System Change Number Query Flashbacks : Flashbacks « Transaction « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Transaction » Flashbacks

35. 6. 5. System Change Number Query Flashbacks

Flashbacks based on system change numbers (SCNs) can be more precise than those based on a time, because the database uses SCNs to track changes.


SQL> VARIABLE current_scn NUMBER

SQL> EXECUTE :current_scn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();



PL/SQL procedure successfully completed.



SQL> PRINT current_scn



CURRENT_SCN

-----------

    5547739



SQL>

35. 6. Flashbacks
	35. 6. 1.	Query Flashbacks
	35. 6. 2.	Granting the Privilege for Using Flashbacks
	35. 6. 3.	Time Query Flashbacks
	35. 6. 4.	To disable a flashback, you execute DBMS_FLASHBACK.DISABLE()
	35. 6. 5.	System Change Number Query Flashbacks
	35. 6. 6.	DBMS_FLASHBACK.ENABLE_AT_SYSTEM_CHANGE_NUMBER() procedure enables you to perform a flashback to an SCN.

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