Oracle 1Z0-083問題集で必ず試験合格させる [Q23-Q46]

Oracle 1Z0-083問題集で必ず試験合格させる

1Z0-083試験問題（更新されたのは2025年）100%リアル問題解答

Oracle 1Z0-083試験では、Oracleデータベース管理に関連する幅広いトピックをカバーしています。これらには、バックアップと回復戦略、データベースのチューニングとパフォーマンスの最適化、データベースセキュリティ、および高度なデータベース管理タスクが含まれます。候補者は、これらのトピックを完全に理解し、実際のシナリオに知識を適用できる必要があります。

質問 # 23
Examine this output:

Which two are true?

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

正解：B、F

質問 # 24
Which two are true about gathering optimizer statistics? (Choose two.)

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

正解：D、E

解説：
Explanation
https://mikedietrichde.com/2016/10/21/gather-fixed-objects-stats-in-pdbs-as-well/#:~:text=Yes%2C%20you'll%2
.

質問 # 25
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. configuring the OS for Oracle Automatic Storage Management shared storage access
B. creating the grid OS user
C. creating the oracle OS user
D. performing checks to ensure minimum configuration requirements for Oracle Grid Infrastructure are met
E. creating thte oraInventory (oinstall) group
F. creating the OSDBA (dba) group

正解：A、E、F

質問 # 26
After implementing full Oracle Data Redaction, you change the default value for the NUMBER data type as follows: SQL> select number_value from REDACTION_VALUES_FOR_TYPE_FULL; NUMBER_VALUE ------------0 SQL> exec DBMS_REDACT.UPDATE_FULL_REDACTION_VALUES(-1); SQL> select number_value from REDACTION_VALUES_FOR_TYPE_FULL; NUMBER_VALUE -------------1 After changing the value, you notice that FULL redaction continues to redact numeric data with zero.What must you do to activate the new default value for numeric full redaction?

A. Re-connect the sessions that access objects with redaction policies defined on them.
B. Re-createredactionpoliciesthatuseFULLdataredaction.
C. Re-enableredactionpoliciesthatuseFULLdataredaction.
D. Restart the database instance. Correct
E. Flushthesharedpool.

正解：D

質問 # 27
Which three are true about thresholds, metrics, and server-generated alerts? (Choose three.)

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

正解：C、D、F

解説：
Reference:
https://docs.oracle.com/cd/E11882_01/server.112/e41573/autostat.htm#PFGRF027 https://blogs.oracle.com/oem/how-to-clear-an-alert-v2

質問 # 28
Examine this configuration:
* CDB1 is a container database.
* PDB1 and PDB2 are pluggable databases in CDB1.
* PDB1 and PDB2 are OPEN in READ WRITE mode.
You execute these commands successfully:

Which two are true? (Choose two.)

A. CDB1 is in MOUNT state
B. Uncommitted transactions in PDB1 have been rolled back.
C. Uncommitted transactions in CDB1 and PDB1 have been rolled back.
D. PDB1 is closed.
E. CDB1 is shut down.

正解：A、D

質問 # 29
A schema owner truncated a table in error and must recover the data.
Which Oracle Flashback feature could be used to recover the data?

A. FLASHBACK VERSION QUERY
B. FLASHBACK DATA ARCHIVE
C. FLASHBACK TABLE
D. FLASHBACK TRANSACTION
E. FLASHBACK DATABASE

正解：E

解説：
Backup and Recovery Workshop - typical scenario for Flashback Database is truncate table.
You may use FBDA but in different way (not flashing back):
insert into t1_recovered
select * from t1
as of timestamp sysdate - 1/24;

質問 # 30
Which three are true about monitoring waits for sessions and services? (Choose three.)

A. V$SESSION_EVENT displays all waits for all past sessions if the wait has occurred at least once for a session.
B. V$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_EVENT displays all waits for all past and existing sessions if the wait has occurred at least once for a session.
E. V$SESSION_WAIT and V$SESSION both contain details of the event on which a session is currently waiting.
F. V$SESSION_WAIT and V$SESSION both contain details of the event on which a non-waiting session last waited.

