From the Documentation
Hemant K Chitale, December 18, 2015 - 4:11 am UTC
The guidance did not work
saeed Amoudi, December 20, 2015 - 5:19 am UTC
we could not run the flash back command we get the below error
SQL> FLASHBACK DATABASE TO SCN 168585386;
FLASHBACK DATABASE TO SCN 168585386
*
ERROR at line 1:
ORA-38726: Flashback database logging is not on.
December 21, 2015 - 12:54 am UTC
Since you flashed back the primary database, I had assumed you had enabled flashback on the standby (and when I say enabled, I mean that it was enabled on the standby *at the time* of the flashback on the primary).
If you've only enabled it 'now', then it isnt going to help.
In this case, you'll need to restore an older backup (before scn 168585386) and start from there (or recreate the standby)
The guidance did not work
saeed Amoudi, December 20, 2015 - 10:00 am UTC
the solution does not work further more we have configure the flash back on both primary and standby but with no help.