UNDOTBS1 and SYSAUX Tablespace Filename Mismatch in Oracle 11g XE

Question

Hi,
We have installed Oracle 11g XE 32 bit on Windows and found that Tablespace name and filenames are mismatched for UNDOTBS1, SYSAUX.
If you run following query:
SELECT TABLESPACE_NAME, FILE_NAME FROM DBA_DATA_FILES; You will get below output:
TABLESPACE_NAME                    FILE_NAME
============================================================================
USERS                C:\ORACLE\ORACLE11GXE\APP\ORACLE\ORADATA\XE\USERS.DBF
UNDOTBS1           C:\ORACLE\ORACLE11GXE\APP\ORACLE\ORADATA\XE\SYSAUX.DBF
SYSAUX                C:\ORACLE\ORACLE11GXE\APP\ORACLE\ORADATA\XE\UNDOTBS1.DBF
SYSTEM                C:\ORACLE\ORACLE11GXE\APP\ORACLE\ORADATA\XE\SYSTEM.DBFNotice the difference between UNDOTBS1 and SYSAUX.
UNDOTBS1 tablespace has filename SYSAUX.DBF while
SYSAUX tablespace has filename UNDOTBS1.DBF
Is this a bug or just a wrong name mapping?
Will this affects the internal behavior of tablespace as well for undo tablespace and APEX Installation?
Regards,
Sohil Bhavsar.

Answer 1

Error: ORA-03297 ... related to this mismatch of UNDOTBS1 with SYSAUXActually its related to trying to resize a file smaller than the existing extents in use, so yes, restores aren't the only place that could cause confusion from the "incorrect" datafile names.
Fixing it could be done in one pass if you don't mind adjusting filenames so they don't clash, i.e. shut down your database instance and move the files at the OS, startup mount and rename the files in the database.
Don't use the services applet, the instance has to be shutdown with sqlplus, leave the database service running. If you try to open the database with OS files renamed but not corrected in the instance, the database won't open if there are troubles with the undo datafile.
sqlplus /nolog
conn /as sysdba;
  ... connected ...
col name format a60
col tsname format a10
set lines 120
select t.name tsname,  d.name, d.BYTES / 1024 / 1024 mb from v$tablespace t, v$datafile d where t.ts#  = d.ts#;
system .../system.dbf  <n>
shutdown immediate;
... database closed ...
exit
cd <datafile directory> 
move sysaux.dbf undotbs01.dbf
move UNDOTBS1.DBF sysaux.dbf
# or use file explore GUI after shutdown
sqlplus /nolog
conn /as sysdba;
  ... connected to idle instance ...
startup mount;
  ... SGA, instance size info ...
alter database rename file 'C:\...<full path>\SYSAUX.DBF' to 'C:\...<full path>\UNDOTBS01.DBF';
alter database rename file 'C:\...<full path>\UNDOTBS1.DBF' to 'C:\...<full path>\SYSAUX.DBF';
select t.name tsname,  d.name, d.BYTES / 1024 / 1024 mb from v$tablespace t, v$datafile d where t.ts#  = d.ts#;
... make sure you get what was asked for ...
TSNAME     NAME                                                       MB
SYSTEM     C:\ORACLEXE\APP\ORACLE\ORADATA\XE\SYSTEM.DBF              360
SYSAUX     C:\ORACLEXE\APP\ORACLE\ORADATA\XE\SYSAUX.DBF              660
UNDOTBS1   C:\ORACLEXE\APP\ORACLE\ORADATA\XE\UNDOTBS01.DBF            25
USERS      C:\ORACLEXE\APP\ORACLE\ORADATA\XE\USERS.DBF               100
alter database open;
  ... database altered ...