SYSTEM Tablespace Segment Management
When creating a new database (11.1.0.7) on AIX 5.3, what are the benefits of creating a SYSTEM tablespace with MANUAL segment management? This question may not be limited to 11g databases, but I was curious if the SYSTEM tablespace could be set to AUTO segement management and what drawbacks I might see in doing so?
Most of the databases I help manage have been established years ago and most, if not all, are set to MANUAL.
Thanks
This is the default. I do not think you or I know better than the Oracle designers ho to best setup the SYSTEM tablespace. You are best to leave it alone.
SQL> exec print_table('select * from dba_tablespaces where tablespace_name = ''SYSTEM''');
TABLESPACE_NAME : SYSTEM
BLOCK_SIZE : 8192
INITIAL_EXTENT : 65536
NEXT_EXTENT :
MIN_EXTENTS : 1
MAX_EXTENTS : 2147483645
MAX_SIZE : 2147483645
PCT_INCREASE :
MIN_EXTLEN : 65536
STATUS : ONLINE
CONTENTS : PERMANENT
LOGGING : LOGGING
FORCE_LOGGING : NO
EXTENT_MANAGEMENT : LOCAL
ALLOCATION_TYPE : SYSTEM
PLUGGED_IN : NO
SEGMENT_SPACE_MANAGEMENT : MANUAL
DEF_TAB_COMPRESSION : DISABLED
RETENTION : NOT APPLY
BIGFILE : NO
PREDICATE_EVALUATION : HOST
ENCRYPTED : NO
COMPRESS_FOR :
-----------------As you can see, SYSAUX is set up a bit different. System being special, you are best to leave it alone.
SQL> exec print_table('select * from dba_tablespaces where tablespace_name = ''SYSAUX''');
TABLESPACE_NAME : SYSAUX
BLOCK_SIZE : 8192
INITIAL_EXTENT : 65536
NEXT_EXTENT :
MIN_EXTENTS : 1
MAX_EXTENTS : 2147483645
MAX_SIZE : 2147483645
PCT_INCREASE :
MIN_EXTLEN : 65536
STATUS : ONLINE
CONTENTS : PERMANENT
LOGGING : LOGGING
FORCE_LOGGING : NO
EXTENT_MANAGEMENT : LOCAL
ALLOCATION_TYPE : SYSTEM
PLUGGED_IN : NO
SEGMENT_SPACE_MANAGEMENT : AUTO
DEF_TAB_COMPRESSION : DISABLED
RETENTION : NOT APPLY
BIGFILE : NO
PREDICATE_EVALUATION : HOST
ENCRYPTED : NO
COMPRESS_FOR :
-----------------
Similar Messages
-
Cannot use system rollback segment for non-system tablespace 'TEMP
Hi everyone!
I encountered this error: "Cannot use system rollback segment for non-system tablespace 'TEMP"
So this is what I did to check if the undo stuffs are online.
SQL> select tablespace_name,status from dba_tablespaces;
TABLESPACE_NAME STATUS
SYSTEM ONLINE
UNDO ONLINE
SYSAUX ONLINE
TEMP ONLINE
LARGEDATA ONLINE
LARGEINDEXES ONLINE
MEDIUMDATA ONLINE
MEDIUMINDEXES ONLINE
SMALLDATA ONLINE
SMALLINDEXES ONLINE
XSMALLDATA ONLINE
TABLESPACE_NAME STATUS
XSMALLINDEXES ONLINE
XXSMALLTABS ONLINE
USERS ONLINE
CONVTABLES ONLINE
UNDO_02 ONLINE
16 rows selected.
SQL> SELECT tablespace_name, sum((bytes/1024)/1024) free FROM DBA_FREE_SPACE gr
oup by tablespace_name;
TABLESPACE_NAME FREE
LARGEDATA 18.3105469
SMALLDATA 10.46875
SYSAUX 106.5625
UNDO_02 67.125
XXSMALLTABS 13.0078125
CONVTABLES 170.039063
MEDIUMDATA 22
USERS 37.265625
SYSTEM 55.875
LARGEINDEXES 30.5175781
XSMALLINDEXES 17.34375
TABLESPACE_NAME FREE
UNDO 546.9375
MEDIUMINDEXES 33.25
SMALLINDEXES 31.015625
XSMALLDATA 23.6328125
15 rows selected.
