Why increase sysaux tablespace

Hi Experts,
I have a bi-direction oracle 10GR2 stream in window 2003.
I got a error message in alert.
error 12801 in STREAMS process
ORA-12801: error signaled in parallel query server P000
ORA-01653: unable to extend table SYS.STREAMS$_APPLY_SPILL_MESSAGES by 8192 in tablespace SYSAUX
OPIRIP: Uncaught error 447. Error stack:
ORA-00447: fatal error in background process
ORA-12801: error signaled in parallel query server P000
ORA-01653: unable to extend table SYS.STREAMS$_APPLY_SPILL_MESSAGES by 8192 in tablespace SYSAUX
The sysaux has data file as 32718.00MB after filled, i added other datafil as12767 MB. it will be fill soon.
I want to know why it fill it so fast? do we need to shut down instance for this issue?
or just added addtional datafile? what issue is for our stream?
The othe rA DB server( input more data than this server ) does not have large size sysaux tbs.A Db server had shut down 2 times in past months
Thanks for help
Jim

Spilled messages (of that kind) are messages that are dequeued and stored on disks by the apply process. It happens when messages are in the queue for too long or consuming too much memory. That has several drawbacks (1) spilled messages are logged in the target database, you don't benefit anymore from the fact messages are usually in-memory and (2) You consume space in the partitioned table you've shown. On the other hand you don't have an unlimited set of memory and you must have a mechanism to release some.
An easy way to get messages spilled is to modify a large amount of data on the source on one transaction or leave uncommitted transactions. You can get data about the source transactions that generated those messages in DBA_APPLY_SPILL_TXN or directly in SYS.STREAMS$_APPLY_SPILL_MSGS_PART. You can use the the procedure Oracle provides in the doc to display the content of the messages.
Try to identify why you get those message and shorten transactions on the source. Make sure you run the recommended patches on top of 10.2.0.4 too. There are several known in that area.

Similar Messages

Sysaux tablespace is getting full

Hi,
can anyone help me find out why my sysaux tablespace is getting full?
Regards

Hi,
The datafiles of System ,and Sysaux tablespaces are in AUTIEXTEND ON mode by default.
To findout what object is occupying the space
SELECT OCCUPANT_NAME,OCCUPANT_DESC,SCHEMA_NAME,MOVE_PROCEDURE,SPACE_USAGE_KBYTES from V$SYSAUX_OCCUPANTS;

SYSAUX tablespace increasing in size

Hi,
I have noticed that SYSAUX tablespace increasing in size. This tablespace is being used by the below components. However, none of those components are used by my applications. They are installed by default with Oracle 10g Realese1. what makes this tablespace increase?? and what should be done to stop increasing in this tablespace?
Oracle Ultra Search 10.1.0.3.0 VALID WKSYS
Oracle Enterprise Manager 10.1.0.3.0 VALID SYSMAN
Oracle XML Database 10.1.0.3.0 VALID XDB
OLAP Catalog 10.1.0.3.0 VALID OLAPSYS
Oracle Text 10.1.0.3.0 VALID CTXSYS
Spatial 10.1.0.3.0 VALID MDSYS
Oracle interMedia 10.1.0.3.0 VALID ORDSYS
Oracle Expression Filter 10.1.0.3.0 VALID EXFSYS
Oracle Workspace Manager 10.1.0.2.0 VALID WMSYS
Oracle Data Mining 10.1.0.3.0 VALID DMSYS

The following is from a metalink post of mine on the same subject>>
The sysaux tablespace is used to hold AWR data among other uses. Reduce the retention and interval setting for the AWR snapshots to reduce the space necessary to hold the data. See dbms_workload_repository package procedure modify_snapshot_settings.
Your statistics collection level will also feed into the above.
Take a look at other features/products you have assigned to sysaux if any and examine the data collection and retention rules you have specified for them.
<<
HTH -- Mark D Powell --

Sysaux Tablespace keep on increasing

Sysaux tablespace keeps on increasing not able to control it, am keep on adding datafiles to control it but its keep on growing. Please tell me some suggestion.
Edited by: 992890 on Mar 10, 2013 5:07 AM

