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Exam Upgrade Oracle9i/10g/11g OCA OR OCP to Oracle Database 12c OCP
Number 1z0-067
File Name Oracle.1z0-067.PassGuide.2019-03-19.144q.vcex
Size 746 KB
Posted Mar 19, 2019
Download Oracle.1z0-067.PassGuide.2019-03-19.144q.vcex

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Demo Questions

Question 1

Which two statements are true about scheduling operations in a pluggable database (PDB)?


  1. Scheduler jobs for a PDB can be defined only at the container database (CDB) level.
  2. A job defined in a PDB runs only if that PDB is open.
  3. Scheduler attribute setting is performed only at the CDB level.
  4. Scheduler objects created by users can be exported or imported using Data Pump.
  5. Scheduler jobs for a PDB can be created only by common users.
Correct answer: BD
Explanation:
In general, all scheduler objects created by the user can be exported/imported into the PDB using data pump. Predefined scheduler objects will not get exported and that means that any changes made to these objects by the user will have to be made once again after the database has been imported into the pluggable database. However, this is how import/export works currently. A job defined in a PDB will run only if a PDB is open.
In general, all scheduler objects created by the user can be exported/imported into the PDB using data pump. Predefined scheduler objects will not get exported and that means that any changes made to these objects by the user will have to be made once again after the database has been imported into the pluggable database. However, this is how import/export works currently. A job defined in a PDB will run only if a PDB is open.



Question 2

A complete database backup to media is taken for your database every day. Which three actions would you take to improve backup performance?


  1. Set the backup_tape_io_slaves parameter to true.
  2. Set the dbwr_io_slaves parameter to a nonzero value if synchronous I/O is in use.
  3. Configure large pool if not already done.
  4. Remove the rate parameter, if specified, in the allocate channel command.
  5. Always use RMAN compression for tape backups rather than the compression provided by media manager.
  6. Always use synchronous I/O for the database.
Correct answer: BCD
Explanation:
Tuning RMAN Backup Performance: Procedure Many factors can affect backup performance. Often, finding the solution to a slow backup is a process of trial and error. To get the best performance for a backup, follow the suggested steps in this section: Step 1: Remove RATE Parameters from Configured and Allocated Channels Step 2: If You Use Synchronous Disk I/O, Set DBWR_IO_SLAVES Step 3: If You Fail to Allocate Shared Memory, Set LARGE_POOL_SIZE Step 4: Tune RMAN Tape Streaming Performance Bottlenecks Step 5: Query V$ Views to Identify Bottlenecks Reference:https://docs.oracle.com/database/121/BRADV/rcmtunin.htm#BRADV172
Tuning RMAN Backup Performance: Procedure Many factors can affect backup performance. Often, finding the solution to a slow backup is a process of trial and error. To get the best performance for a backup, follow the suggested steps in this section: Step 1: Remove RATE Parameters from Configured and Allocated Channels Step 2: If You Use Synchronous Disk I/O, Set DBWR_IO_SLAVES Step 3: If You Fail to Allocate Shared Memory, Set LARGE_POOL_SIZE Step 4: Tune RMAN Tape Streaming Performance Bottlenecks Step 5: Query V$ Views to Identify Bottlenecks 
Reference:https://docs.oracle.com/database/121/BRADV/rcmtunin.htm#BRADV172



Question 3

For which three pieces of information can you use the RMAN list command?


  1. stored scripts in the recovery catalog
  2. available archived redo log files
  3. backup sets and image copies that are obsolete
  4. backups of tablespaces
  5. backups that are marked obsolete according to the current retention policy
Correct answer: ABD
Explanation:
About the LIST Command: The primary purpose of the LIST command is to list backup and copies. For example, you can list: -Backups and proxy copies of a database, tablespace, datafile, archived redo log, or control file -Backups that have expired -Backups restricted by time, path name, device type, tag, or recoverability -Archived redo log files and disk copies Reference:http://docs.oracle.com/cd/B28359_01/backup.111/b28270/rcmreprt.htm#BRADV89585
About the LIST Command: The primary purpose of the LIST command is to list backup and copies. For example, you can list: -Backups and proxy copies of a database, tablespace, datafile, archived redo log, or control file -Backups that have expired -Backups restricted by time, path name, device type, tag, or recoverability -Archived redo log files and disk copies 
Reference:http://docs.oracle.com/cd/B28359_01/backup.111/b28270/rcmreprt.htm#BRADV89585



Question 4

You notice performance degradation in your production Oracle 12c database. You want to know what caused this performance difference. 
Which method or feature should you use?


  1. Database Replay
  2. Automatic Database Diagnostic Monitor (ADDM) Compare Period report
  3. Active Session History (ASH) report
  4. SQL Performance Analyzer
Correct answer: B
Explanation:
References: http://docs.oracle.com/cd/E24628_01/server.121/e17635/tdppt_degrade.htm
References: http://docs.oracle.com/cd/E24628_01/server.121/e17635/tdppt_degrade.htm



Question 5

Which three statements are true about a job chain?


