Dernières Oracle 1Z0-023 1Z0-054 1Z0-026 1Z0-025 1Z0-024 1Z0-108 examen pratique questions et réponses

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Code d'Examen: 1Z0-023
Nom d'Examen: Oracle (Architecture and Administration)
Questions et réponses: 151 Q&As

Code d'Examen: 1Z0-054
Nom d'Examen: Oracle (Oracle Database 11g: Performance Tuning)
Questions et réponses: 192 Q&As

Code d'Examen: 1Z0-026
Nom d'Examen: Oracle (Network Administration)
Questions et réponses: 128 Q&As

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

Code d'Examen: 1Z0-024
Nom d'Examen: Oracle (Performance Tuning)
Questions et réponses: 92 Q&As

Code d'Examen: 1Z0-108
Nom d'Examen: Oracle (Oracle WebLogic System Administration)
Questions et réponses: 141 Q&As

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NO.1 Which three statements about rebuilding indexes are true? (Choose three)
A. The ALTER INDEX REBUILD command is used to change the storage characteristics of an
index.
B. Using the ALTER INDEX REBUILD is usually faster than dropping and recreating an index
because it uses the fast full scan feature.
C. Oracle8i allows for the creation of an index or re-creation of an existing index while allowing
concurrent operations on the base table.
D. When building an index, the NOLOGGING and UNRECOVERABLE keywords can be used
concurrently to reduce the time it takes to rebuild.
Answer: A, B, C

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NO.2 What are two main OLTP requirements? (Choose two)
A. Use bind variables rather than literals in your SQL code.
B. Analyze your tables regularly to refresh optimizer statistics.
C. Create multiple small rollback segments as opposed to a few big ones.
D. Create indexes on all columns that are regularly used in query predicates.
E. Set up appropriate default storage parameter values for dynamic (implicit) space allocation.
Answer: B, C,

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NO.3 What is the least number of buffers an LRU latch must cover in the database buffer cache?
A. 5
B. 10
C. 30
D. 50
E. 100
Answer: D

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NO.4 When a deadlock shutdown is detected by Oracle, where is the trace file generated?
A. SQL_TRACE
B. TRACE_DEST
C. USER_DUMP_DEST
D. CORE_DUMP_DEST
E. BACKGROUND_DUMP_DEST
Answer: C

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NO.5 Which dynamic view is most useful for determining the current number of blocks allocated
to a buffer pool?
A. V$CACHE
B. V$SESS_IO
C. V$SYSSTAT
D. V$BUFFER_POOL
Answer: D

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NO.6 If a willing-to-wait latch request is satisfied on the first attempt, which statistic gets
incremented?
A. GETS
B. SLEEPS
C. MISSES
D. IMMEDIATE_GETS
E. IMMEDIATE_ MISSES
F. IMMEDIATE_GETS
Answer: A

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NO.7 Which two statements about plan stability and stored outlines are true? (Choose two)
A. You can group outlines in categories.
B. You can only have one stored outline per SQL statement.
C. Plan stability works only when SQL statements match.
D. Stored outlines are saved in the data dictionary (SYS schema)
E. Stored outlines become invalid when you analyze the associated objects.
Answer: A, C

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NO.8 What will this statement do?
CREATE TABLESPACE temp
DATAFILE 'C:\database\temp.dbf' SIZE 10n
Temporary;
A. Create a tablespace that will be dropped on instance shutdown.
B. Create a tablespace in which the user can create segments for usage during sorts.
C. Create a tablespace in which oracle can create segments for usage during sorts.
D. Create a tablespace in which a user can create tables that will be automatically dropped after a
week
Answer: C

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NO.9 For which reason would you query V$SYSSTAT?
A. Name of the sort segment.
B. Free space available for a sort segment.
C. Number of disk sorts performed since startup.
D. Number of users active on individual sort segments.
Answer: C

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NO.10 Which two views can be sued to detect lock contention? (Choose two)
A. V$LOCK
B. V$LOCKED_OBJECT
C. V$LOCK_CONTENTION
Answer: A, B