Hi
I have executed the following query and attached the output
select * from DBA_HIST_WR_CONTROL;
DBID     SNAP_INTERVAL     RETENTION     TOPNSQL
3471086047     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
3,944,815,540     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
2,882,923,506     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
1,387,452,485     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
2,061,558,320     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
4,288,048,108     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
3,558,022,128     +00 01:00:00.000000     +07 00:00:00.000000     DEFAULT
412,070,703     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
3,516,040,524     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
3,580,520,771     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
2,350,953,892     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
3,922,397,616     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
3,923,062,658     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
217,995,194     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
218,007,544     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
2,106,485,754     +00 01:00:00.000000     +08 00:00:00.000000     DEFAULT
Regards
Sham

How to release space of SYSAUX tablespace

Hi,
I am now using htmldb 2.0 and created tens of tables in one schema. Several tables are stored in tablespace SYSAUX. Since now I am trying to store a big file to the table(1GB), I found the tablespace grows pretty fast and I have to extend the size. The odd thing is when I delete that file from my table, SYSAUX tablespace seems not release any room and when I insert the big file again into the table, SYSAUX grows again. How can I release the space then? I can't image that why it can't release any room. I also check the occupants of SYSAUX and found one occupant called "other" takes over 90% of space. I tried to move it out of SYSAUX, it doesn't work. What do "other" do actually? I got completely lost. Any help will be greatly appreciated.
Linke

Hi,
if you drop a table in Oracle 10g,
you will find teh extents of this table in
DBA_FREE_SPACE.
in DBA_FREE_SPACE???
I don't think so.
SQL >select ddf.tablespace_name,round(total/1024/1024,3) ttlSize,round((total-nvl(freespace,0))/1024/1024,3) used, round((total-nvl(freespace,0))/total*100,2) usedpct
from
(select tablespace_name,sum(bytes) total from dba_data_files group by tablespace_name) ddf,
(select tablespace_name,sum(bytes) freespace from dba_free_space group by tablespace_name) dfs
where ddf.tablespace_name=dfs.tablespace_name(+) and ddf.tablespace_name='USERS';
TABLESPACE_NAME                   TTLSIZE       USED    USEDPCT
USERS                                  16      2.813 17.58
SQL >create table test (col1 number) storage(initial 2m)
2 /
Table created.
SQL >select ddf.tablespace_name,round(total/1024/1024,3) ttlSize,round((total-nvl(freespace,0))/1024/1024,3) used, round((total-nvl(freespace,0))/total*100,2) usedpct
from
(select tablespace_name,sum(bytes) total from dba_data_files group by tablespace_name) ddf,
(select tablespace_name,sum(bytes) freespace from dba_free_space group by tablespace_name) dfs
where ddf.tablespace_name=dfs.tablespace_name(+) and ddf.tablespace_name='USERS';
TABLESPACE_NAME                   TTLSIZE       USED    USEDPCT
USERS                                  16      4.813 30.08<--used 2mb
SQL >select sum(bytes)/1024/1024 from dba_segments where tablespace_name='USERS'
2 /
SUM(BYTES)/1024/1024
                6.75
SQL >drop table test
2 /
Table dropped.
SQL >select sum(bytes)/1024/1024 from dba_segments where tablespace_name='USERS'
2 /
SUM(BYTES)/1024/1024
                6.75 <-- kept in the same tablespace

What is the use of SYSAUX Tablespace in Oracle 10G

Dear Experts,
Please Tell me What is the use of SYSAUX Tablespace in Oracle 10G Because
during Web Load Testing It is going to increase countinuosly.Although i am not using this with any tables.
How Can I find out the what is gong on in this.
Can I Remove this tablesspace and other non using Schemas like FLOWS_020100,MDSYS,OUTLN,DIP and TSMSYS etc.

