NO.16 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? (Choose two.)
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.
NO.17 Your multitenant container database (CDB) contains pluggable databases (PDBs), you are connected to the HR_PDB. You execute the following command:
SQL > CREATE UNDO TABLESPACE undotb01
DATAFILE 'u01/oracle/rddb1/undotbs01.dbf' SIZE 60M AUTOEXTEND ON; What is the result?
A. It executes successfully and creates an UNDO tablespace in HR_PDB.
B. It falls and reports an error because there can be only one undo tablespace in a CDB.
C. It fails and reports an error because the CONTAINER=ALL clause is not specified in the command.
D. It fails and reports an error because the CONTAINER=CURRENT clause is not specified in the command.
E. It executes successfully but neither tablespace nor the data file is created.
Answer: E
Explanation:
Interesting behavior in 12.1.0.1 DB of creating an undo tablespace in a PDB.
With the new Multitenant architecture the undo tablespace resides at the CDB level and PDBs all share the same UNDO tablespace.
When the current container is a PDB, an attempt to create an undo tablespace fails without returning an error.
NO.18 Your database is running in ARCHIVELOG mode. You want to take a consistent whole database backup.
Which two statements are true in this scenario? (Choose two.)
A. The user-managed backup consists of only formatted data blocks.
B. The database must be shut down to take a user-managed backup.
C. The RMAN backup contains only data files.
D. The RMAN backup can be performed while the database is open.
E. The database must be in MOUNT state to take RMAN backup.
Answer: A,B
NO.19 For which three requirements would you use the Database Resource Manager? (Choose three.)
A. specifying an idle time limit that applies to sessions that are idle and blocking other sessions
B. limiting the degree of parallelism of operations performed by user sessions in a consumer group
C. specifying the maximum number of concurrent sessions allowed for a user
D. limiting the CPU used per database call
E. specifying the amount of private space a session can allocate in the shared pool of the SGA.
Answer: A,B,C Explanation:
References: http://docs.oracle.com/cd/B19306_01/server.102/b14231/dbrm.htm
NO.20 A redaction policy was added to the SAL column of the SCOTT.EMP table:
All users have their default set of system privileges.
For which three situations will data not be redacted? (Choose three.)
A. SYS sessions, regardless of the roles that are set in the session
B. SYSTEM sessions, regardless of the roles that are set in the session
C. SCOTT sessions, only if the MGR role is set in the session
D. SCOTT sessions, only if the MGR role is granted to SCOTT
E. SCOTT sessions, because he is the owner of the table
F. SYSTEM session, only if the MGR role is set in the session
Answer: A,B,D
NO.21 Which three statements are true about checkpointing? (Choose three.)
A. It prompts the Checkpoint (CKPT) process to write data to the data files and redo information to the online redo log files.
B. It ensures that all dirty buffers are written to data files during consistent shutdown.
C. It reduces the time required for recovery in case of an instance failure.
D. Frequent thread checkpoints can degrade database performance.
E. It prompts the Database Writer (DBWn) process to write checkpoint information into data file headers and the control file.
Answer: B,C,D
NO.22 Your database instance has the following parameter setting:
OS_AUTHENT_PREFIX = OPS$
You execute the following command:
And then grant OPS$GUEST_USER the CREATE SESSION privilege. Which two statements are true? (Choose two.)
A. GUEST_USER can query the tables created in the USERS tablespace by default.
B. The authentication details for GUEST_USER are stored in the database password file.
C. A local GUEST_USER OS account should exist before GUEST_USER can log on to the database.
D. GUEST_USER can log on to the database without specifying a username and password.
E. GUEST_USER is forced to change the password at the first login.
Answer: C,D
NO.23 You determine that database performance is sub-optimal due to hard parsing statements. Automatic Shared Memory Management (ASMM) is disabled for your database instance.
Which tool would you use to get advice on how to improve performance?
A. Memory Advisor for the PGA
B. SQL Access Advisor
C. Memory Advisor for the shared pool
D. SQL Tuning Advisor
Answer: C
Explanation:
References: http://docs.oracle.com/cd/E25178_01/server.1111/e10897/montune.htm#CHDGFCFJ
NO.24 Your database is open in read/write mode and multiple users are connected to the database instance.
You execute the following command:
SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION; What would be the effect on current sessions?
A. They are not terminated but may only issue queries.
B. They are not affected.
C. They are terminated immediately.
D. They are terminated after completing the transaction.
Answer: B
NO.25 You are connected to a pluggable database (PDB) as a common user with DBA privileges. The STATISTICS_LEVEL parameter is PDB_MODIFIABLE. You execute the following:
SQL > ALTER SYSTEM SET STATISTICS_LEVEL = ALL SID = '*' SCOPE = SPFILE; Which is true about the result of this command?
A. The STATISTICS_LEVEL parameter is set to all whenever this PDB is re-opened.
B. The STATISTICS_LEVEL parameter is set to ALL whenever any PDB is reopened.
C. The STATISTICS_LEVEL parameter is set to all whenever the multitenant container database (CDB) is restarted.
D. Nothing happens; because there is no SPFILE for each PDB, the statement is ignored.
Answer: A
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? (Choose two.)