SQL> select file#,status from v$datafile;
FILE# STATUS
1 SYSTEM
2 ONLINE
3 ONLINE
4 ONLINE
5 ONLINE
6 ONLINE
7 ONLINE
8 ONLINE
9 ONLINE
10 ONLINE
11 ONLINE
FILE# STATUS
12 ONLINE
13 ONLINE
14 ONLINE
15 ONLINE
15 rows selected.
SQL> select segment_name, tablespace_name, initial_extent,status
2 from dba_rollback_segs;
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
SYSTEM SYSTEM 102400
ONLINE
_SYSSMU1$ UNDO 131072
OFFLINE
_SYSSMU2$ UNDO 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU3$ UNDO 131072
OFFLINE
_SYSSMU4$ UNDO 131072
OFFLINE
_SYSSMU5$ UNDO 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU6$ UNDO 131072
OFFLINE
_SYSSMU7$ UNDO 131072
OFFLINE
_SYSSMU8$ UNDO 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU9$ UNDO 131072
OFFLINE
_SYSSMU10$ UNDO 131072
OFFLINE
_SYSSMU11$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU12$ UNDO_02 131072
OFFLINE
_SYSSMU13$ UNDO_02 131072
OFFLINE
_SYSSMU14$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU15$ UNDO_02 131072
OFFLINE
_SYSSMU16$ UNDO_02 131072
OFFLINE
_SYSSMU17$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU18$ UNDO_02 131072
OFFLINE
_SYSSMU19$ UNDO_02 131072
OFFLINE
_SYSSMU20$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU21$ UNDO_02 131072
OFFLINE
22 rows selected.How should I be bringing them online?
I tried this but didn't work for me.
SQL> alter rollback segment _SYSSMU1$ online;
alter rollback segment _SYSSMU1$ online
ERROR at line 1:
ORA-00911: invalid character
SQL> alter rollback segment '_SYSSMU1$' online;
alter rollback segment '_SYSSMU1$' online
ERROR at line 1:
ORA-02245: invalid ROLLBACK SEGMENT name
SQL> alter rollback segment _SYSSMU21$ online;
alter rollback segment _SYSSMU21$ online
ERROR at line 1:
ORA-00911: invalid character
SQL> alter rollback segment SYSSMU21$ online;
alter rollback segment SYSSMU21$ online
ERROR at line 1:
ORA-01534: rollback segment 'SYSSMU21$' doesn't exist
SQL> alter rollback segment '_SYSSMU21$' online;
alter rollback segment '_SYSSMU21$' online
ERROR at line 1:
ORA-02245: invalid ROLLBACK SEGMENT name
SQL> alter rollback segment "_SYSSMU21$" online;
alter rollback segment "_SYSSMU21$" online
ERROR at line 1:
ORA-30017: segment '_SYSSMU21$' is not supported in MANUAL Undo Management mode
SQL> ALTER SYSTEM SET UNDO_MANAGEMENT=AUTO SCOPE=SPFILE;
System altered.Should I be bringing every segment online separately? Please guide me.
Nith
Edited by: user645399 on Feb 23, 2011 2:52 PMSQL> select segment_name, tablespace_name, initial_extent,status
2 from dba_rollback_segs;
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
SYSTEM SYSTEM 102400
ONLINE
_SYSSMU1$ UNDO 131072
ONLINE
_SYSSMU2$ UNDO 131072
ONLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU3$ UNDO 131072
ONLINE
_SYSSMU4$ UNDO 131072
ONLINE
_SYSSMU5$ UNDO 131072
ONLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU6$ UNDO 131072
ONLINE
_SYSSMU7$ UNDO 131072
ONLINE
_SYSSMU8$ UNDO 131072
ONLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU9$ UNDO 131072
ONLINE
_SYSSMU10$ UNDO 131072
ONLINE
_SYSSMU11$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU12$ UNDO_02 131072
OFFLINE
_SYSSMU13$ UNDO_02 131072
OFFLINE
_SYSSMU14$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU15$ UNDO_02 131072
OFFLINE
_SYSSMU16$ UNDO_02 131072
OFFLINE
_SYSSMU17$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU18$ UNDO_02 131072
OFFLINE
_SYSSMU19$ UNDO_02 131072
OFFLINE
_SYSSMU20$ UNDO_02 131072
OFFLINE
SEGMENT_NAME TABLESPACE_NAME INITIAL_EXTENT
STATUS
_SYSSMU21$ UNDO_02 131072
OFFLINEStill undo_02's segments are offline. -
Error:cannot use system rollback segment for non-system tablespace
Hi,
I have created a oracle database 10.2.0 on fedora 9 system. I have created a user and assigned the default tablespace SATYA and given the permissions. But when I create a table in the user I am getting the following error.
