How to rename datafiles?

Hi folks,
I have created datafiles thru Oracle 9i Admin wizard as DATA01.ORA Here, point to be noted is the data file extension (.ORA) which was shown as the default extension when I created the file. But after creating this, I have seen the existing data files with extensions as USERS.DBF, SYSTEM.DBF and so on.
What could be the impact if we have data files with .ORA extension? How do I rename this extension to .DBF without loosing the data on it?
Thank you,
MMS

There is no impact to having files named .ora vs .dbf
It is a matter of convention more than anything.
If you really want to rename all the datafiles the easiest approach is probably
sqlplus /nolog
connect sys/change_on_install as sysdba;
alter database backup controlfile to trace;
shutdown immediate;
(If on NT stop the OracleService'SID' for your DB)
Find the 'udump' directory and find the most recent ORA000????.trc file.
This contains a script which will recreate the controlfile via sql.
Now, with the DB shutdown rename all datafiles listed in the ORA000??? file to .dbf or .whatever
(Dont forget the TEMPFILE entries at the end.
Edit the ORA000????.trc file to reflect the new datafile names.
Delete everything before 'STARTUP' in that script.
Save in a directory as cr_NEWDB.sql
start service (if NT)
sqlplus /nolog
connect sys/change_on_install as sysdba
@cr_NEWDB.sql
If everything went well all files will be renamed.
This is also heavily documented in
http://otn.oracle.com/docs/products/oracle9i/doc_library/release2/server.920/a96521/dfiles.htm

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Hi
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alter tablespace usersdata rename datafile '/home/oracle/DB11G/usersdata03.dbf' to '/home/oracle/DB11G/usersdata04.dbf'
ERROR at line 1:
ORA-01525: error in renaming data files
ORA-01141: error renaming data file 8 - new file
'/home/oracle/DB11G/usersdata04.dbf' not found
ORA-01110: data file 8: '/home/oracle/DB11G/usersdata03.dbf'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Y ITS NOT HAPPENING ???????
Thnaks in adv..

##how to move datafiles.
1. Shut down the database E.G: shutdown immediate
2. Move datafiles by OS commands. mv /oracle/product/dbs/test02.dbf /oracle/oradata/ORALOG/test02.dbf
3. Startup the database in mount state e.g: startup mount
4. Rename that file e.g: alter database rename file '/oracle/product/dbs/test02.dbf' to '/oracle/oradata/ORALOG/test02.dbf';
5. Open the database e.g: alter database open
http://www.oracle-base.com/articles/misc/RenamingOrMovingOracleFiles.php
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Hello Gurus,
Due to some reason I need to rename my database.Can anybody tell me how to rename a database.
Secondly,What should be the criteria to fix the size of archive log.i.e.What should we keep in mind while deciding the size of archive log?
Thanx

For the first question:
http://www.google.co.uk/search?hl=en&q=oracle+rename+database&btnG=Google+Search&meta=
With regards to the archive logs, these are needed to recover your backed up datafiles. So, what you keep is largely determined by your backup strategy. Check out:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14220/backrec.htm#sthref2338

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ERROR at line 1:
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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.

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