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2014年10月18日星期六

Certification Oracle de téléchargement gratuit pratique d'examen 1z0-067 1z0-062, questions et réponses

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Code d'Examen: 1z0-067
Nom d'Examen: Oracle (Upgrade Oracle9i/10g/11g OCA to Oracle Database 12c OCP)
Questions et réponses: 177 Q&As

Code d'Examen: 1z0-062
Nom d'Examen: Oracle (Oracle Database 12c: Installation and Administration)
Questions et réponses: 166 Q&As

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NO.1 Users report this error message when inserting rows into the orders table:
ERROR atline1:
ORA-01654f:unable to extend index USERS.ORDERS_IND by 8in tablespace INDEXES
You determine that the indexes tablespace is out of space and there is no free space on the
filesystem used by the Oracle database.
Which two must you do to fix this problem without affecting currently executing queries?
A. drop and re-create the index
B. coalesce the orders ind index
C. coalesce the indexes tablespace
D. perform an on line table rebuild using dbns_redefir.ition.
E. rebuild the index online moving it to another tablespace that has enough free space for the index
Answer: A,C

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NO.2 You issue the command:
SQL> ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
Which statement is true about the command?
A. It creates a copy of the control file and stores it in the location specifiedin the diagnostic_dest
initialization parameter.
B. It creates a file that contains the SQL statement, which is required to re-create the control file.
C. It updates the alert log file with the location and contents of the control file.
D. It creates a binary backup of the control file.
Answer: A

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NO.3 In which three scenarios is media recovery required?
A. when a tablespace is accidentally dropped from a database
B. when archived redo log files are lost
C. when data files are lost
D. when one of the online redo log members is corrupted
E. when all control files are lost
Answer: A,D,E

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Reference:http://docs.oracle.com/cd/A87860_01/doc/server.817/a76993/recoscen.htm

NO.4 Which parameter must be set to which value to implement automatic PGA memory
management?
A. Set memory_target to zero.
B. Set STATISTICS_LEVEL to BASIC.
C. Set pga_aggregate_target to a nonzero value.
D. Set pga_aggregate_target and sga_target to the same value.
E. Set sgajtarget to zero.
Answer: C

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Reference:http://docs.oracle.com/cd/B28359_01/server.111/b28310/memory004.htm#ADM
IN11233

NO.5 Your database is running in archivelog mode. Examine the parameters for your database
instance:
LOG_ARCHIVE_DEST_l ='LOCATION=/disk1/arch MANDATORY' LOG_ARCHIVE_DEST_2
='LOCATION=/disk2/arch' LOG_ARCHIVE_DEST_3 ='LOCATIO=/disk3/arch' LOG_ARCHIVE_DEST_4
='LOCATIONs/disk4/arch' LOG_ARCHIVE_MIN_SUCCEED_DEST=2
While the database is open, you notice that the destination set by the log_archive_dest_1 parameter
is not available. All redo log groups have been used.
What happens at the next log switch?
A. The database instance hangs and the redo log files are not overwritten.
B. The archived redo log files are written to the fast recovery area until the mandatory destination is
made available.
C. The database instance is shutdown immediately.
D. The destination set by the log_archive_destparameter is ignored and the archived redo log files
are created in the next two available locations to guarantee archive log success.
Answer: D

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NO.6 Which two statements are true about scheduling operations in a pluggable database (PDB)?
A. Scheduler jobs for a PDB can be defined only at the container database (CDB) level.
B. A job defined in a PDB runs only if that PDB is open.
C. Scheduler attribute setting is performed only at the CDB level.
D. Scheduler objects created by users can be exported or imported using Data Pump.
E. Scheduler jobs for a PDB can be created only by common users.
Answer: C,D

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NO.7 Which three statements are true regarding the use of the Database Migration Assistant for
Unicode (DMU)?
A. A DBA can check specific tables with the DMU
B. The database to be migrated must be opened read-only.
C. The release of the database to be converted can be any release since 9.2.0.8.
D. The DMUcan report columns that are too long in the converted characterset
E. The DMUcan report columns that are not represented in the converted characterset
Answer: A,D,E

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Explanation:
A: In certain situations, you may want to exclude selected columns or tables from scanning or
conversion steps of the migration process.
D: Exceed column limit
The cell data will not fit into a column after conversion.
E: Need conversion
The cell data needs to be converted, because its binary representation in the target
character set is different than the representation in the current character set, but neither
length limit issues nor invalid representation issues have been found.