正解：B、E、F

解説：
A, E - False : V$SESSION_EVENT displays information on waits for an event by a session.
V$SESSION_WAIT_HISTORY displays the last 10 wait events for each active session.
B - V$SERVICE_EVENT displays aggregated wait counts and wait times for each wait statistic.
C - False : V$SESSION_WAIT_CLASS displays the time spent in various wait event operations on a per-session basis.
D, F - True : V$SESSION_WAIT displays the current or last wait for each session.
V$SESSION.EVENT If the session is currently waiting, then the resource or event for which the session is waiting. If the session is not in a wait, then the resource or event for which the session most recently waited.
Resource :
https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/V-
SESSION_EVENT.html#GUID-5723D404-83F7-4C8D-8BF2-031B3FFEAAA8

質問 # 31
The persistent configuration settings for RMAN have default for all parameters. Identify four RMAN commands that produce a multi-section backup.

A. BACKUP SPFILE SECTION SIZE 1M;
B. BACKUP TABLESPACE "TEMP" SECTION SIZE 10M;
C. BACKUP TABLESPACE "UNDO" INCLUDE CURRENT CONTROLFILE SECTION SIZE
100M;
D. BACKUP TABLESPACE SYSTEM SECTION SIZE 100M;
E. BACKUP INCREMENTAL LEVEL 0 TABLESPACE SYSAUX SECTION SIZE 100M;
F. BACKUP ARCHIVELOG ALL SECTION SIZE 25M;
G. BACKUP AS COPY TABLESPACE SYSTEM SECTION SIZE 100M;

正解：D、E、F、G

質問 # 32
Examine this configuration:
CDB1 is a container database.
PDB1 and PDB2 are pluggable databases in CDB1.
You execute these commands successfully:

Which two are true? (Choose two.)

A. PDB1 and PDB2 are in READ ONLY state.
B. PDB1 and PDB2 are in MOUNT state.
C. Redo logs are opened.
D. CDB$ROOT is in MOUNT state.
E. PDB$SEED is in READ ONLY state.

正解：C、E

質問 # 33
You are working on an Oracle Database 19c database. You enabled the Flashback Database feature. Which two statements regarding flashback logs are true? (Choose two.)

A. Flashback logs need to be cleared manually after you disable Flashback Database.
B. Flashback logs are not archived.
C. Flashback logs are maintained in redo log files.
D. Flashback logs are used to maintain Flashback Database related errors.
E. Flashback logs are maintained in the Flash Recovery Area.

正解：B、E

質問 # 34
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. configuring the OS for Oracle Automatic Storage Management shared storage access
B. creating the grid OS user
C. performing checks to ensure minimum configuration requirements for Oracle Grid Infrastructure are met
D. creating the oracleOS user
E. creating thte oraInventory (oinstall) group
F. creating the OSDBA (dba) group

正解：A、E、F

解説：
Explanation/Reference: https://docs.oracle.com/cd/E11882_01/install.112/e41961/prelinux.htm#CWLIN2932

質問 # 35
Which two are true about instance recovery? (Choose two.)

A. Setting FAST_START_MTTR_TARGET to a lower value reduces instance recovery time by causing dirty buffers to be written to disk more frequently, thereby reducing the number of I/Os needed during instance recovery.
B. It is performed automatically after the database is opened; however, blocks requiring recovery are not available until they are recovered.
C. It is not possible if an archived log is missing.
D. It is performed by the Recovery Writer (RVWR) background process.
E. Setting FAST_START_MTTR_TARGET to a higher value reduces instance recovery time by causing the log writer to write more frquently, thereby reducing the number of I/Os needed during instance recovery.
F. It is performed automatically while the database remains in MOUNT state. Then the database is opened.

正解：E、F

質問 # 36
Which two are true about common objects? (Choose two.)

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

正解：A、D

解説：
A common object is defined in either the CDB root or an application root, and can be referenced using metadata links or object links. A local object is every object that is not a common object.
Database-supplied common objects are defined in CDB$ROOT and cannot be changed. Oracle Database does not support creation of common objects in CDB$ROOT.
You can create most schema objects - such as tables, views, PL/SQL and Java program units, sequences, and so on-as common objects in an application root. If the object exists in an application root, then it is called an application common object.
A local user can own a common object. Also, a common user can own a local object, but only when the object is not data-linked or metadata-linked, and is also neither a metadata link nor a data link.