  1. It can contain a nested chain of jobs.
  2. It can be used to implement dependency-based scheduling.
  3. It cannot invoke the same program or nested chain in multiple steps in the chain.
  4. It cannot have more than one dependency.
  5. It can be executed using event-based or time-based schedules.
Correct answer: ABE
Explanation:
Chains are the means by which you can implement dependency based scheduling, in which jobs are started depending on the outcomes of one or more previous jobs. DBMS_SCHEDULER.DEFINE_CHAIN_STEP DBMS_SCHEDULER.DEFINE_CHAIN_EVENT_STEP  Reference: http://docs.oracle.com/cd/B28359_01/server.111/b28310/scheduse009.htm#ADMIN12
Chains are the means by which you can implement dependency based scheduling, in which jobs are started depending on the outcomes of one or more previous jobs. DBMS_SCHEDULER.DEFINE_CHAIN_STEP DBMS_SCHEDULER.DEFINE_CHAIN_EVENT_STEP  
Reference: http://docs.oracle.com/cd/B28359_01/server.111/b28310/scheduse009.htm#ADMIN12



Question 6

Examine the command:
SQL> RECOVER DATABASE USING BACKUP CONTROLFILE UNTIL CANCEL; 
In which two scenarios is this command required?


  1. The current online redo log file is missing.
  2. A data file belonging to a noncritical tablespace is missing.
  3. All the control files are missing.
  4. The database backup is older than the control file backup.
  5. All the data files are missing.
Correct answer: AC
Explanation:
Reference:http://searchoracle.techtarget.com/answer/Recover-database-using-backup-controlfile-until-cancel
Reference:
http://searchoracle.techtarget.com/answer/Recover-database-using-backup-controlfile-until-cancel



Question 7

Which two are prerequisites for setting up Flashback Data Archive?


  1. Fast Recovery Area should be defined.
  2. Undo retention guarantee should be enabled.
  3. Supplemental logging should be enabled.
  4. Automatic Undo Management should be enabled.
  5. All users using Flashback Data Archive should have unlimited quota on the Flashback Data Archive tablespace.
  6. The tablespace in which the Flashback Data Archive is created should have Automatic Segment Space Management (ASSM) enabled.
Correct answer: DF
Explanation:
There are a number of restrictions for flashback archives: The tablespaces used for a flashback archive must use local extent management and automatic segment space management. The database must use automatic undo management.Reference:http://www.dba-oracle.com/t_11g_new_enabling_fdba.htm
There are a number of restrictions for flashback archives: The tablespaces used for a flashback archive must use local extent management and automatic segment space management. The database must use automatic undo management.
Reference:
http://www.dba-oracle.com/t_11g_new_enabling_fdba.htm



Question 8

You wish to create jobs to satisfy these requirements:
  1. Automatically bulk load data from a flat file. 
  2. Rebuild indexes on the SALES table after completion of the bulk load. 
How would you create these jobs?


  1. Create both jobs by using Scheduler raised events.
  2. Create both jobs using application raised events.
  3. Create one job to rebuild indexes using application raised events and another job to perform bulk load using Scheduler raised events.
  4. Create one job to rebuild indexes using Scheduler raised events and another job to perform bulk load by using events raised by the application.
Correct answer: C
Explanation:
The bulk loader would be started in response to a file watcher scheduler event and the indexes would be rebuilt in response to an application event raised by the bulk loader.  Your application can raise an event to notify the Scheduler to start a job. A job started in this way is referred to as an event-based job. The job can optionally retrieve the message content of the event.  References:https://docs.oracle.com/cd/B28359_01/server.111/b28310/scheduse008.htm#CHDIAJEBhttps://docs.oracle.com/cd/E18283_01/server.112/e17120/scheduse005.htm#CIABIEJA
The bulk loader would be started in response to a file watcher scheduler event and the indexes would be rebuilt in response to an application event raised by the bulk loader.  
Your application can raise an event to notify the Scheduler to start a job. A job started in this way is referred to as an event-based job. The job can optionally retrieve the message content of the event.  
References:
https://docs.oracle.com/cd/B28359_01/server.111/b28310/scheduse008.htm#CHDIAJEB
https://docs.oracle.com/cd/E18283_01/server.112/e17120/scheduse005.htm#CIABIEJA



Question 9

Examine the RMAN command:
RMAN> CONFIGURE ENCRYPTION FOR DATABASE ON; 
RMAN> BACKUP DATABASE PLUS ARCHIVELOG; 
Which prerequisite must be met before accomplishing the backup?


