2013年12月23日星期一

L'avènement de la certification Oracle pratique d'examen 1Z0-025 questions et réponses

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Code d'Examen: 1Z0-025
Nom d'Examen: Oracle (Backup and Recovery)
Questions et réponses: 127 Q&As

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NO.1 The alert log can contain specific information about which database backup activity?
A. Placing datafiles in begin and end backup mode.
B. Placing tablespace in begin and end backup mode.
C. Changing the database backup mode from open to close.
D. Performing an operating system backup of the database files.
Answer: B

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NO.2 What is the difference between using NOLOGGING operations in a single database
environment and a standby database environment?
A. There is no difference.
B. NOLOGGING operations are not available in release 0.1
C. The affected data file needs to be copied from the primary to the standby server.
D. NOLOGGING operations can be used on the standby database, but not on the primary
database.
Answer: C

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NO.3 What is the function of SMON in instance recovery?
A. It writes data to the archive log files.
B. It writes data to the online redo log files.
C. It frees resources held by user processes.
D. It synchronizes data file header and control files.
E. It roles forward by applying changes in the redo log.
F. It writes dirty buffers from the buffer cache to the data files.
Answer: E

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NO.4 What is the effect of activating a standby database?
A. The primary database becomes a standby database.
B. The standby database becomes the primary database.
C. The primary database is deactivated to avoid conflicts.
D. The remaining redo-log files are copied from the primary database and applied.
Answer: B

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NO.5 What is the function of ARCn in instance recovery?
A. It writes data to the archive log files.
B. It writes data to the online redo log files.
C. It frees resources held by user processes.
D. It synchronizes data file header and control files.
E. It writes dirty buffers from the buffer cache to the data files.
F. The archive process does not take part in instance recovery.
Answer: F

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NO.6 The command ALTER DATABASE CREATE STANDBY CONTROLFILE AS
standby.ct creates a standby control file. What needs to be done next to create a
standby database?
A. The standby control file needs to be copied to the standby server.
B. The current redo-log files of the primary database need to be archived.
C. The standby database needs to be created using the standby control file.
D. The standby control file needs to be copied to the standby location on the primary
server.
Answer: B

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NO.7 What is the correct procedure for multiplexing existing online redo logs?
A. Issue the ALTER DATABASE. . . ADD LOGFILE GROUP command.
B. Issue the ALTER DATABASE. . . ADD LOGFILE MEMBER command.
C. Shut down the database, copy the online redo-log, and start up the database.
D. Shut down the database, copy the online redo-log, edit the REDO_LOG_FILES
parameter, and start up the database.
Answer: B

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NO.8 What is the effect of issuing an ALTER DATABASE OPEN RESETLOGS
command on the primary database?
A. It invalidates the standby database.
B. The standby database can only be used in read-only mode.
C. A new standby database incarnation will automatically be started.
D. Once the archived log files are applied to the standby database, the redo log of the
standby database is reset.
Answer: A

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NO.9 Your daily report indicating which data files need to be backed up has been
misplaced. Which recovery manager command returns a report containing the files
in the USER_DATA tablespace that have not been backed up within the last three
days?
A. Rman> list backup day 3 tablespace user_data;
B. Rman>report backup day 3 tablespace user_data;
C.Rman>catalog backup day 3 tablespace user_data;
D. Rman>report need backup day 3 tablespace user_data;
Answer: D

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NO.10 What are two benefits of using RMAN with a catalog? (Choose two)
A. You can copy the redo-log history into the control file.
B. You can store scripts for backup and recovery operations.
C. You can register the target database with recovery catalog.
D. You can maintain records of backup and recovery operations.
E. You can synchronize the recovery catalog and the target database.
Answer: B, D

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NO.11 What are two purposes for using the recovery manager command CATALOG?
(Choose two)
A. Updating recovery catalog about rollback segment creation.
B. Updating recovery catalog about files created before RMAN.
C. Updating recovery catalog about operating systems backup.
D. Updating recovery catalog about files created before Oracle 8.
E. Updating recovery catalog about files that belong to a clone database.
Answer: B, C

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NO.12 Which option is used in the parameter file to detect corruptions in an Oracle data
block?
A. DBVERIFY
B. DBMS_REPAIR
C. DB_BLOCK_CHECKING
D. VALIDITY_STRUCTURE
Answer: C

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NO.13 Which command is used to allow RMAN to store a group of
commands in the recovery catalog?
A. ADD SCRIPT
B. CREATE SCRIPT
C. CREATE COMMAND
D. ADD BACKUP SCRIPT
Answer: B

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NO.14 What is the advantage of managed recovery mode?
A. During recovery, most common DBA errors can be avoided.
B. Prompts for applying the next available redo logs suppressed.
C. The primary database automatically ships archived redo log files to the standby server.
D. The standby database automatically applies the archived redo log when the files
become available.
Answer: D

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NO.15 After rebuilding the recovery catalog by resynchronizing it with a copy of the backup
control file, you notice references to files that no longer exist. Which CREATE command
clause should you use to remove these references?
A. REMOVE
B. DELETE
C. UNCATALOG
D. CATALOG REMOVE
Answer: C

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NO.16 Which statement is true when using the LogMiner utility?
A. The dictionary file is created in a directory as defined by UTL_FILE_DIR.
B. The CREATE DBMS LOGMSR command is used to build the dictionary file.
C. The dictionary file must be created after the log file analysis has completed.
D. The dictionary file is created as a backup if the data dictionary gets corrupted.
Answer: A

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NO.17 What are two causes of user errors? (Choose two)
A. Incorrect data is committed.
B. The operating system crashes.
C. There are insufficient privileges.
D. A table is accidentally truncated.
E. An application file is accidentally deleted.
F. The application program receives an addressing exception.
Answer: A, D

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NO.18 What is recommended initial size for a tablespace containing an RMAN recovery
catalog?
A. 10M
B. 20M
C. 100M
D. 10% of size of the target database.
Answer: A

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NO.19 Which statement concerning archiving is true?
A. Archiving occurs during a checkpoint.
B. Archive logs can be written to multiple destinations.
C. Backups are not required when archiving is enabled.
D. Archiving copies the data files to their backup destinations.
E. Archiving can be enabled through recovery manager commands.
Answer: B

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NO.20 Which statement is true when using the DBVERIFYutility to detect corruptions in
an Oracle data block?
A. The utility can only be invoked on a data file that is online.
B. The utility can be used to verify the data files of a backup database.
C. The utility can assist in archiving log files when the database load is high.
D. The utility is internal to the database and so can impact database activates.
Answer: B

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