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Oracle 1z0-083 Sample Questions

Question # 1

Choose the best answer. Examine this configuration: 1. CDB1 is an Oracle Database 12c Release 2 container database (CDB). 2. PDB1 and PDB2 are two pluggable databases (PDBs) in CDB1. After successfully performing all the preupgrade tasks, you execute these commands from the Oracle Database 18c environment: $ export ORACLE_SID=cdb1 $ sqlplus / as sysdba SQL> STARTUP UPGRADE; SQL> SHOW pdbs CON_ID CON_NAME OPEN MODE RESTRICTED -------------------------------------------------¬------------- 2 PDB$SEED 3 PDB1 4 PDB2 MIGRATE YES MOUNTED YES MOUNTED YES SQL> ALTER PLUGGABLE DATABASE pdb1 OPEN UPGRADE; Pluggable database altered. SQL> exit $ $ORACLE_HOME/perl/bin/perl catctl.pl -C 'PDB2' What is the outcome? 

A. It fails because PDB$SEED is in MIGRATE state. 
B. Only CDB$ROOT, PDB$SEED, and PDB1 are upgraded. 
C. Only CDB$ROOT, PDB$SEED, and PDB2 are upgraded. 
D. It fails because PDB2 is not in UPGRADE state. 
E. CDB$ROOT, PDB$SEED, PDB1, and PDB2 are upgraded. 
F. Only CDB$ROOT and PDB$SEED are upgraded. 

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Question # 2

choose three Identify three reasons for using a recovery catalog with Recovery Manager (RMAN). 

A. to allow database duplication without a connection to the target instance. 
B. to store backup metadata that would cause the controlfile to become too large. 
C. to store backups that would cause the controlfile to become too large. 
D. to report on the database schema at an earlier point in time. 
E. to allow database duplication without a connection to the auxiliary instance. 

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Question # 3

Choose the best answer. You want to transport the UNIVERSITY tablespace from one database to another. The UNIVERSITY tablespace is currently open read/write. The source and destination platforms have the same endian Examine this list of steps:. 1. Make the UNIVERSITY tablespace read-only on the source 2. Export the UNIVERSITY tablespace metadata using EXPDP. 3. Create a cross-platform backup set from the UNIVERSITY source system, using an RMAN command that includes the DATAPUMP clause. 4. Copy the cross-platform backup sets to the destination system. 5. Copy the Data Pump dump set from the source to the destination system. 6. Restore the cross-platform backup set on the destination system using an RMAN command that includes the DATAPUMP clause. 7. Import the UNIVERSITY tablespace metadata using IMPDP. 8. Make the UNIVERSITY tablespace read/write on the destination system. Which are the minimum number of steps required, in the correct order, to transport the UNIVERSITY tablespace? 

A. 3,4,6 
B. 2,3,4,5,6,7 
C. 1,3,4,6,8 
D. 1,2,3,4,5,6,7,8 

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Question # 4

choose three Which three RMAN persistent settings can be set explicitly? 

A. SPFILE backup duplexing 
B. control file auto backup formats 
C. archive log deletion policy 
D. image copy duplexing 
E. redo log backup duplexing 
F. archive log backup duplexing 

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Question # 5

Choose three. Which three are true about Oracle Grid Infrastructure for a Standalone Server? 

A. It requires Oracle ASMLib to manage Automatic Storage Management (ASM) disks. C,D
B. It creates one disk group during installation. 
C. It includes both Oracle Restart and Oracle Automatic Storage Management (ASM) software. 
D. Automatic Storage Management (ASM) requires that O/S groups OSASM and OSDBA be assigned as secondary groups for its installation owner. 
E. It requires Oracle ASM Fitter Driver (ASMFD) to manage Automatic Storage Management (ASM) disks. 
F. It requires the operating system ORACLE_BASE environment variable to be predefined before installation. 

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Question # 6

While backing up to the Oracle Fast Recovery Area (FRA), you determined the backup istaking too long and suspect a performance bottleneck. Which three are true about diagnosing and tuning these problems? (Choose three.) 

A. If an RMAN BACKUP VALIDATE command takesroughly the same time as an actual backup, then both read and write I/O are likely bottlenecks. 
B. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using synchronous I/O. 
C. If an RMAN BACKUP VALIDATE command takes noticeably lessthan an actual backup, then write I/O is a likely bottleneck. 
D. If an RMAN BACKUP VALIDATE command takesroughly the same time as an actual backup, then read I/O is a likely bottleneck. 
E. Data files with a high value in V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECOND are a potential performance bottleneck when synchronous I/O is used.
 F. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using asynchronous I/O/ 
G. Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a potential performance bottleneck when asynchronous I/O is used. 

