Why the Media recovery is necessary once a data file is brought back to fashion online?
Hi DBAs,
Consider the following scenario:
Offline data file:
08:09:38 coredev > select status, name from v$ datafile where name like '% UNDO4% ';
NAME OF THE STATE
------- ----------------------------------------------------------------------
F:\ORACLE\ORADATA\CD\UNDO4 ONLINE. DBF
08:09:47 coredev > alter database datafile ' F:\ORACLE\ORADATA\CD\UNDO4. DBF' offline;
Database altered.
08:09:58 coredev > select status, name from v$ datafile where name like '% UNDO4% ';
NAME OF THE STATE
------- ----------------------------------------------------------------------
RETRIEVE F:\ORACLE\ORADATA\CD\UNDO4. DBF
08:10:02 coredev > select * from v$ tablespace where name = "UNDO";
ENC FLA BIG TS # NAME INC.
---------- ------------------------------ --- --- --- ---
UNDO 33 YES NO YES
Data file online:
08:10:53 coredev > alter database datafile ' F:\ORACLE\ORADATA\CD\UNDO4. DBF' online;
ALTER database datafile ' F:\ORACLE\ORADATA\CD\UNDO4. DBF' online
*
ERROR on line 1:
ORA-01113: file 21 needs media recovery
ORA-01110: data file 21: ' F:\ORACLE\ORADATA\CD\UNDO4. DBF'
08:11:04 coredev > recover datafile ' F:\ORACLE\ORADATA\CD\UNDO4. DBF';
Complete media recovery.
08:11:13 coredev > alter database datafile ' F:\ORACLE\ORADATA\CD\UNDO4. DBF' online;
Database altered.
08:11:49 coredev > select status, name from v$ datafile where name like '% UNDO4% ';
NAME OF THE STATE
------- ----------------------------------------------------------------------
F:\ORACLE\ORADATA\CD\UNDO4 ONLINE. DBF
Now my doubt is:
1.Pourquoi Media recovery is necessary once a data file brought to online from offline mode?
2. why DB not open and throws the error message after brining online of offline?
3. Why is he asking for recovery of the media?
I'm very confused...!
Kind regards
Ritu
In order to make the UNDO4 data file. Coherent DBF with other UNDO tablespace data files, when you bring it from OFFLINE to ONLINE, the changes that happened during the period offline needs to be applied to this data file hence it is requires media recovery.
It is directed by my understanding.
Tags: Database
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