NO.8 You notice that the performance of your production 24/7 Oracle 12c database has significantly
degraded. Sometimes you are not able to connect to the instance because it hangs. You do not want
to restart the database instance.
How can you detect the cause of the degraded performance?
A. Enable Memory Access Mode, which reads performance data from SGA.
B. Use emergency monitoring to fetch data directly from SGA for analysis.
C. Run Automatic Database Diagnostic Monitor (ADDM) to fetch information from the latest
Automatic Workload Repository (AWR) snapshots.
D. Use Active Session History (ASH) data and hang analysis in regular performance monitoring,
E. Run ADDM in diagnostic mode.
Answer: C

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Explanation:
* In most cases, ADDM output should be the first place that a DBA looks when notified of a
performance problem.
* Performance degradation of the database occurs when your database was performing optimally in
the past, such as 6 months ago, but has gradually degraded to a point where it becomes noticeable to
the users. The Automatic Workload Repository (AWR) Compare Periods report enables you to
compare database performance between two periods of time.
While an AWR report shows AWR data between two snapshots (or two points in time), the AWR
Compare Periods report shows the difference between two periods (or two AWR reports with a total
of four snapshots). Using the AWR Compare Periods report helps you to identify detailed
performance attributes and configuration settings that differ between two time periods.
Reference: Resolving Performance Degradation Over Time

2014年9月27日星期六

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Code d'Examen: 1z0-062
Nom d'Examen: Oracle (Oracle Database 12c: Installation and Administration)
Questions et réponses: 166 Q&As

Code d'Examen: 1z0-067
Nom d'Examen: Oracle (Upgrade Oracle9i/10g/11g OCA to Oracle Database 12c OCP)
Questions et réponses: 177 Q&As

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NO.1 Examine the resources consumed by a database instance whose current Resource Manager
plan is displayed.
SQL> SELECT name, active_sessions, queue_length, Consumed_cpu_time, cpu_waits,
cpu_wait_time FROM v$rsrc_consumer_group;
NAMEACTIVE_SESSIONS QUEUE_LENGTH CONSUMED_CPU_WAITS CPU_WAIT_TIME
OLTP__ORDER__ENTRY1029690 467 6709 OTHES__GROUPS 0 059823664089 60425 SYS_GROUP 1
02420704 914 19540 DS.S_QUERIES4245946603004 55700
Which two statements are true?
A. An attempt to start a new session by a user belonging to DSS_QUERIES fails with an error.
B. An attempt to start a new session by a user belonging to OTHE_GROUPS fails with an error.
C. The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited
for the CPU due to resource management.
D. The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited
for the CPU due to I/O waits and latch or enqueue contention.
E. A user belonging to the DSS__QUERIES resource consumer group can create a new session but
the session will be queued.
Answer: C,E

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NO.2 The ORCL database is configured to support shared server mode. You want to ensure that a
user connecting remotely to the database instance has a one-to-one ratio between client and server
processes.
Which connection method guarantees that this requirement is met?
A. connecting by using an external naming method
B. connecting by using the easy connect method
C. creating a service in the database by using the dbms_service.create_service procedure and using
this service for creating a local naming service"
D. connecting by using the local naming method with the server = dedicated parameter set in the
tnsnames.ora file for the net service
E. connecting by using a directory naming method
Answer: C,E

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NO.3 Which three factors influence the optimizer's choice of an execution plan?
A. the optimizer_mode initialization parameter
B. operating system (OS) statistics
C. cardinality estimates
D. object statistics in the data dictionary
E. fixed baselines
Answer: A,B

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Reference: http://docs.oracle.com/cd/B19306_01 /server.102 /b14211 /optimops.htm

NO.4 Which statement is true about the Log Writer process?
A. It writes when it receives a signal from the checkpoint process (CKPT).
B. It writes concurrently to all members of multiplexed redo log groups.
C. It writes after the Database Writer process writes dirty buffers to disk.
D. It writes when a user commits a transaction.
Answer: D

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Reference: http://docs.oracle.com/cd/B19306_01 /server.102 /b14220/process.htm (see log writer
process (LGWR))