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.
NO.17 Your multitenant container database (CDB) contains pluggable databases (PDBs), you are connected to the HR_PDB. You execute the following command:
SQL > CREATE UNDO TABLESPACE undotb01
DATAFILE 'u01/oracle/rddb1/undotbs01.dbf' SIZE 60M AUTOEXTEND ON; What is the result?
A. It executes successfully and creates an UNDO tablespace in HR_PDB.
B. It falls and reports an error because there can be only one undo tablespace in a CDB.
C. It fails and reports an error because the CONTAINER=ALL clause is not specified in the command.
D. It fails and reports an error because the CONTAINER=CURRENT clause is not specified in the command.
E. It executes successfully but neither tablespace nor the data file is created.
Answer: E
Explanation:
Interesting behavior in 12.1.0.1 DB of creating an undo tablespace in a PDB.
With the new Multitenant architecture the undo tablespace resides at the CDB level and PDBs all share the same UNDO tablespace.
When the current container is a PDB, an attempt to create an undo tablespace fails without returning an error.
NO.18 Your database is running in ARCHIVELOG mode. You want to take a consistent whole database backup.
Which two statements are true in this scenario? (Choose two.)
A. The user-managed backup consists of only formatted data blocks.
B. The database must be shut down to take a user-managed backup.
C. The RMAN backup contains only data files.
D. The RMAN backup can be performed while the database is open.
E. The database must be in MOUNT state to take RMAN backup.
Answer: A,B
NO.19 For which three requirements would you use the Database Resource Manager? (Choose three.)
A. specifying an idle time limit that applies to sessions that are idle and blocking other sessions
B. limiting the degree of parallelism of operations performed by user sessions in a consumer group
C. specifying the maximum number of concurrent sessions allowed for a user
D. limiting the CPU used per database call
E. specifying the amount of private space a session can allocate in the shared pool of the SGA.
Answer: A,B,C Explanation:
References: http://docs.oracle.com/cd/B19306_01/server.102/b14231/dbrm.htm
NO.20 A redaction policy was added to the SAL column of the SCOTT.EMP table:
All users have their default set of system privileges.
For which three situations will data not be redacted? (Choose three.)
A. SYS sessions, regardless of the roles that are set in the session
B. SYSTEM sessions, regardless of the roles that are set in the session
C. SCOTT sessions, only if the MGR role is set in the session
D. SCOTT sessions, only if the MGR role is granted to SCOTT
E. SCOTT sessions, because he is the owner of the table
F. SYSTEM session, only if the MGR role is set in the session
Answer: A,B,D
NO.21 Which three statements are true about checkpointing? (Choose three.)
A. It prompts the Checkpoint (CKPT) process to write data to the data files and redo information to the online redo log files.
B. It ensures that all dirty buffers are written to data files during consistent shutdown.
C. It reduces the time required for recovery in case of an instance failure.
D. Frequent thread checkpoints can degrade database performance.
E. It prompts the Database Writer (DBWn) process to write checkpoint information into data file headers and the control file.
Answer: B,C,D
NO.22 Your database instance has the following parameter setting:
OS_AUTHENT_PREFIX = OPS$
You execute the following command:
And then grant OPS$GUEST_USER the CREATE SESSION privilege. Which two statements are true? (Choose two.)
A. GUEST_USER can query the tables created in the USERS tablespace by default.
B. The authentication details for GUEST_USER are stored in the database password file.
C. A local GUEST_USER OS account should exist before GUEST_USER can log on to the database.
D. GUEST_USER can log on to the database without specifying a username and password.
E. GUEST_USER is forced to change the password at the first login.
Answer: C,D
NO.23 You determine that database performance is sub-optimal due to hard parsing statements. Automatic Shared Memory Management (ASMM) is disabled for your database instance.
Which tool would you use to get advice on how to improve performance?
A. Memory Advisor for the PGA
B. SQL Access Advisor
C. Memory Advisor for the shared pool
D. SQL Tuning Advisor
Answer: C
Explanation:
References: http://docs.oracle.com/cd/E25178_01/server.1111/e10897/montune.htm#CHDGFCFJ
NO.24 Your database is open in read/write mode and multiple users are connected to the database instance.
You execute the following command:
SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION; What would be the effect on current sessions?
A. They are not terminated but may only issue queries.
B. They are not affected.
C. They are terminated immediately.
D. They are terminated after completing the transaction.
Answer: B
NO.25 You are connected to a pluggable database (PDB) as a common user with DBA privileges. The STATISTICS_LEVEL parameter is PDB_MODIFIABLE. You execute the following:
SQL > ALTER SYSTEM SET STATISTICS_LEVEL = ALL SID = '*' SCOPE = SPFILE; Which is true about the result of this command?
A. The STATISTICS_LEVEL parameter is set to all whenever this PDB is re-opened.
B. The STATISTICS_LEVEL parameter is set to ALL whenever any PDB is reopened.
C. The STATISTICS_LEVEL parameter is set to all whenever the multitenant container database (CDB) is restarted.
D. Nothing happens; because there is no SPFILE for each PDB, the statement is ignored.
Answer: A