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тАО02-21-2001 05:38 PM
тАО02-21-2001 05:38 PM
Rollback segment corruption
How does one identify that Database is suffering from Rollback segment corruption, i know there is V$ROLLSTAT which can be viewed , other than are there any practical life situations when one is sure that it is rollback segment corruption
DBA Guys
3 REPLIES 3
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тАО02-22-2001 02:39 AM
тАО02-22-2001 02:39 AM
Re: Rollback segment corruption
You can use "dbv" to verify the datafile(s) of the rollback segment(s). "dbv" is in the directory ORACLE_HOME/bin.
Laszlo
Laszlo
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тАО03-01-2001 07:58 AM
тАО03-01-2001 07:58 AM
Re: Rollback segment corruption
ALOK,
Laszlo is correct in that you can use the utility db_verify to validate your datafiles.
However, I am pretty sure that Oracle would crash when accessing the corrupted block(s) of a corrupted rollback segment - as it would not be able to complete the current transaction. If nothing else, the transaction itself should roll back with an Oracle Error message and a message in the alert.log file.
I have never come across this before, so I am interested in the symptoms you are having. I have seen instances, and had to recover from instances, where a rollback segment has been lost and could not be recovered - and there are additional init.ora commands that you can use to start the database with a corrupt or missing rollback segment.
Laszlo is correct in that you can use the utility db_verify to validate your datafiles.
However, I am pretty sure that Oracle would crash when accessing the corrupted block(s) of a corrupted rollback segment - as it would not be able to complete the current transaction. If nothing else, the transaction itself should roll back with an Oracle Error message and a message in the alert.log file.
I have never come across this before, so I am interested in the symptoms you are having. I have seen instances, and had to recover from instances, where a rollback segment has been lost and could not be recovered - and there are additional init.ora commands that you can use to start the database with a corrupt or missing rollback segment.
If at first you do not succeed. Destroy all evidence that you even attempted.
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тАО03-01-2001 08:01 AM
тАО03-01-2001 08:01 AM
Re: Rollback segment corruption
oops please read dbv instead of db_verify in last message - brain has slipped off the rails.
If at first you do not succeed. Destroy all evidence that you even attempted.
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