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Question # 7

Choose two. Which two are true about the SQL Tuning Advisor? 

A. It can recommend semantic changes to SQL statements. 
B. It prevents performance regressions for SQL statements when changes are made.
 C. It checks each query being analyzed for missing or stale statistics. 
D. It considers all SQL statements being analyzed by the advisor task as a group. 
E. It only recommends syntactic changes to SQL statements. 

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Question # 8

Which three conditions must be met before you create a Virtual Private Catalog (VPC)? 

A. A base recovery catalog should exist. 
B. The owner of VPC cannot own recovery catalog. 
C. At least one target database should be registered in the recovery catalog. 
D. The register database privilege should be granted to the virtual catalog owner. 
E. The recovery_catalog_owner role should be granted to the virtual catalog owner. 

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Question # 9

Choose the best answer. Which statement correctly describes the SQL profiling performed by the SQL Tuning Advisor? 

A. It is a set of recommendations by the optimizer to change the access methods used. 
B. It is auxiliary information collected by the optimizer for a SQL statement to eliminat estimation error.
C. It is a set of recommendations by the optimizer to restructure a SQL statement to avoid suboptimal execution plans. 
D. It is auxiliary information collected by the optimizer for a SQL statement to help use better joins orders. 
E. It is a set of recommendations by the optimizer to create new indexes. 

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Question # 10

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

A. Compare Period ADDM report 
B. AWR Compare Period report 
C. Active Session History (ASH) report 
D. Taking a new snapshot and comparing it with a preserved snapshot. 

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Question # 11

Choose two. Which two are true about monitoring waits for sessions and services? 

A. V$SERVICE_EVENT displays wait counts for every wait event for each service even including counts of zero for waits that never occurred.
 B. V$SESSION_WAIT and V$SESSION both contain details of the event on which a nonwaiting session last waited. 
C. V$SESSION_WAIT and V$SESSION both contain details of the event on which a waiting session is currently waiting. 
D. V$SESSION_EVENT displays all waits events for those events that have occurred at least once for sessions that have now terminated.
E. V$SESSION_WAIT_CLASS displays waits broken down by wait class only for terminated sessions. 

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Question # 12

Choose the best answer. Examine this configuration: 1. CDB1 is a container database. 2. APP_ROOT is an application root in CDB1. 3. APP_PDB1 is an application PDB in APP_ROOT. 4. FLASHBACK DATABASE is ON. You execute these commands: $ sqlplus sys/orac1e_4U@localhost:1521/cdb1 SQL> SELECT current_scn FROM v$database; CURRENT_SCN -----------------------2074756 SQL> CREATE TABLE cdb1_tab(c1 NUMBER) ; Table created. SQL> ALTER SESSION SET CONTAINER=app_root; Session altered. SQL> CREATE TABLE app_root_tab (c1 NUMBER) ; Table created. SQL> ALTER SESSION SET CONTAINER=app_pdb1; Session altered. SQL> CREATE TABLE app_pdb1_tab (c1 NUMBER) ; Table created. SQL> conn / as sysdba Connected. SQL> ALTER PLUGGABLE DATABASE app_root CLOSE; Pluggable database altered. SQL> FLASHBACK PLUGGABLE DATABASE app_root TO SCN 2074756; Flashback complete. Which table or set of tables will exist after the Flashback operation has completed? 

A. CDB1_TAB, APP_ROOT_TAB, and APP_PDB1_TAB 
B. CDB1_TAB and APP_PDB1_TAB 
C. CDB1_TAB and APP_ROOT_TAB 
D. CDB1_TAB only 
E. none of the tables, because all three tables will be dropped 

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Question # 13

Choose the best answer. How do you configure a CDB for local undo mode? 

A. Open the CDB instance in restricted mode. In CDB$ROOT, drop the UNDO tablespace. Execute ALTER DATABASE LOCAL UNDO ON in each PDB, and then restart the CDB instance. 
B. Open the CDB instance in upgrade mode. In CDB$ROOT, execute ALTER DATABASE LOCAL UNDO ON, and then restart the CDB instance. 
C. Open the CDB instance in upgrade mode. In each PDB, execute ALTER DATABASE LOCAL UNDO ON, create an UNDO tablespace, and then restart the CDB instance. 
D. Open the CDB instance in restricted mode. In CDB$ROOT, execute ALTER DATABASE LOCAL UNDO ON. create an UNDO tablespace in each PDB, and then restart the CDB instance. 
E. Open the CDB in read-only mode. In CDB$ROOT, execute ALTER DATABASE LOCAL UNDO ON, and then change the CDB to read/write mode. 

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