Can anyone help me in rectifying this error.
ORA-01552: cannot use system rollback segment for non-system tablespace 'SATYA'
thankyou
satyaUndo management is either AUTO or Manual, no local
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/undo.htm#sthref1469
Since you are using 10g, you are recommended to use Auto undo management
If you still plan to use manual undo management, make sure you have other non-system rollback segment in place. -
System tablespace management in oracle 9i
Hi,
I would like to know whether system tablespace in oracle 9i by default is locally managed or dictionary managedHi,
I would like to know whether system tablespace in oracle 9i by default is locally managed or dictionary managed SYSTEM tablespace in 9i rdbms can ONLY be dictionary managed. -
SYSTEM tablespace rollback segment
Hi, i had taken a tablespace offline. so the active transactions data will go to SYSTEM rollback segment.
SYSTEM tablespace will use this rollback segments for transactions instead of undo. am i right?
now i dropped the tablespace. so how much time the data which is there in system rollback segments exists? will that data will be overrided because of other transactions on system tablespace?(think that i don't require that tablespace so i dropped it)
thanks in advanceplease anybody post the answer
-
ORA-01552: cannot use system rollback segment for non-system tablespace
i try to create a table in new schema test1 and got the following error. please help.
SQL> create table employer1 as select * from a.employer;
create table employer1 as select * from a.employer
ERROR at line 1:
ORA-01552: cannot use system rollback segment for non-system tablespace 'TEST1'Hi,
This is an example:
SQL>
CREATE UNDO TABLESPACE "UNDOTMP"
DATAFILE 'UNDOTMP.DBF01' SIZE 100M REUSE
AUTOEXTEND ON NEXT 51200K MAXSIZE 15000M
ALTER SYSTEM SET undo_tablespace=UNDOTMP SCOPE=BOTH;
Regards
David Duenas
Edited by: David Duenas on Jul 4, 2009 7:33 PM -
Cannot use system rollback segment for non-system tablespace
I am getting the below error suddently
ORA-01552: cannot use system rollback segment for non-system tablespace 'USERS'SQL> show parameter undo
Version : Oracle 10g
NAME TYPE VALUE
undo_management string AUTO
undo_retention integer 10800
undo_tablespace string UNDO
SQL>
SQL> select distinct tablespace_name, status from dba_rollback_segs
2 ;
TABLESPACE_NAME STATUS
SYSTEM ONLINE
UNDO OFFLINE
UNDO ONLINE -
System tablespace space not regained when objects are dropped
Mine is a Oracle 10g 10.2 on windows.
