Recover datafile problem

Question

Hi, I am using Oracle 7.3.4 on NT 4.
I am having problem with one of my rollback segments call HISTORY which contain two datafiles in e:\rollback\history.ora and f:\rollback\history.ora
This rollback segment was used for transfer old data to HISTORY datafile in
f:\HISTORY\HISTORY.ora
(the sql look like this -
set transaction use rollback segment history;
insert into history.bk_tableA
where ..... )
Recently the HISTORY rollback was droped by mistake. Since then I lost access to history tables( in HISTORY datafile). When I open the storage manager
it shows these 3 files are in recover status.
What is the relationship between the History rollback seqment and History datafile?
The list below were the errors I got when trying to recover a datafile
First attemp:
SVRMGR>
recover datafile 'f:\history\history.ora';
ORA-00279: Change 525082216 generated at 12/08/99 16:24:02 needed for thread 1
ORA-00289: Suggestion : d:\ORANT\RDBMS73\%ORACLE_SID%25290.001
ORA-00280: Change 525082216 for thread 1 is in sequence #252904
Specify log: {=suggested | filename | AUTO | CANCEL}
ORA-00310: archived log contains sequence 252909; sequence 252904 required
ORA-00334: archived log: 'D:\ORANT\RDBMS73\ORCL25290.001'
I try auto, and even the suggested log file orcl25290.001 and still could not recover the datafile. It seems the recover program
cannot find the specific sequence # in the log file! Any suggestion?
Second attemp:
I try the incomplete, change base recovery -
SVRMGR>recover until chang 525082215
it shows Media recovery complete. Then, I open the database with
'alter database open noresetlogs'
But I still cannot access to that data file.
svrmgr>select count(*) from history.bk_sn_err;
count(*)
ora-00376: file 5 cannot be read at this time
ora-01110: data file 5: 'f:\history\history.ora'
From the storage manager the file is still in recover status.
Does the file been recovered at all?
Is it possible that I could drop the damaged
rollback segment and recreate a new one.
Should I be able to gain access to the f:\history\HISTORY.ora datafile?
[email protected]
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Answer 1

Hi Micheal,
when you said you had dropped the history, did you drop the rollback segment or did you delete the history.ora file from the NT or did you drop the file from Oracle by doing an
alter database adatfile '...history...'offline drop?
also is your database running in archivelog mode?
depending on the above, you will have to use different methods to recover.
from the error messages you seem to be running with no archivelog mode so you have to offline drop the datafile.
If you do an offline drop on the datafile, then you will have to drop tha tablespace and recreate it.
Thanks,
Mandar
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