data/ctrl'; --then edit this file and remove '/data/db01/ORABK/perfstat.dbf' line(also YEAR2009`s datafile)
shutdown immediate;
startup nomount;
@/data/ctrl;
alter database open resetlogs; also see following metalink note.
How To Recover Database Where Backup Has Tablespace Excluded [ID 732627.1]
Ora-01157 When Running Recover Database Skip Forever Tablespace Noredo [ID 561440.1]

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Can size of RBS tablespace be reduced?

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