NO.5 Which three statements are true about a job chain?
A. It can contain a nested chain of jobs.
B. It can be used to implement dependency-based scheduling.
C. It cannot invoke the same program or nested chain in multiple steps in the chain.
D. It cannot have more than one dependency.
E. It can be executed using event-based or time-based schedules.
Answer: A,B,E

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Reference:
http://docs.oracle.com/cd/B28359_01 /server.111 /b28310/scheduse009.htm#ADMIN12459
12. Which two tasks can be performed on an external table?
A. partitioning the table
B. creating an invisible index
C. updating the table by using an update statement
D. creating a public synonym
E. creating a view
Answer: C,D

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13. A user establishes a connection to a database instance by using an Oracle Net connection.
You want to ensure the following:
1.The user account must be locked after five unsuccessful login attempts.
2.Data read per session must be limited for the user. 3- The user cannot have more than three
simultaneous sessions.
4. The user must have a maximum of 10 minutes session idle time before being logged off
automatically.
How would you accomplish this?
A. by granting a secure application role to the user
B. by implementing Database Resource Manager
C. by using Oracle Label Security options
D. by assigning a profile to the user
Answer: D

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14. Which action takes place when a file checkpoint occurs?
A. The checkpoint position is advanced in the checkpoint queue.
B. All buffers for a checkpointed file that were modified before a specific SCN are written to disk by
DBWn and the SCN is stored in the control file.
C. The Database Writer process (DBWn) writes all dirty buffers in the buffer cache to data files.
D. The Log Writer process (LGWR) writes all redo entries in the log buffer to online redo log files.
Answer: C

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15. As a user of the ORCL database, you establish a database link to the remote HQ database
such that all users in the ORCL database may access tables only from the SCOTT schema in the HQ
database. SCOTT's password is TIGER. The service mane "HQ" is used to connect to the remote HQ
database.
Which command would you execute to create the database link?
A. CREATE DATABASE LINK HQ USING 'HQ';
B. CREATE DATABASE LINK HQ CONNECT TO CXJRRENT_USER USING HQ' S
C. CREATE PUBLIC DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';
D. CREATE DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';
Answer: B

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NO.6 You plan to create a database by using the Database Configuration Assistant (DBCA), with the
following specifications:
-Applications will connect to the database via a middle tier.
-The number of concurrent user connections will be high.
-The database will have mixed workload, with the execution of complex BI queries scheduled at
night.
Which DBCA option must you choose to create the database?
A. a General Purpose database template with default memory allocation
B. a Data Warehouse database template, with the dedicated server mode option and AMM enabled
C. a General Purpose database template, with the shared server mode option and Automatic
Memory Management (AMM) enabled
D. a default database configuration
Answer: C

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Reference:
http://www.oracledistilled.com/oracle-database/administration/creating-a-databaseusing-database
-configuration-assistant/

NO.7 Examine the parameters for your database instance:
NAMETYPE VALUE
undo_management string AUTO undo_retentioninteger 12 00 undo_tablespace string UNDOTBS1
You execute the following command:
SQL> ALTER TABLESPACE undotbs1 RETENTION NOGUARANTEE;
Which statement is true in this scenario?
A. Undo data is written to flashback logs after 1200 seconds.
B. Inactive undo data is retained for 1200 seconds even if subsequent transactions fail due to lack of
space in the undo tablespace.
C. You can perform a Flashback Database operation only within the duration of 1200 seconds.
D. An attempt is made to keep inactive undo for 1200 seconds but transactions may overwrite the
undo before that time has elapsed.
Answer: A

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NO.8 The hr user receiver, the following error while inserting data into the sales table: ERROR at line
1:
ORA-01653; unable to extend table HR.SALES by 128 in tablespace USERS
On investigation, you find that the users tablespace uses Automnrif Segment Space Management
(ASSM). It is the default tablespace for the HR user with an unlimited quota on it.
Which two methods would you use to resolve this error?
A. Altering the data life associated with the USERS tablespace to ex automatically
B. Adding a data life to the USERS tablespace
C. Changing segment space management for the USERS tablespace to manual
D. Creating a new tablespace with autoextend enabled and changing the default tablespace of the
HR user to the new tablespace
E. Enabling resumable space allocation by setting the RESUMABLE_TIMEOUT parameter to a
nonzero value
Answer: A,D

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