1Z0-053單項選擇題每日一練(2019.01.17)

During the installation of Oracle Database 11g，you do not set ORACLE_BASE explicitly. You selected the option to create a database as part of the installation. 
How would this environment variable setting affect the installation？（）  

In your database，the LDAP_DIRECTORY_SYSAUTH initialization parameter has been set to YES and the users who need to access the database as DBAs have been granted SYSDBA enterprise role in Oracle Internet Directory （OID）. SSL and the password file have been configured. A user SCOTT with the SYSDBA privilege tries to connect to the database instance from a remote machine using the command：$ SQLPLUS scott/tiger@DB01 AS SYSDBA  
where DB01 is the net service name.  
Which authentication method would be used first？（）  

You enable block change tracking. You issue the following command:
BACKUP INCREMENTAL LEVEL 0 DATABASE;
The next day, you issue the following command:
BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;
Which statement about the use of the change tracking file is true?（）