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2014年9月24日星期三

Le matériel de formation de l'examen de meilleur Oracle 1z0-485 1z0-062 1z1-485

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Code d'Examen: 1z0-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

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

Code d'Examen: 1z1-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

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NO.1 Which two statements are true about the logical storage structure of an Oracle database?
A. An extent contains data blocks that are always physically contiguous on disk.
B. An extent can span multiple segments,
C. Each data block always corresponds to one operating system block.
D. It is possible to have tablespaces of different block sizes.
E. A data block is the smallest unit of I/O in data files.
Answer: B,D

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Reference: http://docs.oracle.com/cd/E11882_01 /server.112 /e40540/logical.htm#CNCPT250

NO.2 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.3 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.4 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.5 Which two statements correctly describe the relationship between data files and logical
database structures?
A. A segment cannot span data files.
B. A data file can belong to only one tablespace.
C. An extent cannot span data files.
D. The size of an Oracle data block in a data file should be the same as the size of an OS block.
Answer: B,C

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Reference: https://mohibalvi.wordpress.com/tag/alter-tablespace/

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 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.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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2014年3月19日星期三

Les meilleures Oracle 1z0-485 examen pratique questions et réponses

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Code d'Examen: 1z0-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

1z0-485 Démo gratuit à télécharger: http://www.pass4test.fr/1z0-485.html

NO.1 A customer has three databases named CC. FIN, and DW. The CC database is for their
CallCenter. Even a slight decrease in the response time of the database would mean more people
"on hold" in their data center. The orders received through the CallCenter are stored in the Finance
(FIN) database. Both databases, CC and FIN, serve as sources for the Data Warehouse (DW)
database. All databases use the same Automatic Storage Management (ASM) diskgroup and
therefore, the same physical disks on Exadata storage. The customer wants to dynamically control
the resources that are available for the CallCenter database because this has direct impact on their
operations?
Which option should be implemented?
A. DBRM on the CC database
B. DBRM on all the databases
C. IORM, because DBRM cannot be changed for an existing session
D. IORM and DBRM
Answer: B

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Explanation:
Using the Database Resource Manager, you can: Distribute available processing resources by
allocating percentages of CPU time to different users and applications. In a data warehouse, a
higher percentage may be given to ROLAP (relational on-line analytical processing) applications than
to batch jobs.

NO.2 Which two statements are true about enabling write-back flash cache?
A. When enabling write-back flash cache in a non rolling manner, it is important to ensure that
asmdeactivatonoutcome is set to YES and asmModestatus is set to ONLINE for all grid disks.
B. Before using write-back flash cache, you need to verify the minimum required versions.
C. Before write back-flash cache is enabled, you need to drop the Flash Cache first.
D. The setting flashCacheMode should be set to writeback by updating cellinit.ora and restarting
cellsrv.
E. When enabling write-back flash cache in a rolling manner, dcli should be used to inactivate the
grid disks on all cells first.
Answer: B,C

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Explanation:
B: Exadata storage version 11.2.3.2.1 is the minimum version required to use this write back flash
cache option.
C: Steps for Enabling Write back flash cache:
First of all, you don't need the stop CRS or database (This is ROLLING method) ,you can do it cell
by cell.
*drop flashcache
*Be sure asmdeactivationoutcome is YES is before disabling grid disk

NO.3 Which is the best location to point your customer to, for finding the latest Exadata patches?
A. owner's guide
B. Patch database in MyOracle Support
C. MyOracle Support note 888828.1
D. MyOracle Support for database patches, ULN for OS patches, and Sun Support for Server and
InfiniBand patches.
Answer: B

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Explanation:
Before starting, we would like to share and note here two documents from My Oracle Support, aka
metalink. These notes must be the first place that you need to go to review before patching the
Exadata environment.
* (B) Database Machine and Exadata Storage Server 11g Release 2 (11.2) Supported Versions (Doc ID.
888828.1)
-This is for the second and third generation (V2 and X2) for Oracle Exadata, using Sun hardware.
* Database Machine and Exadata Storage Server 11g Release 1 (11.1) Supported Versions (Doc
ID. 835032.1)
* - This is for the first generation (V1) for Oracle Exadata, using HP hardware.