What is SYSAUX?
The SYSAUX tablespace provides storage of non-sys-related tables and indexes that traditionally were placed in the SYSTEM tablespace. For example, the tables and indexes that were previously owned by the system user can now be specified for a SYSAUX tablespace. Unfortunately, Oracle still places the SCOTT schema and the other demonstration schemas in the SYSTEM tablespace. Go figure.
The SYSAUX tablespace is specified with the CREATE DATABASE command. This is demonstrated in the example database creation script in Figure 1.1.
CREATE DATABASE test
MAXINSTANCES 1
MAXLOGHISTORY 1
MAXLOGFILES 5
MAXLOGMEMBERS 3
MAXDATAFILES 100
DATAFILE '/usr/oracle/OraHome1/oradata/aultdb1/test/system01.dbf' SIZE 300M REUSE AUTOEXTEND ON NEXT 10240K MAXSIZE UNLIMITED
EXTENT MANAGEMENT LOCAL
SYSAUX DATAFILE '/usr/oracle/OraHome1/oradata/aultdb1/test/sysaux01.dbf' SIZE 120M REUSE AUTOEXTEND ON NEXT 10240K MAXSIZE UNLIMITED
DEFAULT TEMPORARY TABLESPACE TEMP TEMPFILE '/usr/oracle/OraHome1/oradata/aultdb1/test/temp01.dbf' SIZE 20M REUSE AUTOEXTEND ON NEXT 640K MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL
UNDO TABLESPACE "UNDOTBS1" DATAFILE '/usr/oracle/OraHome1/oradata/aultdb1/test/undotbs01.dbf' SIZE 200M REUSE AUTOEXTEND ON NEXT 5120K MAXSIZE UNLIMITED
CHARACTER SET WE8ISO8859P1
NATIONAL CHARACTER SET AL16UTF16
LOGFILE GROUP 1 ('/usr/oracle/OraHome1/oradata/aultdb1/test/redo01.log') SIZE 10240K,
GROUP 2 ('/usr/oracle/OraHome1/oradata/aultdb1/test/redo02.log') SIZE 10240K,
GROUP 3 ('/usr/oracle/OraHome1/oradata/aultdb1/test/redo03.log') SIZE 10240K
USER SYS IDENTIFIED BY "password" USER SYSTEM IDENTIFIED BY "password";
Oracle10g sysaux
With the new SYSAUX tablespace, Oracle comes closer to providing all the needed tablespaces for a truly OFA-compliant database right out of the box. With just one CREATE DATABASE command we can specify the SYSTEM tablespace, the TEMPORARY tablespace, the AUXSYS tablespace, the default UNDO tablespace, and the redo logs.
Of course, with the Oracle Managed Files option you can create an entire database with a single command, but the database created is not suitable for production use and is not OFA-compliant.
The SYSAUX tablespace is required in all new 10g databases. Only the SYSAUX tablespace datafile location is specified. Oracle specifies the remainder of the tablespace properties including:
online
permanent
read write
extent managment local
segment space management auto
If a datafile is specified for the SYSTEM tablespace, then one must be specified for the SYSAUX tablespace as well. If one is not specified, then the CREATE DATABASE command will fail. The only exception is for an Oracle Managed File system.
During any update of a database to Oracle Database 10g, a SYSAUX tablespace must be created or the upgrade will fail. The SYSAUX tablespace has the same security profile as the SYSTEM tablespace. However, loss of the SYSAUX tablespace will not result in a database crash, only the functional loss of the schemas it contains.
Can I drop SysAux?
DROP DATAFILE
Read this...

SYSAUX tablespace grow too quick????

We have EBS R12.1 on LINUX system. Recently I found our development EBS database SYSAUX tablespace grow very quick. The SYSAUX tablespace has two data files and each data files size is 6GB (total 12 GB). In one month all 12 GB space are gone.
My questions are:
1. what objects or reports or ??? take this much space?
2. how to delete un-need space?
3. what is reasonable SYSAUX size?
Thanks.