I am importing a export file into a user ,It takes some amount of space in SYSTEM and another tablespace .When I drop the user space in system tablespace is not coming back. ANY IDEA WHY
BEFORE IMPORT
SQL> select sum(bytes)/1024/1024 from dba_segments where owner='SYSTEM';
SUM(BYTES)/1024/1024
22.1875
SQL> select sum(bytes)/1024/1024 from dba_segments where owner='SYS';
SUM(BYTES)/1024/1024
544.1875
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name='SOURCE$';
SUM(BYTES)/1024/1024
41
I use the following commands to import
SQL>create user <username> identified by <password> default tablespace <tsname> quota unlimited on <tsname>;
SQL>grant create session,imp_full_database to <username>;
imp system file=filename.dmp log=logname.log fromuser=<username> touser=<username> statistics=none
AFTER IMPORT
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name='SOURCE$';
SUM(BYTES)/1024/1024
53
SQL> select sum(bytes)/1024/1024 from dba_segments where owner='SYSTEM';
SUM(BYTES)/1024/1024
22.1875
SQL> select sum(bytes)/1024/1024 from dba_segments where owner='SYS';
SUM(BYTES)/1024/1024
728.375
AFTER DROPPING THE USER/SCHEMA
SQL> select sum(bytes)/1024/1024 from dba_segments where owner='SYS';
SUM(BYTES)/1024/1024
728.375
SQL> select sum(bytes)/1024/1024 from dba_segments where owner='SYSTEM';
SUM(BYTES)/1024/1024
22.1875
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name='SOURCE$';
SUM(BYTES)/1024/1024
53
I even tried deleting the objects first and then dropping the user
SQL> delete from source$ where obj# in(select object_id from dba_objects where owner='USERNAME');
211252 rows deleted.
SQL> commit;
Commit complete.
SQL> drop user USERNAME cascade;
User dropped.
The space used by the schema on system tablespace is not coming back.Hi user509593!
Adding objects to a tablespace requires space in that tablespace. This space is managed in segments and extents. If an extent is fully used (that means 100 % usage) a new extent will be added to a segment. Oracle uses a mechanism called "High Water Mark" to mark the last used extent.
Your problem is that oracle don't set this High Water Mark back if you are dropping objects from a tablespace. Once an extent is marked as it it retains marked as used.
Before Adding Objects:
u = used Extent
x = free Extent
| = High Water Mark
uuuuuuxxxxx
...........|
After Adding Objects:
uuuuuuuxxxx
............|
After dropping objects:
uuuuuuuxxxx
............|
The only chance to get your "unused" space back is to reorganized your tablespace. But before you reorganize something please read the documentation to know all about the costs and traps that comes with reorganization.
Hope this help!
null -
Migrating SYSTEM tablespace from DMTS to LMTS in Oracle 9.2.0.7
Migrating SYSTEM tablespace from DMTS to LMTS in Oracle 9.2.0.7 using
brspace -f dbcreate
SAP version: 4.6C
Oracle: 9.2.0.7
OS: AIX 5.3
BRTools: 6.40(42) /** 6.40(10) or (12) will be sufficient according to SAP ***/
IMPORTANT ***************************************
MUST DO:
1. Create a Full Backup of your system
2. Test your Restore and recovery of your backup.
3. Have a copy of all your tablespaces names on hand
4. Know your SYS and SYSTEM passwords
5. Run CheckDB in DB13 to ensure it is completed successfully with no warnings. This reduce the chance of hitting errors in the process
6. Ensure your UNDO tablespace is big enough
7. OSS 400241 Problems with ops$ or sapr3 connect to Oracle
NOTE: OSS 706625(Read this note)
The migration from a dictionary-managed SYSTEM tablespace to a locally-managed tablespace using the PL/SQL procedure DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL is not supported in the SAP environment.
In UNIX, logon as ora<sid>
run command: brspace -f dbcreate
This command will triggers a Menu. The are seven(7) steps to complete the whole process. Do them in sequence, from step 1 to step 7 faithfully. In Step 1, ensure that your settings of PSAPTEMP, PSAPUNDO etc details such as filenames are correct. The rest I leave it as default and they are fine. Do not change redo log group from 8 to 4 even if you only have 4 redo groups. If not, you might need to restore the system! If the seven steps are complete without errors(warnings is acceptable), congrats. Perform a backup again.
Problems I encountered that caused me to restore system:
1./ Problem: I changed the redo group from 8 to 4 and in the later stage after the tablespaces and files are dropped, the system prompted me that 4 is not acceptable! I can't go back then so a restore is performed.
Solution: Leave the default value 8 as it is
2./ I was using wireless network and the network breaks thus process breaks.
Solution: This process in user-interactive and requires you to input confirmation along the way so do it using LAN.
