OCP-1Z0-053-V12.02-669题

669.User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA,

which commands must you execute to enable SCOTT to flash back the transactions? (Choose four.)

A. ALTER DATABASE FLASHBACK ON;

B. GRANT SELECT any transaction TO scott;

C. GRANT EXECUTE ON dbms_flashback TO scott;

D. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;

E. ALTER TABLESPACE undots1 RETENTION GUARANTEE;

F. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;

Answer: BCDF 

 

答案解析：

参考：http://blog.csdn.net/rlhua/article/details/12224763

 

四个先决条件。