I double check SYSAUX space usage and found it only use less than 100MB. Why SYSAUX show all 12 Gb space are gone?
SQL> l
1 SELECT occupant_name, schema_name, move_procedure,
2 space_usage_kbytes
3 FROM v$sysaux_occupants
4* ORDER BY 1
SQL> /
OCCUPANT_NAME SCHEMA_NAME MOVE_PROCEDURE SPACE_USAGE_KBYTES
AO SYS DBMS_AW.MOVE_AWMETA 45888
AUTO_TASK SYS 320
EM SYSMAN emd_maintenance.move_em_tblspc 0
EM_MONITORING_USER DBSNMP 0
EXPRESSION_FILTER EXFSYS 0
JOB_SCHEDULER SYS 1152
LOGMNR SYSTEM SYS.DBMS_LOGMNR_D.SET_TABLESPACE 13376
LOGSTDBY SYSTEM SYS.DBMS_LOGSTDBY.SET_TABLESPACE 1600
ORDIM ORDSYS 0
ORDIM/PLUGINS ORDPLUGINS 0
ORDIM/SQLMM SI_INFORMTN_SCHEMA 0
PL/SCOPE SYS 640
SDO MDSYS MDSYS.MOVE_SDO 0
SM/ADVISOR SYS 198528
SM/AWR SYS 1006144
SM/OPTSTAT SYS 10866560
SM/OTHER SYS 8192
SMON_SCN_TIME SYS 3328
SQL_MANAGEMENT_BASE SYS 1728
STATSPACK PERFSTAT 0
STREAMS SYS 1216
TEXT CTXSYS DRI_MOVE_CTXSYS 0
TSM TSMSYS 256
ULTRASEARCH WKSYS MOVE_WK 0
ULTRASEARCH_DEMO_USE WK_TEST MOVE_WK 0
R
WM WMSYS DBMS_WM.move_proc 0
XDB XDB XDB.DBMS_XDB.MOVEXDB_TABLESPACE 56192
XSAMD OLAPSYS DBMS_AMD.Move_OLAP_Catalog 0
XSOQHIST SYS DBMS_XSOQ.OlapiMoveProc 45888
29 rows selected.

SYSAUX tablespace full and snapshots not deleted

hi all,
I am on 10g linux.
1) my sysaux tablespace is full and i realize there are many awr snapshots lying around.
so i went to my OEM console -> Automatic Workload Repository and this are basically my settings
Snapshot Retention (days) 7
Snapshot Interval (minutes) 60
Collection Level TYPICAL
Next Snapshot Capture Time Sep 25, 2012 8:27:41 AM
However, when i check the amount of snapshots
->
Manage Snapshots and Preserved Snapshot Sets
Snapshots 247
Preserved Snapshot Sets 0
Latest Snapshot Time Sep 25, 2012 7:27:41 AM
Earliest Snapshot Time Jun 27, 2012 10:20:16 PM
q1) i have got 247 snapshots dated as early as Jun 27 but i am only retaining 7 days of snapshots ?
7 * 24 (1 hour snapshot frequency) != 247
there is no snapshot baseline also.
q2) why my latest snapshot time is dated way back to sept 25 ? is it because my sysaux is full for a longtime thus no more snapshot can be taken ? but i thought the retention of 7 days will remove obsolete snapshots ?
Please advise.
Regards,
Noob

Hi,
there are some problem in delete AWR stats.
For example, if the delete takes more 5 minute it's interrupted.
Look which component grows using awrinfo.sql under $ORACLE_HOME/rdbms/admin
You may execute the delete procedure manually than move and rebuild the tables.

Sysaux tablespace reached to 90%

Hi
I am getting alert message that sysaux tablespace reached to 90% I checked and found that total allocated space to sysaux is 500M.
1. Can I add datafile to increase size for sysaux tablespace?
2. What could be the reason for growth? Is there any way to free the space from sysaux table space?
Platform Solaris Database 10.2.0.4
Thank you in advance

SDD wrote:
Hi
I am getting alert message that sysaux tablespace reached to 90% I checked and found that total allocated space to sysaux is 500M.
1. Can I add datafile to increase size for sysaux tablespace?
2. What could be the reason for growth? Is there any way to free the space from sysaux table space?
Platform Solaris Database 10.2.0.4
Thank you in advanceselect occupant_name, space_usage_kbytes from v$sysaux_occupants;
use segment advisor to analyze the space occupied in sysaux tablesapace.
One thing you could do is to set AUTOEXTEND OFF in datafile(s) of SYSAUX tablespace, so you'll get an error, but you can understand where is the problem. Identify datafile(s) :
SQL> select file_name from dba_data_files
2 where tablespace_name = 'SYSAUX';
then for each file_name
SQL> alter database datafile
2 '<file_name>' autoextend off;
The sysaux tablespace is used to hold AWR data among other uses. Reduce the retention and interval setting for the AWR snapshots to reduce the space necessary to hold the data. See dbms_workload_repository package procedure modify_snapshot_settings.
Your statistics collection level will also feed into the above.
Take a look at other features/products you have assigned to sysaux if any and examine the data collection and retention rules you have specified for them.
Another major occupant of the SYSAUX tablespace is the embedded Enterprise Manager (EM) repository. This repository is used by Oracle Enterprise Manager Database Control to store its metadata. The size of this repository depends on database activity and on configuration-related information stored in the repository.
Other database components in the SYSAUX tablespace will grow in size only if their associated features (for example, Oracle UltraSearch, Oracle Text, Oracle Streams) are in use. If the features are not used, then these components do not have any significant effect on the size of the SYSAUX tablespace.
hope, this will helps you.
Edited by: rajeysh on Jun 17, 2010 4:20 PM