3./ In the process of dropping tablespace PSAP<SID>, I encountered:
BR0301E SQL error -604 at location BrTspDrop-2
ORA-00601: error occurred at recursive SQL level 1
ORA-01555: snapshot too old: rollback segment number 22 with name '_SYSSMU22$" too small
Solution: I have not fixed this yet but I think it is because my PSAPUNDO is too small(800M) so I will increase it to a bigger value e.g. 5GB
4. Problem: Unable to start sap after successfully migrated. OPS$user problem
Solution: logon as <sid>adm, run R3trans -x in a directory that <sid>adm has read/write permission. R3trans -x will creates a file call trans.log. Read the details and refer to OSS 400241
Result: I have successfully performed this on one(1) system and doing this on the another one currently but encounter Problem 3. Will update this further if there are more findings.
REFERENCE:
OSS 748434 New BRSPACE function "dbcreate" - recreate database
OSS 646681 Reorganizing tables with BRSPACE
OSS 541538 FAX: Reorganizations
Message was edited by:
Annie Chan
Message was edited by:
Annie Chan
Message was edited by:
Annie ChanThe current one I am implementing is a development system. The database is less than 100GB. 800MB of PSAPUNDO is sufficient for our development usage.
Follow up on Problem 3:
I created another undo tablespace PSAPUNDO2(undodata.dbf) with size of 5GB. I switched undo tablespace to PSAPUNDO2 and placed PSAPUNDO(undo.data1) offline. With PSAPUNDO2 online and PSAPUNDO offline, I started brspace -f dbcreate and encountered the error below at Step 2 Export User tablespace:
BR0301E SQL error -376 at location BrStattabCreate-3
ORA-00376: file 17 cannot be read at this time
ORA-01110: data file 17: '/oracle/DVT/sapdata1/undo_1/undo.data1'
ORA-06512: at 'SYS.DBMS_STATS", line 5317
ORA-06512: at line 1
I aborted the process and verified that SAP is able to run with this settings. I started CheckDB in DB13 and it shows me these messages:
BR0301W SQL error -376 at location brc_dblog_open-5
ORA-00376: file 17 cannot be read at this time
ORA-01110: data file 17: '/oracle/DEV/sapdata1/undo_1/undo.data1'
BR0324W Insertion of database log header failed
I don't understand then. I have already switched the undo tablespace from PSAPUNDO to PSAPUNDO2. Why the message above still appears? Once I put PSAPUNDO online, CheckDB completes successfully without warning.
I did show parameter undo_tablespace and the result is PSAPUNDO2(5GB).
So exactly, what's going on? Can anyone advise?
===============================================
I have managed to clear the message in DB13 after dropping PSAPUNDO tablespace including contents and datafiles. This is mentioned is OSS note 600141 pg 8 as below:
Note: You cannot just set the old rollback-tablespace PSAPROLL to offline instead of deleting it properly. This results in ORA-00376 in connection with ORA-01110 error messages. PSAPROLL must remain ONLINE until it is deleted. (Oracle bug 3635653)
Message was edited by:
Annie Chan -
SYSTEM Tablespace issue (10.2.0.1 database)
Hi ,
Oracle database 10.2.0.1 (upgraded from 8.1.7.0 via 8.1.7.4)...successfully upgraded
Now when we open dbcontrol, we are getting alerts regarding the Tablespace.
It shows two critical alert messages as below :-
1) Tablesapace SYSTEM (dictionary managed) is 95.16 % full
2) 1 segment in SYSTEM tablespace is unable to extend.
Now how to deal with this type of issues ?
Can we extend the size of datafile of SYSTEM Tablespace which is dictionary managed ? or can we add another new datafile to system tablespace ? what is appropriate solution ?SYSTEM Tablespace
How to solve the point no. (2) as the TS is dictionary managed ?
With Regardshi ,
Plz add the datafile to the system tablespace tp increase its size , and the conver the system tablespace from dictionary managed to local.
To Change SYSTEM tablespaces to locally managed follow the below procedures:
Before the SYSTEM tablespace can be migrated to locally managed format, you should ensure the following:
The database has a default temporary tablespace which is not SYSTEM
There are not any rollback segments in dictionary managed tablespaces
There is at least one online rollback segment in a locally managed tablespace, or an undo tablespace (if using automatic undo management mode) should be online.
