Which three statements are true about Flashback Database?

Which three statements are true about Flashback Database?

Which three statements are true about Flashback Database?

A.
Flashback logs are written sequentially, and are archived.

B.
Flashback Database uses a restored control file to recover a database.

C.
The Oracle database automatically creates, deletes, and resides flashback logs in the Fast
Recovery Area.

D.
Flashback Database can recover a database to the state that it was in before a reset logs
operation.

E.
Flashback Database can recover a data file that was dropped during the span of time of the
flashback.

F.
Flashback logs are used to restore to the blocks’ before images, and then the redo data may be
used to roll forward to the desired flashback time.

Explanation:
* Flashback Database uses its own logging mechanism, creating flashback logs and
storing them in the fast recovery area (C). You can only use Flashback Database if flashback logs
are available. To take advantage of this feature, you must set up your database in advance to
create flashback logs.
* To enable Flashback Database, you configure a fast recovery area and set a flashback retention
target. This retention target specifies how far back you can rewind a database with Flashback
Database.
From that time onwards, at regular intervals, the database copies images of each altered block in

every data file into the flashback logs. These block images can later be reused to reconstruct the
data file contents for any moment at which logs were captured. (F)
Incorrect:
Not E: You cannot use Flashback Database alone to retrieve a dropped data file. If you flash back
a database to a time when a dropped data file existed in the database, only the data file entry is
added to the control file. You can only recover the dropped data file by using RMAN to fully restore
and recover the data file.
Reference: Oracle Database Backup and Recovery User’s Guide 12c R



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Shawn

Shawn

Right answer is C, D & F.

Shawn

Shawn

“You cannot use FLASHBACK DATABASE to return to a point in time before the restore or re-creation of a control file. If the database control file is restored from backup or re-created, then all existing flashback log information is discarded.”

“Specify TO BEFORE RESETLOGS to flash the database back to just before the last resetlogs operation (ALTER DATABASE OPEN RESETLOGS).”

Sylvain

Sylvain

C,D & F also

CNS

CNS

I cleared this exam last week.

This exam is very very specificity demanding paper. Some questions were really good majority are what are pre-reqs? arrange the steps in sequence and pure bookish.

The answer options are placed very close, they expect the candidate to know the stuff very specific as specific as NOT NULL & NAMED NOT NULL constraint.

Oleg

Oleg

From Oracle 12c Doc
..You cannot back up flashback logs to locations outside the fast recovery area.
..It cannot be used to repair media failures, or to recover from accidental deletion of data files.
..You cannot use FLASHBACK DATABASE to return to a point in time before the restore or re-creation of a control file.
..Flashback Database is similar to conventional point-in-time recovery in its effects.

https://docs.oracle.com/database/121/BRADV/flashdb.htm#BRADV582

So
CDF is correct