1Z0-083 Practice Exam — Free Oracle Certification Prep

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Question 1

Monitoring and Tuning Database Performance

Which two are true about gathering optimizer statistics? (Choose two.)

A Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics in all open PDBs except PDB$SEED.
B Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to a PDB opened in read/write mode gathers object statistics for that PDB.
C Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics only in CDB$ROOT.
D System statistics can be gathered only while connected to CDB$ROOT.
E Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics in all open pluggable databases (PDBs)

Question 2

Diagnosing Failures

Question 3

Using Flashback Technologies

Question 4

Using Flashback Technologies

Question 5

Using General Overall Database Enhancements

Question 6

RMAN Troubleshooting and Tuning

Question 7

Using Diagnosibility Enhancements

Question 8

Install Grid Infrastructure and Oracle Database

Question 9

Using General Overall Database Enhancements

Question 10

Using Diagnosibility Enhancements

Question 11

Using General Overall Database Enhancements

Question 12

Duplicating a Database

Question 13

Monitoring and Tuning Database Performance

Question 14

Transporting Data

Question 15

Monitoring and Tuning Database Performance

Question 16

Monitoring and Tuning Database Performance

Question 17

Transporting Data

Question 18

Patching Grid Infrastructure and Oracle Database

Question 19

Using General Overall Database Enhancements

Question 20

Monitoring and Tuning Database Performance

Question 21

Monitoring and Tuning Database Performance

Question 22

Using Flashback Technologies

Question 23

Configuring and Using RMAN

Question 24

Using General Overall Database Enhancements

Question 25

Using Flashback Technologies

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Examine these queries and their output:

Question Image

After a system crash, an instance restart and an attempted opening of the PDBs result in:

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Which two are true? (Choose two.)

A Data file 24 can be recovered while PDB2 is opened.
B Data file 24 must be recovered while the CDB is opened.
C Data file 24 can be recovered while CDB$ROOT and PDB$SEED are opened.
D Data file 24 cannot be recovered while the CDB is opened.
E Data file 24 must be recovered while PDB2 is closed.

Which two are true about Oracle Flashback features? (Choose two.)

A FLASHBACK QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files.
B FLASHBACK VERSION QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files.
C FLASHBACK TABLE can undrop a column.
D FLASHBACK DROP can undrop an index when undropping a table.
E After a database is restored from flashback logs using the FLASHBACK DATABASE command, it is sometimes rolled forward using redo logs.

Which three are true about requirements for various FLASHBACK operations? (Choose three.)

A FLASHBACK transaction query requires undo to retrieve all versions of a row that existed between two points in time.
B FLASHBACK drop requires that the RECYCLEBIN parameter be set to ON.
C FLASHBACK version query requires that the RECYCLEBIN parameter be set to ON.
D FLASHBACK DATA ARCHIVE requires undo to store all versions of all rows of a table being tracked.
E FLASHBACK drop requires undo to retrieve all versions of a row that existed between two points in time.
F FLASHBACK version query requires undo to retrieve all versions of a row that existed between two points in time.

For which two requirements can you use the USER_TABLESPACE clause with the CREATE PLUGGABLE DATABASE command? (Choose two.)

A to specify a default tablespace in a PDB cloned from another PDB in the same CDB.
B to exclude all tablespaces except SYSTEM, SYSAUX, and TEMP when plugging in a PDB
C to include specific user tablespaces only when relocating a PDB
D to specify the list of user tablespaces to include when moving a non-CDB to a PDB
E to exclude a temp tablespace when plugging in a PDB
F to specify the list of tablespaces to include when creating a PDB from the CDB seed

Question 6

RMAN Troubleshooting and Tuning

Question 7

Using Diagnosibility Enhancements

Question 8

Install Grid Infrastructure and Oracle Database

Question 9

Using General Overall Database Enhancements

Question 10

Using Diagnosibility Enhancements

Question 11

Using General Overall Database Enhancements

Question 12

Duplicating a Database

Question 13

Monitoring and Tuning Database Performance

Question 14

Transporting Data

Question 15

Monitoring and Tuning Database Performance

Question 16

Monitoring and Tuning Database Performance

Question 17

Transporting Data

Question 18

Patching Grid Infrastructure and Oracle Database

Question 19

Using General Overall Database Enhancements

Question 20

Monitoring and Tuning Database Performance

Question 21

Monitoring and Tuning Database Performance

Question 22

Using Flashback Technologies

Question 23

Configuring and Using RMAN

Question 24

Using General Overall Database Enhancements

Question 25

Using Flashback Technologies

While backing up to an SBT channel, you determine that the read phase of your compressed Recovery Manager (RMAN) incremental level 0 backup is a bottleneck.
FORCE LOGGING is enabled for the database.
Which two could improve read performance? (Choose two.)