NO.4 Consider this CellCLI command:
CellCLI> CREATE GRIDDISK ALL HARDDISK PREFIX=data, size=423G;
Which two statements describe what happens when you execute this command?
A. It creates one 423 GB grid disk on the first available cell hard disk.
B. It creates one 423 GB grid disk on each available cell hard disk.
C. It creates grid disks on the outermost 423 GB that is available on each hard disk.
D. It creates grid disks on the innermost 423 GB that is available on each hard disk.
E. It creates an Exadata Smart Flash Cache on all flash drives.
Answer: B,C

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Explanation:
* Example: CellCLI> create griddisk all harddisk prefix=temp_dg, size=570G This command will
create 12 Griddisks, each of 570G in size from the outer (fastest) sectors of the underlying Harddisks.
It fills up the first 2 Celldisks entirely, because they have just 570G space free - the rest is already
consumed by the OS partition.
8. You get a Host Unreachable error when you attempt to connect to a server through a network
terminal command line. What are two other ways in which you can connect?
A. Use the ILOM Web GUI.
B. Use the dcli command at the root prompt on a database node.
C. Attach a terminal device to the back panel of the server with a serial cable.
D. Connect by using SQL *Plus.
E. Log in as root on the database node using the Net1 IP address.
Answer: A,C

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Explanation:
In addition to gaining shell access via SSH to manage your Exadata servers, you can also access them
from the Integrated Lights Out Management (ILOM) console or KVM console.
and should typically not require modifications unless you have changed network information inside
your database machine.
Note: A KVM switch (with KVM being an abbreviation for "keyboard, video and mouse") is a
hardware device that allows a user to control multiple computers from one or more[1] keyboard,
video monitor and mouse. Although multiple computers are connected to the KVM, typically a
smaller number of computers can be controlled at any given time
9. Identify three best practices for applying asmdeactivationoutcome es on Exadata Database
Servers and Exadata Storage Servers?
A. Backing up database servers and storage cells is not recommended before performing planned
maintenance.
B. Database server updates can be rolled back using the the "yum downgrade" procedure.
C. Bundle patches do not require testing before being installed on a production system.
D. It is recommended that Exadata systems with Data Guard configured use the "Standby First"
patching approach.
E. Patching should never be interrupted due to a connection drop. It is therefore recommended that
you use VNC or the screen utility.
F. Before patching cells in a rolling manner, you must check asmdeactivationoutcome amModestatus
and make sure that cells on all disks are online and that disks can be deactivated.
Answer: D,E,F

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10. The mpstat output from OS Watcher shows a database node as being 90% idle on an average.
What would you do to get a full picture of CPU utilization on the entire Exadata RAC cluster?
A. Average the mpstat id1 output from all the nodes.
B. Ask application users if they have noticed a slowdown in screen response.
C. Look for an increase in batch job servicing times.
D. A & B above
Answer: A

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NO.5 Consider the following setup:
User A1 belongs to resource group High on Database A.
User B2 belongs to resource group Low on Database B.
User C3 is a user on Database C without any DBRM setup.
DBRM setup:
Database A: Resource group High gets 80% and Low gets 20%.
Database B: Resource group High gets 60% and Low gets 40%.
IORM setup:
Database A: Share=20, limit=5
Database B: Share=30, limit=10
Database C: 5 shares
Total number of shares in the IORM setup = 100
What percent of I/O will each database user theoretically be using when the Exadata storage unit
I/O throughout is used 100% and no other databases but A, B, and C are running?
A. Al = 36%, B2=18%, and C3=9%
B. Al = 33%, B2=33%, and C3=33%
C. AI = 10%, B2=5%, and C3=20%
D. Al = 8%, B2=12%, and C3=5%
E. Al = 5%, B2=10%, and C3=85%
Answer: E

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Explanation:
IORM setup limits Database A to 5%, and Database B is limited to 10%, while
Database C has not IORM limit.
Not that the resource groups are for CPU allocation.

NO.6 Consider the following software changes that are performed manually on a Linux server:
1.Changes for Linux kernel firewall configuration
2.Changes for custom performance monitoring tools
3.Changes for security scan tools
4.Changes for Linux system performance optimization
Which of the software changes listed are permitted on Exadata Storage Servers?
A. 1, 2, 3, and 4
B. only 3 '
C. none
D. only 2
E. only 1 and 2
F. only 2 and 3
Answer: E

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Explanation:
1. The Storage Server Patch is responsible for keeping our cell nodes always up-todate, fixing
possible problems, and this patch includes different component patches, like kernel patches,
firmware, operation system, etc... for the Storage Server. Incorrect: 3,4: security scan tools changes
and Linux system performance optimization changes would be on the database server.

NO.7 Exadata Database Machine offers an Intelligent Platform Management Interface for the
various components in the Exadata product. Which option is true?
A. IPMI can be used to remotely start and stop servers.
B. IPMI can be used to remotely log in to the operating system.
C. IPMI commands can be executed by using SNMP traps.
D. IPMI settings can be secured by backing up the Oracle Linux installation on the storage system.
Answer: A

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Explanation:
IPMI - short for Intelligent Platform Management Interface - is an interface standard that allows
remote management of a server from another using standardized interface. The servers in the
Exadata Database Machine follow that. It's not an Exadata command but rather a general Linux one.
To power on a cell or database server, issue this from another server: # ipmitool -H prolcel01-ilom
-U root chassis power on
To stop a server, use the shutdown command. To stop immediately and keep it down, i.e. not reboot,
execute:# shutdown -h -y now

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