| restoring from dbf [message #514055] |
Fri, 01 July 2011 02:11  |
kk-ksfe
Messages: 5
Registered: February 2009
Location: India
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Junior Member |
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Hi,
I have a 10G Express system running. I Have 2 tablespaces in production.
WHen taking backup, it terminates unsuccessfully saying system01.dbf is damaged.
The application works fine and no data loss is found through the application interface.
So can I shift the data to a new server using the dbf files of the tablespaces in use?
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| Re: restoring from dbf [message #514170 is a reply to message #514058] |
Sat, 02 July 2011 01:18  |
kk-ksfe
Messages: 5
Registered: February 2009
Location: India
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Junior Member |
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No cold backups available.
No Archive log.
But the application works fine.
What should be the approach that I should take to transfer the data to a new server?
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| Re: restoring from dbf [message #514257 is a reply to message #514203] |
Sun, 03 July 2011 03:03 |
Yasir Hashmi
Messages: 304
Registered: April 2006
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Senior Member |
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Even if you find the corruption, you won't be able to recover it as you have no backup and the tablespace in question is a system tablespace.
Even if your application is working fine, it might come to a halt.
If you want a corruption free database, take export of the database, drop the database ,create a new database,create additional tablespaces and users,import backup the data and immedialtely take a valid RMAN backup.
Schedule backups to ensure complete recoverabilty.
This seems to be the only option at the momemt.
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| Re: restoring from dbf [message #514258 is a reply to message #514257] |
Sun, 03 July 2011 03:20 |
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Michel Cadot
Messages: 68757
Registered: March 2007
Location: Saint-Maur, France, https...
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Senior Member
Account Moderator |
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Quote:Even if you find the corruption, you won't be able to recover it as you have no backup and the tablespace in question is a system tablespace.
It depends where the corruption happened. Sometimes you can, sometimes you can't.
Quote:If you want a corruption free database, take export of the database, drop the database ,create a new database,create additional tablespaces and users,import backup the data and immedialtely take a valid RMAN backup.
First check where the corruption happened, i might be useless to do all of this.
Regards
Michel
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| Re: restoring from dbf [message #514260 is a reply to message #514259] |
Sun, 03 July 2011 04:34 |
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Michel Cadot
Messages: 68757
Registered: March 2007
Location: Saint-Maur, France, https...
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Senior Member
Account Moderator |
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Quote:When the corruption is in the system tablespace, what else can we check?
Which object, if any, is impacted by the corruption.
Quote:Is there any way to recover system tablespace corruption without any backup?
Theorically, if you have all archived logs since the CREATE DATABASE it might be possible, maybe in a complex way, but I never checked, if I have some time I will test it.
But I repeat, when you have a corruption, the first to do is to check what is impacted by the corruption, maybe nothing.
Regards
Michel
[Updated on: Sun, 03 July 2011 04:34] Report message to a moderator |
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| Re: restoring from dbf [message #514747 is a reply to message #514745] |
Wed, 06 July 2011 04:28 |
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Michel Cadot
Messages: 68757
Registered: March 2007
Location: Saint-Maur, France, https...
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Senior Member
Account Moderator |
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Michel Cadot wrote on Sat, 02 July 2011 17:54Find where is the corruption, which object it impacts (if it impacts any).
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[quote title=Michel Cadot wrote on Sun, 03 July 2011 10:20]Quote:...
First check where the corruption happened, i might be useless to do all of this.
Regards
Michel
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