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Q1. Examine the parameter for your database instance:

You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan:

Identify the reason why the optimizer chose different execution plans.

A. The optimizer used a dynamic plan for the query.

B. The optimizer chose different plans because automatic dynamic sampling was enabled. 

C. The optimizer used re-optimization cardinality feedback for the query.

D. The optimizer chose different plan because extended statistics were created for the columns used. 

Answer: B


Q2. Examine the parameters for your database instance:

Which three statements are true about the process of automatic optimization by using cardinality feedback?

A. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.

B. The optimizer can re optimize a query only once using cardinality feedback.

C. The optimizer enables monitoring for cardinality feedback after the first execution of a query.

D. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled. 

E. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.

Answer: ACD


Q3. 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: ADE


Q4. You execute the following piece of code with appropriate privileges:

User SCOTT has been granted the CREATE SESSION privilege and the MGR role. 

Which two statements are true when a session logged in as SCOTT queries the SAL column in the view and the table?

A. Data is redacted for the EMP.SAL column only if the SCOTT session does not have the MGR role set.

B. Data is redacted for EMP.SAL column only if the SCOTT session has the MGR role set.

C. Data is never redacted for the EMP_V.SAL column.

D. Data is redacted for the EMP_V.SAL column only if the SCOTT session has the MGR role set.

E. Data is redacted for the EMP_V.SAL column only if the SCOTT session does not have the MGR role set.

Answer: AC 


Q5. Examine the following command;

ALTER SYSTEM SET enable_ddl_logging = TRUE;

Which statement is true?

A. Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.

B. All DDL commands are logged in the alert log file.

C. All DDL commands are logged in a different log file that contains DDL statements and their execution dates.

D. Only DDL commands that resulted in the creation of new segments are logged. 

E. All DDL commands are logged in XML format in the alert directory under the Automatic Diagnostic Repository (ADR) home.

Answer: C


Q6. In order to exploit some new storage tiers that have been provisioned by a storage administrator, the partitions of a large heap table must be moved to other tablespaces in your Oracle 12c database?

Both local and global partitioned B-tree Indexes are defined on the table.

A high volume of transactions access the table during the day and a medium volume of transactions access it at night and during weekends.

Minimal disrupt ion to availability is required. 

Which three statements are true about this requirement?

A. The partitions can be moved online to new tablespaces.

B. Global indexes must be rebuilt manually after moving the partitions.

C. The partitions can be compressed in the same tablespaces.

D. The partitions can be compressed in the new tablespaces.

E. Local indexes must be rebuilt manually after moving the partitions.

Answer: ACD


Q7. Which three resources might be prioritized between competing pluggable databases when creating a multitenant container database plan (CDB plan) using Oracle Database Resource Manager?

A. Maximum Undo per consumer group

B. Maximum Idle time

C. Parallel server limit

D. CPU

E. Exadata I/O

F. Local file system I/O

Answer: CDE


Q8. The persistent configuration settings for RMAN have default for all parameters. Identify four RMAN commands that produce a multi-section backup.

A. BACKUP TABLESPACE SYSTEM SECTION SIZE 100M;

B. BACKUP AS COPY TABLESPACE SYSTEM SECTION SIZE 100M;

C. BACKUP ARCHIVELOG ALL SECTION SIZE 25M;

D. BACKUP TABLESPACE "TEMP" SECTION SIZE 10M;

E. BACKUP TABLESPACE "UNDO" INCLUDE CURRENT CONTROLFILE SECTION SIZE 100M;

F. BACKUP SPFILE SECTION SIZE 1M;

G. BACKUP INCREMENTAL LEVEL 0 TABLESPACE SYSAUX SECTION SIZE 100M;

Answer: ABEG


Q9. Which three activities are supported by the Data Recovery Advisor?

A. Advising on block checksum failures

B. Advising on inaccessible control files

C. Advising on inaccessible block change tracking files

D. Advising on empty password files

E. Advising on invalid block header field values

Answer: ABE


Q10. You executed this command to create a password file:

$ orapwd file = orapworcl entries = 10 ignorecase = N 

Which two statements are true about the password file?

A. It will permit the use of uppercase passwords for database users who have been granted the SYSOPER role.

B. It contains username and passwords of database users who are members of the OSOPER operating system group.

C. It contains usernames and passwords of database users who are members of the OSDBA operating system group.

D. It will permit the use of lowercase passwords for database users who have granted the SYSDBA role.

E. It will not permit the use of mixed case passwords for the database users who have been granted the SYSDBA role.

Answer: AD