All tablespaces other than the tablespace containing the undo space (undo tablespace or the tablespace containing the rollback segment) and the default temporary tablespace are in read-only mode.
There is a complete backup of the system.
The system is in restricted mode.
Notr, that we already have an UNDO Tablespace. The following query determines whether the SYSTEM tablespace is locally managed:
SQL> SELECT ts# FROM ts$ WHERE ts# = 0 AND bitmapped <> 0;
If 0 rows are returned, then the SYSTEM tablespace is dictionary managed. Otherwise, the SYSTEM tablespace is locally managed.
Steps to change SYSTEM tablespaces to locally managed
SQL> shutdown immediate
SQL> startup restrict
SQL> execute DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL ('SYSTEM');
ERROR at line 1:
ORA-10644: SYSTEM tablespace cannot be default temporary tablespace
ORA-06512: at "SYS.DBMS_SPACE_ADMIN", line 227
ORA-06512: at line 1
SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp;
SQL> execute DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL ('SYSTEM');
ERROR at line 1:
ORA-10647: Tablespace other than SYSTEM, UNDO, TEMP not
found in read only mode
ORA-06512: at "SYS.DBMS_SPACE_ADMIN", line 227
ORA-06512: at line 1
SQL> select tablespace_name from dba_tablespaces;
TABLESPACE_NAME
SYSTEM
TEMP
USERS
TAB
IDX
SYSAUX
UNDO
SQL> alter tablespace USERS read only;
SQL> alter tablespace TAB read only;
SQL> alter tablespace IDX read only;
SQL> execute DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL ('SYSTEM');
ERROR at line 1:
ORA-10648: Tablespace SYSAUX is not offline
ORA-06512: at "SYS.DBMS_SPACE_ADMIN", line 227
ORA-06512: at line 1
SQL> alter tablespace SYSAUX offline;
SQL> execute DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL ('SYSTEM');
PL/SQL procedure successfully completed.
Regards,
Mohd Mehraj Hussain
http://mehrajdba.wordpress.com -
hello all,
I created a new Oracle 11gR2 11.2.0.3.
i am checking the Oracle Enterprise manager, i saw the my system tablespace size is 700 M and it is 99% full.
Do i have to re size system tablespace datafile?
does that affect my database, do i have to restart it ?
99% full of system table space will affect my database performance?
How can I specify the best size of my system tablespace?
Regards,That does seem to be the size system tablespace you get with a new db. After a couple of years, mine is still that size, though it appears something has come and gone, but I don't really care.
Recent versions separate out various things into the sysaux tablespace. You do have to watch out that it doesn't start growing. dbconsole has an interesting tablespace map (and there are command lines ways also) to see what segments are in tablespaces. Don't worry too much about any apparent "fragmentation" (and I use that word loosely, and probably shouldn't) you see in the mapping of segments, but it is useful to be aware [url http://docs.oracle.com/cd/B28359_01/server.111/b28310/create004.htm#i1011308]what is in sysaux and why it might start growing. Autoextend is perfectly fine for these tablespaces.
Edit: Auditing is special, and may cause the system tablespace to grow under certain circumstances.
Edited by: jgarry on Apr 11, 2012 3:27 PM -
Temp usage in system tablespace
Hi
I have oracle 9i with dictionary managed tablespaces.
I have put a trigger to capture sql statement which cause temp errors.
Recently, I have found out that the below sql cause:
ORA-1652: unable to extend temp segment by 5394 in tablespace SYSTEM
select distinct i.*
from PREM i, Summ p
WHERE i.Contract_Branch_Id = p.Pol_Branch_Id
AND i.Product_Code = p.Product_Code
AND i.Contract_Pol_No = p.Pol_No
AND p.Transaction_Type = 'V23'
AND p.Accounting_Prd IN
(TO_NUMBER(TO_CHAR(ADD_MONTHS(SYSDATE, -1),'YYYYMM')), TO_NUMBER(TO_CHAR(SYSDATE, 'YYYYMM')))My question is, how come such a sql uses temp segments in System tablespace rather than normal temp tablespace ?in sqlplus do the following
SET AUTOTRACE TRACEONLY EXPLAIN STATISTICS
select distinct i.*
from PREM i, Summ p
WHERE i.Contract_Branch_Id = p.Pol_Branch_Id
AND i.Product_Code = p.Product_Code
AND i.Contract_Pol_No = p.Pol_No
AND p.Transaction_Type = 'V23'
AND p.Accounting_Prd IN
(TO_NUMBER(TO_CHAR(ADD_MONTHS(SYSDATE, -1),'YYYYMM')), TO_NUMBER(TO_CHAR(SYSDATE, 'YYYYMM')))
post FORMATTED results back here -
Hi,
I managed a 9.2.0.1 database located on Solaris 9 and I receive an error message which scared me !! Could you help me?
