典型的局域网可以看成由以下三部分组成：网络服务器、工作站与A．IP地址B．通信设备C．TCP/IP协议D．网

Your multitenant container database (CDB) is running in ARCHIVELOG mode. You connect to the CDB RMAN.Examine the following command and its output:You execute the following command:RMAN > BACKUP DATABASE PLUS ARCHIVELOG;Which data files will be backed up？（）

A. Data files that belong to only the root container

B. Data files that belong to the root container and all the pluggable databases (PDBs)

C. Data files that belong to only the root container and PDB$SEED

D. Data files that belong to the root container and all the PDBs excluding PDB$SEED

ays. Presently the database is open and configured in ARCHIVELOG mode.The following steps must be performed in the correct sequence to do this:Choose the correct sequence.（）

A. 4, 1, 3, 2, 5

B. 4, 3, 1, 2, 5

C. 2, 4, 3, 5, 1

D. 4, 2, 5, 3, 1

er each.One of the redo log groups has become corrupted. You have issued the following command during the recovery of a damaged redo log file:ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3;Which action should you perform immediately after using this command？（）

A. You should perform a log switch

B. You should make a backup of the database

C. You should switch the database to the NONARCHIVELOG mode

D. You should shut down the database instance and perform a complete database recovery

A. only the control file, the current SPFILE, and data files

B. only the current SPFILE and data files if autobackup is disabled

C. only the data files and the archived redo logs

D. the control file, current SPFILE file, data files, and archived redo logs

s the following error message:Which is the recommended sequence of operations you need to perform for the query successfully？（）

A. Drop the affected tablespace, re-create the tablespace, restore the datafiles, and the tablespace.

B. Take the affected datafile offline (if not already offline), restore the damaged image of the datafile, and then bring it online.

C. Restart the database in MOUNT mode, restore the damaged datafile, recover the datafile and then open the database with resetlogs.

D. Put the database in RESTRICTED mode, restore all the datafiles in the affected datafile and recover the tablespace, and then put the database in normal operational mode.

(RMAN) with recovery catalog to perform the database backup at regular intervals. When you attempt to restart the database instance after a regular maintenance task on Sunday, the database fails to open displaying the message that the data file belonging to the users tablespace are corrupted.The steps to recover the damaged data files are follows:1. Mount the database2. Open the database3. Recover the data file4. Restore the data file5. Make the data file offline6. Make the data file onlineWhich option identifies the correct sequence that you must use to recover the data files？（）

A.2，4，3

B.1，4，3，2

C.2，5，4，3，6

D.5，2，4，3，6

E.1，5，4，3，6，2

ntains one redo member. When you attempt to start the database, you receive the following errors:Which statement should you use to resolve this issue？（）

A. ALTER DATABASE DROP LOGFILE GROUP 1;

B.ALTER DATABASE CLEAR LOGFILE GROUP 1;

C. ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1;

D. ALTER DATABASE DROP LOGFILE MEMBER ‘D:\REDO01.LOG‘;

A. The source database backup must be copied over the net for test database.

B. The source database must be run in ARCHIVELOG mode if the database is open.

C. The source database must be shut down cleanly if the database is in mounted state.

D. A net service name should be set up and a listener configured with the target as well as the source database.