Oracle 10g corruption type 'unknown'

I don't see unknown listed in the oracle docs as a corruption type.
10.2.0.3
DB in archivelog mode with weekly full backups
We only keep 1 backup. No tape backups (no space. no budget for tape. Its a development environment. )
All DBs are run from vmware. Not sure that matters
OS: Solaris.
checked both: v$database_block_corruption and v$backup_corruption
What is corruption_type = 'UNKNOWN' its not in the docs? All of my corrupt blocks in both views say 'unknown'
This is not production. Its development. So loss of data is not a big issue. Just trying to understand the situation.
It has been a number of years since I have had to repair block corruption. Please let me know if I am interpreting my findings correctly.
v$backup_corruption: I have corruption in my backups
v$database_block_corruption: corruption in my current DB
I only have 1 backup. (no space. No budget for tape backups... this is not production. working off of VMs. not exactly high end hardware).
Here are some additional questions:
1. Tried running a blockrecover. Did not expect it to work since the backups appear to be corrupted too. However, I did expect RMAN to tell me that I can't fix the blocks. dd thing is I didnt get any errors. I didn't expect the blocks to be repaired since the backups are corrupted. However, I did expect some kind of message or exception. How come oracle didn't say 'hey we can't repair this'
surprised that oracle is not telling me, I can't repair these? They dont get repaired almost certainly because the backup has corruption. Did I do something wrong or is this expected? After running this I checked v$database_block_corruption and nothing changed.
[code]
RMAN> blockrecover datafile 15 block 19621,19624,19608,19611,19617,19613;
Starting blockrecover at 07-AUG-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=288 devtype=DISK
starting media recovery
media recovery complete, elapsed time: 00:00:00
Finished blockrecover at 07-AUG-13
[/code]
2. I think my only other option is to use dbms_repair to flag these blocks as ignore. I know the segments involved and I can afford to ignore blocks in them. Its not the data dictionary. Is there something else I should look at?
3. If we change the rman backup command to backup validate, will this prevent the backups from running if there is corruption and generate an error? I can write a job that can look for it and send me an email.
4. would dbverify provide me with different data than what I got from rman?
Anything I am missing from my approach?

How did you determine that you've corruption in your database and in your database backups ? Any ORA- errors or messages?
What is the output of the views ?
2. I think my only other option is to use dbms_repair to flag these blocks as ignore. I know the segments involved and I can afford to ignore blocks in them. Its not the data dictionary. Is there something else I should look at?
did you try to create the corrupted segments using CTAS ?
Backup validate will only validate, by default RMAN should fail if it encounters corruption (unless specified otherwise). And I think, RMAN/dbv will provide the same output.

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u can email me in
[email protected]

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Message was edited by:
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