SYSAUX tablespace full

Hi,
What will happen if SYSAUX tablespace size is full and we do not increase the size?
Will the database hang or continue to run?
AFAIK if SYSTEM tablespace is full then database gets hanged.
Edited by: oratest on Feb 13, 2010 11:00 PM

If sysaux tblsp is full, the database would still remain operational except the functionality associated with AWR will not work. I would expect that the snapshots that by default gets gathered every hour cannot be stored anymore unless you increase the sysaux tablespace size.
Your database users would still be able to work normally though.

SYSAUX tablespace is getting filled up

Hi,
Friends, my PROD SYSAUX tablespace is getting filled up continously...is this normal behaviour..
i have allocated 3.7 GB for SYSAUX, now free is 9 MB...
I can allocate new space to SYSAUX...but Can I know, why it is getting filled up like this...
SQL> select username,default_tablespace,account_status from dba_users
2 where default_tablespace='SYSAUX';
=====================================================
USERNAME DEFAULT_TABLESPACE ACCOUNT_STATUS
DBSNMP SYSAUX OPEN
SYSMAN SYSAUX OPEN
WMSYS SYSAUX EXPIRED & LOCKED
ORDSYS SYSAUX EXPIRED & LOCKED
EXFSYS SYSAUX EXPIRED & LOCKED
XDB SYSAUX EXPIRED & LOCKED
DMSYS SYSAUX EXPIRED & LOCKED
OLAPSYS SYSAUX EXPIRED & LOCKED
SI_INFORMTN_SCHEMA SYSAUX EXPIRED & LOCKED
ORDPLUGINS SYSAUX EXPIRED & LOCKED
MDSYS SYSAUX EXPIRED & LOCKED
CTXSYS SYSAUX EXPIRED & LOCKED
ANONYMOUS SYSAUX EXPIRED & LOCKED
========================================================

Check the AWR (Automatic Workload Repository) settings as outlined in this metalink note:
Space Management In Sysaux Tablespace with AWR in use
Doc ID: Note:287679.1
Werner

Oracle XE system and sysaux tablespaces

I've got a question regarding system and sysaux tablespaces. Below are numbers from my Oracle XE database. Are these tablespaces constant or are they growing over time? I do not have any custom objects in either system or sysaux schema. If they extend is there a way to clean them up in order to reduce used space? Also, what is the impact of their size on the 4 GB XE limit?
# TABLESPACE NAME ALLOCATED (MB) USED (MB) FREE (MB) USED (%) FREE (%)
=====================================================================
1.SYSAUX....................710...............696.44........13.56..........98.09..........1.91
2.SYSTEM...................440...............429.75........10.25...........97.67......... 2.33
Thanks,
Art

Both should remain relatively constant.
The size of the SYSTEM tablespace will increase if you have many PL/SQL objects.
Whether they can be cleaned up can't be answered in a generic way, it depends.
They likely count to the 4 Gb limit.
Sybrand Bakker
Senior Oracle DBA