A Increase the size of tape I/O buffers.
B Disable FORCE LOGGING for the database.
C Increase the size of the database buffer cache.
D Enable asynchronous disk I/O.
E Increase the level of RMAN multiplexing.

Which three are true about thresholds, metrics, and server-generated alerts? (Choose three.)

A All metrics are instance related.
B Cleared stateful alerts are displayed by querying DBA_ALERT_HISTORY.
C A space usage management alert is automatically cleared after the underlying problem is resolved.
D They are generated by SMON when a tablespace is 97% full.
E Metrics are statistical counts for a specific unit.
F STATISTICS_LEVEL must be set to ALL to generate alerts.

Which three actions are performed by the Oracle Preinstallation RPM, oracle-database-server-xxxx-preinstall, for Oracle Grid Infrastructure, where xxxx is the Oracle version and release? (Choose three.)

A performing checks to ensure minimum configuration requirements for Oracle Grid Infrastructure are met
B creating the oracle OS user
C creating the OSDBA (dba) group
D creating the oraInventory (oinstall) group
E creating the grid OS user
F configuring the OS for Oracle Automatic Storage Management shared storage access

Which two are true about common objects? (Choose two.)

A They can be created only in CDB$ROOT.
B They can be only metadata-linked in an application container.
C They can exist in user-defined schemas only in application containers.
D They can exist in CDB$ROOT and an application root.
E They can be extended data-linked in CDB$ROOT.
F They can be created only in an application root.

Which two are true about the Automatic Database Diagnostic Monitor (ADDM)? (Choose two.)

A It analyzes a period of time corresponding to the 12 hours of activity.
B It runs automatically after each AWR snapshot.
C A DBA can run it manually.
D Results are written to the alert log.
E It analyzes a period of time corresponding to the last day of activity.

Which two are true about the character sets used in an Oracle database? (Choose two.)

A Single-byte character sets provide better performance than multibyte character sets.
B Unicode enables information from any language to be stored using a single character set.
C Unicode is the only supported character set for Oracle databases created using Database Configuration Assistant (DBCA).
D Single-byte character sets always use 7-bit encoding schemes.
E Multibyte character sets allow more efficient space utilization than single byte character sets.
F Single-byte character sets always use 8-bit encoding schemes.

Which four are true about duplicating a database using Recovery Manager (RMAN)? (Choose four.)

A Duplication can be done by having the auxiliary database instance pull backup sets from the target database instance.
B A connection to an auxiliary instance is always required.
C A subset of the target database can be duplicated.
D A new DBID is always created for the duplicated database.
E A connection to the recovery catalog instance is always required.
F A backup of the target database is always required.

A user complains about poor database performance.
You want to verify if the user's session has waited for certain types of I/O activity.
Which view displays all waits waited on by a session at least once?

A V$SESSION_EVENT
B V$SESSTAT
C V$SESSION_WAIT
D V$SESSION_WAIT_CLASS
E V$SESSION

You must transport the UNIVERSITY tablespace from one database to another.
The UNIVERSITY tablespace is currently open read/write.
The source and destination platforms have different endian formats.
Examine this list of actions:

Make the UNIVERSITY tablespace read-only on the source system.
Export the UNIVERSITY tablespace metadata using EXPDP.
Convert the UNIVERSITY tablespace data files to the destination platform format using RMAN on the source system.
Copy the UNIVERSITY tablespace data files to the destination system.
Copy the Data Pump dump set to the destination system.
Convert the UNIVERSITY tablespace data files to the destination platform format using RMAN on the destination system.
Import the UNIVERSITY tablespace metadata using IMPDP.
Make the UNIVERSITY tablespace read/write on the destination system.
Which is the minimum number of actions required, in the correct order, to transport the UNIVERSITY tablespace?

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

Which three are true about Optimizer Statistics Advisor? (Choose three.)

A It can be run only manually.
B It is part of the DBMS_ADVISOR package.
C It can recommend changes to improve the statistics gathering process.
D It always analyzes all schemas in the database.
E It runs automatically every night by default.
F It is part of the DBMS_STATS package.

Which three are true about monitoring waits for sessions and services? (Choose three.)

A V$SESSION_EVENT displays all waits for all past and existing sessions if the wait has occurred at least once for a session.
B V$SERVICE_EVENT displays all waits for all services if the wait has occurred at least once for a service.
C V$SESSION_WAIT_CLASS displays waits broken down by wait class only for waiting sessions.
D V$SESSION_WAIT and V$SESSION both contain details of the event on which a non-waiting session last waited.
E V$SESSION_EVENT displays all waits for all past sessions if the wait has occurred at least once for a session.
F V$SESSION_WAIT and V$SESSION both contain details of the event on which a session is currently waiting.

Which three are true about transporting databases across platforms using Recovery Manager (RMAN) image copies? (Choose three.)