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NO.11 What does this statement do?
SQL>ANALYZE INDEX index_name VALIDITY STRUCTURE;
A. It places information into the INDEX_STATS view and allows for the monitoring of space
used by an index.
B. It provides information in the INDEX_HISTOGRAM view to indicate whether an index is
invalid or valid.
C. It provides information in the DBA_INDEXES view for the COST BASED Optimizer when
choosing an execution plan.
Answer: A

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NO.12 Which tablespace is used as the temporary tablespace if 'TEMPORARY TABLESPACE' is
not specified for a user?
A. TEMP
B. DATA
C. SYSTEM
D. ROLL-BACK
Answer: C

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NO.13 When performing a sort operation, you notice that there are a large number of sorts
requiring I/O to the disk. Which parameter could be increased to allow more sorts to be
performed in memory?
A. SORT_AREA_SIZE
B. LARGE_POOL_SIZE
C. SORT_AREA_RETAINED_SIZE
D. SORT_MULTIBLOCK_READ_COUNT
Answer: A

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NO.14 Which type of transaction should you assign to a specific large rollback segment?
A. Batch jobs that modify many rows.
B. Long running serializable transactions.
C. Long running reports, to avoid 'snapshot too old' errors.
D. Discrete transactions that modify many rows in the same block.
Answer: A

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NO.15 The database includes tables with static data, which are used for queries only. To which
size should you set PCTFREE for this type of table?
A. 0
B. 50
C. 20
D. 10
Answer: A

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NO.16 Which three types of statistics are reported in report.txt after running UTLESTAT SQL?
(Choose three)
A. Locking statistics.
B. Memory usage statistics.
C. Explain plan statistics.
D. Library cache statistics.
E. Buffer busy wait statistics.
F. Rollback contention statistics.
Answer: D, E, F

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NO.17 In which two ways can you reduce the amount of sorting that is performed? (Choose two)
A. By using UNIONinstead of UNION ALL.
B. By using NOSORT when creating tables.
C. By using NOSORT when creating indexes.
D. By using COMPUTE instead of ESTIMATE when analysing objects.
E. By reducing the number of users that have the sort privilege.
F. By creating appropriate indexes on tables that are joined often.
Answer: C, F

Oracle   1Z0-024   1Z0-024

NO.18 Which statement could require a sort?
A. SELECT DISTINCT dept_ID FROM emp;
B. UPDATE emp SET salary=salary*1.1 WHERE id 7722;
C. SELECT emp_id, nameFROM emp WHERE emp-id = 7722;
D. SELECT emp_id, nameFROM emp WHERE emp-id = BETWEEN 7722 and 7100 ;
Answer: A

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NO.19 Which three statements about improving the performance of the database buffer cache by
creating multiple buffer pools are true? (Choose three)
A. One, two, or three pools may be defined.
B. There are at least 50 blocks per LRU latch for
each pool.
C. Each buffer pool is assigned latches taken from DB_BLOCK_LRU_LATCHES.
D. The size of the DEFAULT pool is obtained by adding all the pools to the value of the
DB_BLOCK_BUFFERS parameter.
Answer: A, B, C

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NO.20 Which action could potentially cause checkpoints to take longer?
A. Increasing the number of redo log groups.
B. Increasing the size of rollback segments.
C. Decreasing the value of the REDO_LOG_BUFFERS parameter.
D. Increasing the value of the FATS_START_IO_TARGET parameter.
Answer: D

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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 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.2 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.3 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.4 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.5 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.6 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.7 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.8 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.9 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.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

Oracle   certification 1Z0-025   1Z0-025   1Z0-025

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 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.13 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.14 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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NO.15 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

Oracle   1Z0-025   1Z0-025   1Z0-025 examen   1Z0-025

NO.16 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.17 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.18 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.19 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

Oracle   1Z0-025   1Z0-025

NO.20 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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