How Increase SYSAUX table space

Hi,
After running the script
REM
REM START OF SQL
REM
set pagesize 132
set linesize 80
column tspace_name format a21
column Pcent_Free format 99.9
column MB_Free format 999,999
column MB_Total format 999,999
select z.tablespace_name tspace_name,
(select sum(b.bytes)/(1024*1024) from dba_free_space b where b.tablespace_name = z.tablespace_name) MB_Free,
(select sum(a.bytes)/(1024*1024) from dba_data_files a where a.tablespace_name = z.tablespace_name) MB_Total,
((select sum(b.bytes)/(1024*1024) from dba_free_space b where b.tablespace_name = z.tablespace_name)/(select sum(a.bytes)/(1024*1024) from dba_data_files a where a.tablespace_name = z.tablespace_name)*100) Pcent_Free
from dba_tablespaces z
order by z.tablespace_name
REM
REM END OF SQL
REM
====================================================================
I got an O/P.
TSPACE_NAME MB_FREE MB_TOTAL PCENT_FREE
APPS_TS_ARCHIVE 367 866 42.4
APPS_TS_INTERFACE 253 1,041 24.3
APPS_TS_MEDIA 278 1,446 19.2
APPS_TS_NOLOGGING 26 64 40.0
APPS_TS_QUEUES 921 1,000 92.1
APPS_TS_SEED 455 3,038 15.0
APPS_TS_SUMMARY 253 1,146 22.1
APPS_TS_TOOLS 500 500 #####
APPS_TS_TX_DATA 778 5,992 13.0
APPS_TS_TX_IDX 1,170 8,462 13.8
APPS_UNDOTS1 1,235 1,730 71.4
CTXD 3 18 18.1
ODM 2 12 20.3
OLAP 17 17 99.6
OWAPUB 10 10 99.2
PORTAL 100 100 99.5
SYSAUX 1 446 .3
SYSTEM 1,895 12,681 14.9
TEMP1
TEMP2
20 rows selected.
Can any one will give me the complete procedure to increase the space in SYSAUX tablespace?
Regards,
Niranjan

Hi;
What is your DB version?
You can use toad etc program for increase your related tablespace or you can use below command
ALTER DATABASE DATAFILE '/xxx/sysaux01.dbf' RESIZE 2000M;
or you can give autoextend as follow:
ALTER DATABASE DATAFILE '/xxx/sysaux01.dbf' AUTOEXTEND ON NEXT 100M MAXSIZE 5000M;
Regard
Helios

Logical corruption found in the sysaux tablespace

Dear All:
We lately see the logical corruption error when running dbverify command which shows the block corruption. It is always on the the sysaux tablespace. The database is 11g and platform is Linux.
we get the error like:error backing up file 2 block xxxx: logical corruption and this comes to alert.log out of the automated maintenance job like sqltunning advisor running during maintenance window.
Now As far as I know,we can't drop or rename the sysaux tablespace. there is a startup migrate option to drop the SYSAUX but it does not work due to the presence of domain indexes. you may run the rman block media recovery but it ends with not fixing since rman backups are more of physical than maintain the logical integrity.
Any help, advise, suggestion will be highly appreciated.

If you let this corruption there then you are likely to face a big issue that will compromise database availability sooner or later. The sysaux is a critical tablespace, so you must proceed with caution.
Make sure you have a valid backup and don't do any thing unless you are sure about what you are doing and you have a fall back procedure.
if you still have a valid backup then you can use rman to perform a db block level recovery, this will help you in fixing the block. Otherwise try to restore and recover the sysaux. In case you cannot fix the block by refreshing the sysaux tablespace then I suggest you to create a new database and use aTransportable Tablespace technique to migrate all tablespaces from your current database to the new one and get rid of this database.
~ Madrid
http://hrivera99.blogspot.com

System and sysaux tablespace

hi,
can anyone tell me whata system and sysaux tablespace contains, and how to manage them.

The system tablespace
The system tablespace is always available when a database is open (it cannot be taken offline).
The system tablespace stores the data dictionary (or their base tables, respectively).
The sysaux tablespace
The sysaux tablespace is new with Oracle 10g. It is used to store database components that were stored in the system tablespace in prior releases of the database.
Also, the tablespaces that were needed for RMAN's recovery catalog, for Ultra Search, for Data Mining, for XDP and for OLAP are going to sysaux with 10g.
Additionally, it is the place where automatic workload repository stores its information.
The SYSAUX tablespace was installed as an auxiliary tablespace to the SYSTEM tablespace when you created your database. Some database components that formerly created and used separate tablespaces now occupy the SYSAUX tablespace.
If the SYSAUX tablespace becomes unavailable, core database functionality will remain operational. The database features that use the SYSAUX tablespace could fail, or function with limited capability.
refer the links:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/tspaces.htm#i1011659

Why increase sysaux tablespace

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