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Q31. 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:


Q32. Which three statements are true when the listener handles connection requests to an Oracle 12c database instance with multithreaded architecture enabled In UNIX? 

A. Thread creation must be routed through a dispatcher process 

B. The local listener may spawn a now process and have that new process create a thread 

C. Each Oracle process runs an SCMN thread. 

D. Each multithreaded Oracle process has an SCMN thread. 

E. The local listener may pass the request to an existing process which in turn will create a thread. 

Answer: A,D,E 


Q33. Examine the memory-related parameters set in the SPFILE of an Oracle database: 

memory_max_target—6G memory_target=5G pga_aggregate_target=500M sga_max_size=0 sga_target=0 

Which statement is true? 

A. Only SGA components are sized automatically-

B. Memory is dynamically re-allocated between the SGA and PGA as needed. 

C. The size of the PGA cannot grow automatically beyond 500 MB. 

D. The value of the MEMORY_TARGET parameter cannot be changed dynamically. 

Answer:


Q34. You use the segment advisor to help determine objects for which space may be reclaimed. 

Which three statements are true about the advisor given by the segment advisor? 

A. It may advise the use of online table redefinition for tables in dictionary managed tablespace. 

B. It may advise the use of segment shrink for tables in dictionary managed tablespaces it the no chained rows. 

C. It may advise the use of online table redefinition for tables in locally managed tablespaces 

D. It will detect and advise about chained rows. 

E. It may advise the use of segment shrink for free list managed tables. 

Answer: B,C,D 

Explanation: The Segment Advisor generates the following types of advice: 

* If the Segment Advisor determines that an object has a significant amount of free space, it recommends online segment shrink. If the object is a table that is not eligible for shrinking, as in the case of a table in a tablespace without automatic segment space management, the Segment Advisor recommends online table redefinition (C). 

* (D) If the Segment Advisor encounters a table with row chaining above a certain threshold, it records that fact that the table has an excess of chained rows. 


Q35. Which task would you recommend before using the Database Upgrade Assistant (DBUA) to upgrade a single-instance Oracle 11g R2 database to Oracle Database 12c? 

A. shutting down the database instance that is being upgraded 

B. executing the catctl.pl script to run the upgrade processes in parallel 

C. running the Pre-Upgrade Information Tool 

D. copying the listener.ora file to the new ORACLE_HOME 

Answer:

Reference: http://docs.oracle.com/cd/E11882_01/server.112/e23633/upgrade.htm#UPGRD12395 


Q36. Which three are direct benefits of the multiprocess, multithreaded architecture of Oracle Database 12c when it is enabled? 

A. Reduced logical I/O 

B. Reduced virtual memory utilization 

C. Improved parallel Execution performance 

D. Improved Serial Execution performance 

E. Reduced physical I/O 

F. Reduced CPU utilization 

Answer: B,C,F 

Explanation: * Multiprocess and Multithreaded Oracle Database Systems 

Multiprocess Oracle Database (also called multiuser Oracle Database) uses several processes to run different parts of the Oracle Database code and additional Oracle processes for the users—either one process for each connected user or one or more processes shared by multiple users. Most databases are multiuser because a primary advantage of a database is managing data needed by multiple users simultaneously. 

Each process in a database instance performs a specific job. By dividing the work of the database and applications into several processes, multiple users and applications can connect to an instance simultaneously while the system gives good performance. 

* In previous releases, Oracle processes did not run as threads on UNIX and Linux systems. Starting in Oracle Database 12c, the multithreaded Oracle Database model enables Oracle processes to execute as operating system threads in separate address spaces. 


Q37. Which three statements are true concerning unplugging a pluggable database (PDB)? 

A. The PDB must be open in read only mode. 

B. The PDB must be dosed. 

C. The unplugged PDB becomes a non-CDB. 

D. The unplugged PDB can be plugged into the same multitenant container database (CDB) 

E. The unplugged PDB can be plugged into another CDB. 

F. The PDB data files are automatically removed from disk. 

Answer: B,D,E 

Explanation: B, not A: The PDB must be closed before unplugging it. 

D: An unplugged PDB contains data dictionary tables, and some of the columns in these encode information in an endianness-sensitive way. There is no supported way to handle the conversion of such columns automatically. This means, quite simply, that an unplugged PDB cannot be moved across an endianness difference. 

