单项选择题

Examine the following RMAN command:RMAN> CONFIGURE ENCRYPTION FOR DATABASE ON;RMAN> BACKUP DATABASE PLUS ARCHIVELOG;Which prerequisite must be met before accomplishing the backup?（）

A.Provide a password for the encryption
B.Set up an Oracle wallet for the encryption
C.No setup is required as it is a default encryption method
D.Both Oracle wallet and password must be set up for the encryption

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单项选择题

You are working in an online transaction processing (OLTP) environment. You use the FLASHBACKTABLE command to flash back the CUSTOMERS tablE.Before executing the FLASHBACK TABLE command, the system change number (SCN) was 663571. After flashing back the CUSTOMERS table, you realize that the table is not in the correct statE.Now, you need to reverse the effects of the FLASHBACK TABLE commanD.Which is the fastest and the most efficient option to reverse the effects of the FLASHBACK TABLE command?（）A.Restore the backup control file and open the database with RESETLOGS option.B.Perform point-in-time recovery because flashback cannot be performed again on this tableC.Execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571D.Execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571

单项选择题

现有：1.interfaceAltitude{2.／／insertcodehere3.}和4个声明：intHIGH=7；publicintHIGH=7；abstractintHIGH=7；interfaceintHIGH=7；分别插入到第2行，有多少行可以编译？（）

A.0
B.1
C.2
D.3
E.4

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