  1. The password for the encryption must be set up.
  2. Oracle wallet for the encryption must be set up.
  3. All the tablespaces in the database must be encrypted.
  4. Oracle Database Vault must be enabled.
Correct answer: B
Explanation:
Configuration encryption will used by Transparent encryption. For transparent encryption, you will need to create a wallet, and it must be open. Transparent encryption will then occur automatically after you have issued the CONFIGURE ENCRYPTION FOR DATABASE ON or CONFIGURE ENCRYPTION FOR TABLESPACE ON command.  CONFIGURE ENCRYPTION : You can use this command to persistently configure transparent encryption. You cannot persistently configure dual mode or password mode encryption. SET ENCRYPTION : You can use this command to configure dual mode or password mode encryption at the RMAN session level.Reference:http://docs.oracle.com/cd/E25054_01/backup.1111/e10642/rcmbckad.htm#CEGEJABH
Configuration encryption will used by Transparent encryption. For transparent encryption, you will need to create a wallet, and it must be open. Transparent encryption will then occur automatically after you have issued the CONFIGURE ENCRYPTION FOR DATABASE ON or CONFIGURE ENCRYPTION FOR TABLESPACE ON command.  
CONFIGURE ENCRYPTION : You can use this command to persistently configure transparent encryption. You cannot persistently configure dual mode or password mode encryption. SET ENCRYPTION : You can use this command to configure dual mode or password mode encryption at the RMAN session level.
Reference:http://docs.oracle.com/cd/E25054_01/backup.1111/e10642/rcmbckad.htm#CEGEJABH



Question 10

A database is running in archive log mode. The database contains locally managed tablespaces. Examine the RMAN command:
RMAN> BACKUP 
AS COMPRESSED BACKUPSET 
SECTION SIZE 1024M 
DATABASE; 
Which statement is true about the execution of the command?


  1. The backup succeeds only if all the tablespaces are locally managed.
  2. The backup succeeds only if the RMAN default device for backup is set to disk.
  3. The backup fails because you cannot specify section size for a compressed backup.
  4. The backup succeeds and only the used blocks are backed up with a maximum backup piece size of 1024 MB.
Correct answer: D
Explanation:
COMPRESSED enables binary compression. RMAN compresses the data written into the backup set to reduce the overall size of the backup set. All backups that create backup sets can create compressed backup sets. Restoring compressed backup sets is no different from restoring uncompressed backup sets. RMAN applies a binary compression algorithm as it writes data to backup sets. This compression is similar to the compression provided by many media manager vendors. When backing up to a locally attached tape device, compression provided by the media management vendor is usually preferable to the binary compression provided by BACKUP AS COMPRESSED BACKUPSET. Therefore, use uncompressed backup sets and turn on the compression provided by the media management vendor when backing up to locally attached tape devices. You should not use RMAN binary compression andmedia manager compression together. Some CPU overhead is associated with compressing backup sets. If the target database is running at or near its maximum load, then you may find the overhead unacceptable. In most other circumstances, compressing backup sets saves enough disk space to be worth the CPU overhead. SECTION SIZE sizeSpec  Specifies the size of each backup section produced during a data file backup. By setting this parameter, RMAN can create a multisection backup. In a multisection backup, RMAN creates a backup piece that contains one file section, which is a contiguous range of blocks in a file. All sections of a multisection backup are the same size. You can create a multisection backup for a data file, but not a data file copy. File sections enable RMAN to create multiple steps for the backup of a single large data file. RMAN channels can process each step independently and in parallel, with each channel producing one section of a multisection backup set. If you specify a section size that is larger than the size of the file, then RMAN does not use multisection backup for the file. If you specify a small section size that would produce more than 256 sections, then RMAN increases the section size to a value that results in exactly 256 sections. Depending on where you specify this parameter in the RMAN syntax, you can specify different section sizes for different files in the same backup job. Note: You cannot use SECTION SIZE with MAXPIECESIZE or with INCREMENTAL LEVEL 1.
COMPRESSED enables binary compression. 
RMAN compresses the data written into the backup set to reduce the overall size of the backup set. All backups that create backup sets can create compressed backup sets. Restoring compressed backup sets is no different from restoring uncompressed backup sets. 
RMAN applies a binary compression algorithm as it writes data to backup sets. This compression is similar to the compression provided by many media manager vendors. When backing up to a locally attached tape device, compression provided by the media management vendor is usually preferable to the binary compression provided by BACKUP AS COMPRESSED BACKUPSET. 
Therefore, use uncompressed backup sets and turn on the compression provided by the media management vendor when backing up to locally attached tape devices. You should not use RMAN binary compression andmedia manager compression together. 
Some CPU overhead is associated with compressing backup sets. If the target database is running at or near its maximum load, then you may find the overhead unacceptable. In most other circumstances, compressing backup sets saves enough disk space to be worth the CPU overhead. 
SECTION SIZE sizeSpec  Specifies the size of each backup section produced during a data file backup. 
By setting this parameter, RMAN can create a multisection backup. In a multisection backup, RMAN creates a backup piece that contains one file section, which is a contiguous range of blocks in a file. All sections of a multisection backup are the same size. You can create a multisection backup for a data file, but not a data file copy. 
File sections enable RMAN to create multiple steps for the backup of a single large data file. 
RMAN channels can process each step independently and in parallel, with each channel producing one section of a multisection backup set. 
If you specify a section size that is larger than the size of the file, then RMAN does not use multisection backup for the file. If you specify a small section size that would produce more than 256 sections, then RMAN increases the section size to a value that results in exactly 256 sections. 
Depending on where you specify this parameter in the RMAN syntax, you can specify different section sizes for different files in the same backup job. 
Note: You cannot use SECTION SIZE with MAXPIECESIZE or with INCREMENTAL LEVEL 1.









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