Hermanto,

    That depends on whether your using public or private rollback segments. 
Personally I prefer private just for this reason.  So, assuming your using
private rollback segments:

1) shutdown your DB.
2) comment our the ROLLBACK_SEGS parameter in INIT.ora
3) startup mount the DB
4) alter database datafile 'rbs02.dbf' offline drop;
5) alter database open;
6) drop tablespace rbs including contents;
7) create tablespace rbs datafile 'rbs01.dbf' size <>;
8) create rollback segment <>;
9) repeat step 8 as often as desired.
10) shutdown db
11) uncomment ROLLBACK_SEGS parameter in init.ora, edit the values as required.
12) restart DB
13) coffee time.

DickG.

____________________Reply Separator____________________
Author: Hermanto P <[EMAIL PROTECTED]>
Date:       8/14/2001 12:35 AM

Hi gurus,
Recently, I have forgotten to backup one of rollback segment file
(rbs02.dbf).
When I want to restore..the db can not startup normally.
Anyone can give me advise..
Thanks in advance.

Warm regards,
Hermanto
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