A By default, the transported database will use Oracle Managed Files (OMF)
B Data files can be converted on the destination system.
C Data files can be converted on the source system.
D A new DBID is automatically created for the transported database.
E Databases can be transported between systems with different endian formats.
F The password file is automatically converted by RMAN.

Which three are true about opatchauto? (Choose three.)

A It performs a shutdown and then a restart of all processes in both Oracle Grid Infrastructure and Oracle Database home during the patching process.
B It must be invoked by a user with root user privileges.
C Patches are applied via opatchauto.
D Users must always input patch plans to opatchauto.
E It requires the Oracle Grid Infrastructure and Oracle Database instances to be shut down before being invoked.
F It applies patches in nonrolling mode by default.

Which two are true about the execution of operating system scripts starting from Oracle Database 19c? (Choose two.)

A orainstRoot.sh can be executed automatically by the Database installer by using sudo or root credentials.
B root.sh can be executed automatically by the Database Installer only if it is provided with root credentials.
C The sudo password can be specified in a response file.
D root.sh can be executed automatically by the Database installer only by using sudo credentials.
E The sudo password must be specified in a response file.
F The root password cannot be specified in a response file.

Examine this output:

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Which two are true? (Choose two.)

A Any PDB not specified in the plan will be unable to execute statements in parallel.
B PDB3 can use all available parallel execution processes at times.
C PDB1 is always limited to 40% of the available system resources regardless of demand.
D Any PDB not specified in the plan will be able to use a maximum of 16.5% of the available system resources.
E PDB3 is guaranteed to receive at least 20% of the available system resources if there is enough demand.
F PDB2 is guaranteed at least 25% of the available parallel execution processes if there is enough demand.

Automatic Shared Memory Management is disabled for one of your database instances.
Some SQL statements perform poorly due to excessive hard parse activity, thereby degrading performance.
What would be your next step?

A Run the SQL Access Advisor.
B Run the Memory Advisor for the shared pool.
C Run the SQL Tuning Advisor.
D Run the Memory Advisor for the Program Global Area.
E Run the Memory Advisor for the System Global Area.

Which two are true about flashback features in Oracle Database 19c and later releases? (Choose two.)

A Flashback logs are automatically purged when DB_FLASHBACK_RETENTION_TARGET is set lower than the time they have already been retained.
B Flashback logs are monitored and proactively deleted when beyond the retention period defined in DB_FLASHBACK_RETENTION_TARGET only after there is space pressure.
C Flashback logs are monitored and proactively deleted when beyond the retention period defined in DB_FLASHBACK_RETENTION_TARGET before there is space pressure.
D Flashback logs are monitored for being older than the retention period defined in DB_FLASHBACK_RETENTION_TARGET and can be deleted by an administrator written event trigger.
E Flashback logs are automatically purged whenever the value of DB_FLASHBACK_RETENTION_TARGET is changed.

Which two are true about RMAN duplexed backup sets? (Choose two.)

A A duplexed backup set uses the same number of SBT channels as a non-duplexed backup set for the same number of files.
B A non-duplexed backup set written to disk can be duplexed to disk by backing up the backup set that is already on disk.
C A non-duplexed backup set written to SBT can be duplexed to tape by backing up the backup set that is already on tape.
D A non-duplexed backup set written to disk can be duplexed to tape by backing up the backup set that is already on disk.
E A non-duplexed backup set written to SBT can be duplexed to disk by backing up the backup set that is already on tape.
F A duplexed backup set always uses twice as many SBT channels as a non-duplexed backup set for the same number of files.

You are managing this configuration:

CDB1 is a container database.
PDB1 and PDB2 are two pluggable databases in CDB1.
USER1.EMP is a table in PDB1 and USER2.DEPT is a table in PDB2.
CDB1 user SYS executes these commands after connecting successfully to PDB2:

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Which two are true? (Choose two.)

A The inserts on USER1.EMP remain uncommitted when the session connected to PDB2.
B The inserts on USER1.EMP were committed when the session inserted a row into USER2.DEPT.
C The insert on USER2.DEPT fails because of the active transaction in the parent container.
D The insert on USER2.DEPT is a recursive autonomous transaction by the child session and is committed.
E The inserts on USER1.EMP were rolled back when the session connected to PDB2.
F The insert on USER2.DEPT is uncommitted.

Which two are true about changing the LOCAL_UNDO_ENABLED property to false in a CDB? (Choose two.)

A After the change, only a common user with the required privilege can create an undo tablespace in CDB&ROOT.
B Any new PDB and existing PDBs are automatically configured to use the default undo tablespace in CDB$ROOT.
C After the change, only one undo tablespace can exist in CDB$ROOT.
D After the change, any user with the required privilege can create an undo tablespace in the PDBs.
E Undo tablespaces existing in PDBs must be dropped before the change.
F After the change, each existing PDB has to be reopened for the new undo mode to take effect.

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