How to prohibit this restoration?

Hi, all the experts:
How to prohibit this restoration? the hidden or using events parameter?


Thanks in advance.

>
Roll forward is the application of commited transactions recorded in the journals of restoration by progression, for the data files before a crash.
>
Isn't that partially correct - before rolling process also applies "uncommitted" transactions from the logs of recovery. These "committed," operations are then 'cancelled' during 'restore '.

See the section 'Crash and recovery proceedings' in the doc of database Concepts
http://docs.Oracle.com/CD/B28359_01/server.111/b28318/startup.htm#sthref1431
>
Crash recovery and instance involves two distinct operations: roll forward of the current data files online using the operations committed and uncommitted contained in online redo records and then back change in transactions not posted to their original state.
>
The reason that uncommitted transactions must also be applied is explained in this section.
>
Two potential problems can occur if an instance failure occurs:

Blocks of data modified by a transaction could not be written in time the validation data files and may only appear in the redo log. Therefore, the redo log contains changes must be redone to the database during recovery.

After the roll before the phase, data files could contain changes that had not committed at the time of the failure. These uncommitted changes must be cancelled in order to ensure the consistency of the transactions. These changes were either recorded in the files of data before the failure, is introduced in the phase before rolling.
>
The foregoing explains how data files can contain uncommitted changes.
>
To resolve this dilemma, two distinct steps are typically used by the Oracle database for a successful recovery from a failure of the system: roll forward with the redo log (recovery of cache) and roll back with lower prices or cancel segments (recovery of the transaction).
>
'Cancel' the unsaved changes in files of data Oracle to use rollback/undo segments. The problem is that when you get the information you need not necessarily be in these segments. But this information IS in the REDO logs.

So part of this "roll forward" phase works also on segments rollback/cancellation to the same point in time as the data files... Then the phase of "restore" can "undo" transactions not posted from data files using that info restored by the restore/undo segments that present the advanced phase of roll.

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