E (not F): To exploit the new unplug/plug paradigm for patching the Oracle version most effectively, the source and destination CDBs should share a filesystem so that the PDB’s datafiles can remain in place. 

Reference: Oracle White Paper, Oracle Multitenant 


Q38. You administer an online transaction processing (OLTP) system whose database is stored in Automatic Storage Management (ASM) and whose disk group use normal redundancy. 

One of the ASM disks goes offline, and is then dropped because it was not brought online before DISK_REPAIR_TIME elapsed. 

When the disk is replaced and added back to the disk group, the ensuing rebalance operation is too slow. 

Which two recommendations should you make to speed up the rebalance operation if this type of failure happens again? 

A. Increase the value of the ASM_POWER_LIMIT parameter. 

B. Set the DISK_REPAIR_TIME disk attribute to a lower value. 

C. Specify the statement that adds the disk back to the disk group. 

D. Increase the number of ASMB processes. 

E. Increase the number of DBWR_IO_SLAVES in the ASM instance. 

Answer: A,D 

Explanation: A: ASM_POWER_LIMIT specifies the maximum power on an Automatic Storage Management instance for disk rebalancing. The higher the limit, the faster rebalancing will complete. Lower values will take longer, but consume fewer processing and I/O resources. 

D: 

* Normally a separate process is fired up to do that rebalance. This will take a certain amount of time. If you want it to happen faster, fire up more processes. You tell ASM it can add more processes by increasing the rebalance power. 

* ASMB 

ASM Background Process Communicates with the ASM instance, managing storage and providing statistics 

Incorrect: Not B: A higher, not a lower, value of DISK_REPAIR_TIME would be helpful here. Not E: If you implement database writer I/O slaves by setting the DBWR_IO_SLAVES parameter, you configure a single (master) DBWR process that has slave processes that are subservient to it. In addition, I/O slaves can be used to "simulate" asynchronous I/O on platforms that do not support asynchronous I/O or implement it inefficiently. Database I/O slaves provide non-blocking, asynchronous requests to simulate asynchronous I/O. 


Q39. 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 

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


Q40. You are administering a database and you receive a requirement to apply the following restrictions: 

1. A connection must be terminated after four unsuccessful login attempts by user. 

2. A user should not be able to create more than four simultaneous sessions. 

3. User session must be terminated after 15 minutes of inactivity. 

4. Users must be prompted to change their passwords every 15 days. 

How would you accomplish these requirements? 

A. by granting a secure application role to the users 

B. by creating and assigning a profile to the users and setting the REMOTE_OS_AUTHENT parameter to FALSE 

C. By creating and assigning a profile to the users and setting the SEC_MAX_FAILED_LOGIN_ATTEMPTS parameter to 4 

D. By Implementing Fine-Grained Auditing (FGA) and setting the REMOTE_LOGIN_PASSWORD_FILE parameter to NONE. 

E. By implementing the database resource Manager plan and setting the SEC_MAX_FAILED_LOGIN_ATTEMPTS parameters to 4. 

Answer:

Explanation: You can design your applications to automatically grant a role to the user who is trying to log in, provided the user meets criteria that you specify. To do so, you create a secure application role, which is a role that is associated with a PL/SQL procedure (or PL/SQL package that contains multiple procedures). The procedure validates the user: if the user fails the validation, then the user cannot log in. If the user passes the validation, then the procedure grants the user a role so that he or she can use the application. The user has this role only as long as he or she is logged in to the application. When the user logs out, the role is revoked. 

Incorrect: 

Not B: REMOTE_OS_AUTHENT specifies whether remote clients will be authenticated with the value of the OS_AUTHENT_PREFIX parameter. 

Not C, not E: SEC_MAX_FAILED_LOGIN_ATTEMPTS specifies the number of authentication attempts that can be made by a client on a connection to the server process. 

After the specified number of failure attempts, the connection will be automatically dropped by the server process. 

Not D: REMOTE_LOGIN_PASSWORDFILE specifies whether Oracle checks for a password file. 

Values: 

shared 

One or more databases can use the password file. The password file can contain SYS as well as non-SYS users. 

exclusive 

The password file can be used by only one database. The password file can contain SYS as well as non-SYS users. 

none 

Oracle ignores any password file. Therefore, privileged users must be authenticated by the operating system. 

Note: 

The REMOTE_OS_AUTHENT parameter is deprecated. It is retained for backward compatibility only.