quick question about System Change Number(SCN) in FlashBack Query topic


Posted on 16th Feb 2014 07:03 pm by admin

i know tht we can get the SCN of the database using flashback concept as follows

SQL> execute :myvariable:=dbms_flashback.get_system_change_number();

PL/SQL procedure successfully completed.

SQL> print myvariable;

MYVARIABLE
451578

for example i made some insertions into a table after this and commit is executed. If i want to rollback this transaction thn i can use

SQL> execute dbms_flashback.enable_at_system_change_number(:myvariable);

PL/SQL procedure successfully completed.

but what if i dont know the SCN of the database before the transaction(insertion in to the table). If i want to rollback the database to state where i don't know the SCN of that particular state, thn how can i do tht.

i know tht we can do it using timestamp method....but i want to know how we can use this SCN concept in this situation.
Thanks

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