"2 segments in SYSTEM tablespace unable to extend"
Thanks !
Davidhi dav,
Could you post the out put of this pl?
df-k /u02/oradata/MVXREEL
& run the given query and post the out put pl.
set pagesize 100
set linesize 150
select
f.tablespace_name,
a.total "TotAlloc_In_MB",
u.used "TotUsd_In_MB",
f.free "TotFree_In_MB",
round((u.used/a.total)*100) "% used" ,
round((f.free/a.total)*100) "% Free"
from
(select tablespace_name, sum(bytes/(1024*1024)) total from dba_data_files group by tablespace_name) a,
(select tablespace_name, round(sum(bytes/(1024*1024))) used from dba_extents group by tablespace_name) u,
(select tablespace_name, round(sum(bytes/(1024*1024))) free from dba_free_space group by tablespace_name) f
where a.tablespace_name = f.tablespace_name
and a.tablespace_name = u.tablespace_name
and a.tablespace_name='SYSTEM'
order by 6 desc;
cheers,
kamalesh jk -
Manual Segment Management - Learning Question
I'm currently trying to learn as much as I can and am still new at it. Does anyone know of a good book or link that talks about manual segment management? Most of what I have found is a very short blurb that doesn't really discuss specifics. I would like to know what tasks a dba needs to regularly do when a tablespace is set up as manual.
I feel pretty confused and have a specific question*. Sorry if it is a dumb question... I know a lot of you don't like questions that you feel are beneath you. If you don't like the question, please just ignore it and don't gripe me out.
If the datafile is set to autoextend and the segment management is manual and the extent management is local is there any specific task a dba needs to perform for autoextend to work? ( I guess the mixing of manual and auto terms is kind of confusing me) In this specific instance I am most interested in the system tablespace specifically (the dev box I'm learning on is setup that way).
thanks in advance to those with patience to answer someone who is learning,
CaraYou should not be creating any object in the system tablespace. All user objects should be in the users tablespace, or other tablespace created for the purpose.
The only objects in the system tablespace are those created by the Oracle install scripts (e.g $ORACLE_HOME/rdbms/admin/catalog.sql) , and you really should not be making changes to them unless recommended by Oracle Support, install document, patch document etc. The only thing you need to check is to either :-
1. make sure there is free space in the system tablespace by resizing the datafiles (select from dba_free_space and dba_data_files)
or
2. make sure autoextend is turned on for one system tablespace datafile with proper maxbytes and increment_by, and sufficient free space on disk for the file to extend. -
How to change manual segment management to automatic? and vice versa
how to change manual segment management to automatic? and vice versa
i can't find any option for that in EM
ThanksPaolo Marin,
The original wants to change from Freelist management to Automatic Segment Space management - the URL you supplied is about converting from Dictionary Managed tablespaces (DMT) to Locally Managed tablespaces (LMT).
In passing - the article you reference says: First, MAKE sure to take a full backup of the tablespace and all related tablespaces (inter-tablespace referential integrity) before running this procedure:. There's no such thing as 'tablespace referential integrity', but (a) it would be a good idea to make sure that no-one else is using the database whilst you do a conversion, and (b) it's the system tablespace that holds the data dictionary so that's the one other (really important) tablespace you have to back up before starting.
There is a very old note about the limitations of doing the DMT -> LMT conversion here: http://www.jlcomp.demon.co.uk/book_8i/ch_08.html#Extent%20Management
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
https://www.jlcomp.demon.co.uk
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