質問 # 37
Which two are true about gathering optimizer statistics? (Choose two.)

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

正解：D、E

解説：
https://mikedietrichde.com/2016/10/21/gather-fixed-objects-stats-in-pdbs-as-well/#:~:text=Yes%2C%20you'll%20have%20to,independently%20from%20the%20CDB%24ROOT.&text=Oracle%20Database%20automatically%20gathers%20fixed,Automatic%20Optimizer%20Statistics%20Collection%E2%80%9C) .
Reference:
https://docs.oracle.com/en/database/oracle/oracle-database/20/arpls/DBMS_STATS.html

質問 # 38
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 level of RMAN multiplexing.
B. Enable asynchronous disk I/O.
C. Increase the size of the database buffer cache.
D. Disable FORCE LOGGING for the database.
E. Increase the size of tape I/O buffers.

正解：A、B

質問 # 39
An Oracle Database server session has an uncommitted transaction in progress which updated
5000 rows in one table.
In which two situations does the transaction complete, thereby committing the updates?

A. When a DBA issues a successful SHUTDOWN NORMAL statement and the session terminates normally.
B. When a DML statement is executed successfully by the user in the same session.
C. When a DML statement is executed successfully by same user in a different session.
D. When a DDL statement is executed successfully by same user in a different session.
E. When a DDL statement is executed successfully by the user in the same session.

正解：A、E

質問 # 40
Which two are true about Oracle Flashback features? (Choose two.)

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

正解：C、D

質問 # 41
Choose three. The HR_ROOT application container must support the execution of a query on a table shared by application local PDBs PDB1 and PDB2, and remote PDB PDB3. Which three are true?

A. A proxy PDB must exist in the application root in the remote CDB.
B. A database link must exist in the remote CDB referring to the local CDB.
C. The HR_ROOT replica must exist in the remote CDB.
D. PDB3's application root replica must exist in the local CDB.
E. A proxy PDB must exist in the application root in the local CDB.
F. A database link must exist in the local CDB root referring to the remoteCDB.

正解：D、E、F

質問 # 42
Choose three. Which three are true about Oracle Restart?

A. It is used in both clustered and non-clustered environments.
B. The Server Control (SRVCTL) utility can be used to start and stop Oracle Restart.
C. It runs from the Oracle Grid Infrastructure home.
D. You can add and remove components from an Oracle Restart configuration with Server Control (SRVCTL) commands.
E. It can manage Oracle Database instances, Oracle Net Listeners, and Oracle Automatic Storage Management instances.
F. If you shut down a database instance with SQL*Plus, Oracle Restart interprets this as a database failure and attempts to restart the instance.

正解：A、D、E

質問 # 43
Examine these queries and their output:

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

Which two are true? (Choose two.)

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

正解：D、E

解説：
Explanation
19c: PDB SYSTEM or UNDO Tablespace Recovery: The CDB and all other PDBs can be left opened. 1.
Connect to PDB 2. Shutdown abort the PDB, if its not automatically done. sqlplus sys@sales_pdb as sysdba sql> SHUTDOWN ABORT; OR ALTER PLUGGABLE DATABASE CLOSE ABORT; rman target sys@slaes_pdb rman> restore database; rman> recover database; rman> alter pluggable database sales_pdb open;

質問 # 44
Which two are true about the automatic execution of operating system scripts when performing silent mode installation starting from Oracle Database 19c? (Choose two.)

A. Silent install always runs operating scripts automatically.
B. The installer will prompt for the root or sudo password.
C. The response file can specify the root or sudo password.
D. The response file must contain the root or sudo password.
E. The response file can specify the path of the sudo program.

正解：D、E

質問 # 45
Which three are true about Database Point-in-Time Recovery? (Choose three.)

A. The database must be in MOUNT state when performing Database Point-in-Time Recovery.
B. The database must have FLASHBACK DATABASE ON to perform Database Point-in-Time Recovery.
C. The database must be open RESETLOGS after Database Point-in-Time Recovery.
D. The target point for the recovery must be specified as a stime or System Change Number (SCN).
E. The Database must be in ARCHIVELOG mode.
F. Database Point-in-Time Recovery is performed by the Managed Recovery Process (MRP)

正解：B、C、F

質問 # 46
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