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December 26, 2006

Detecting Unrecoverable Operations

Filed under: Oracle How To — H.Tonguç Yılmaz @ 2:38 pm

In the view V$DATAFILE, there are two columns that are updated when an unrecoverable operation is run in the database and modified the specific datafile.

The columns are:
* UNRECOVERABLE_CHANGE# – Change number at point unrecoverable change completes.
* UNRECOVERABLE_TIME – Timestamp at point unrecoverable change completes.

Monitoring these columns is useful if you are running physical standby database in your environment and can give you a heads up on any files that may need to be copied from the primary database.

This is also useful, since a number of bugs in Oracle partitioning cause indexes to be rebuilt in nologging mode, even when the system is supposed to be logging.

Code Listing 5 : Detecting Unrecoverable Operations

Testing Information : the scripts mentioned are tested on Oracle Database 10g Express Edition Release 10.2.0.1.0

References Used : Oracle® Database Reference 10g Release 2 (10.2)
Oracle® Data Guard Concepts and Administration 10g Release 2 (10.2)

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