100%合格率リアル1z0-076試験成功を掴み取れ！[2026年03月]
Oracle 1z0-076のPDF問題格別な練習Oracle Database 19c: Data Guard Administration
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質問 # 11
Which three are true concerning database states after a successful switchover?
- A. The former primary database will always be open.
- B. If the former primary database became a physical standby database it will be in the same state as the former physical standby database.
- C. If the former primary database became a logical standby database it will be open read-write.
- D. The new primary database will be open read-write.
- E. If the former primary database became a physical standby database it will always be open readonly.
- F. If the former primary database became a logical standby database it will be in mount state.
正解：B、C、D
解説：
After a successful switchover operation in a Data Guard environment, the new primary database (the former standby) will be open read-write (option A). If the former primary database transitions to a logical standby database, it will also be open read-write (option C), allowing it to apply redo data while servicing read-only queries. The former primary, if converted to a physical standby, will adopt the state that the former physical standby database was in prior to the switchover, which can vary based on the configuration prior to the switchover (option D). The state of a physical standby database can range from mounted to open read-only, depending on whether Real-Time Query was enabled. Thus, the exact state will depend on the pre-switchover setup. It's also essential to highlight that options B and E suggest specific states for a former primary turned logical standby, and a former primary turned physical standby, respectively, but these states are not fixed and depend on the configurations set up by the database administrators. References: The answers are corroborated by Oracle's documentation on Data Guard switchovers, specifically in the Oracle Data Guard Concepts and Administration guide, which explains the roles and states of databases in a Data Guard configuration before and after switchovers.
質問 # 12
Examine this list of possible steps:
1. Raise the compatibility level on both databases.
2. Restart SQL Apply on the upgraded logical standby database.
3. Start SQL Apply on the old primary database.
4. Perform a Switchover to the logical standby database.
5. Upgrade the logical standby database.
6. Upgrade the old primary database.
Which is the minimum number of steps in the correct order, to perform a rolling release upgrade of a data guard environment using an existing logical standby database and to enable the new functionality?
- A. 5,2,4,6,3,1
- B. 4,6,5,2,3,1
- C. 5,2,4,3,6,1
- D. 1,5,2,4,6,3
- E. 5,2,4,1
正解：D
解説：
The process of performing a rolling release upgrade in a Data Guard environment using a logical standby database generally involves these steps:
Raise the compatibility level on both databases (1): Ensuring both the primary and logical standby databases are operating with the same and correct compatibility level is essential before starting the upgrade process.
Upgrade the logical standby database (5): Apply the database upgrade to the logical standby first, which allows the primary database to continue serving the workload without interruption.
Restart SQL Apply on the upgraded logical standby database (2): Once the logical standby has been upgraded, SQL Apply must be restarted to apply the redo data from the primary database, which is still running the earlier version.
Perform a switchover to the logical standby database (4): After confirming that the logical standby database is successfully applying redo data, perform a switchover to make it the new primary database.
Upgrade the old primary database (6): With the new primary database now in place, upgrade the old primary database (which is now the new standby) to the new Oracle Database release.
Start SQL Apply on the old primary database (3): Finally, start SQL Apply on what is now the standby database to synchronize it with the new primary database.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database Upgrade Guide
質問 # 13
You detected an unrecoverable archive gap in your data guard environment. So, you need to roll standby.
forward in time without applying a large number of archive log files using this command:
RMAN> RECOVER STANDBY DATABASE FROM SERVICE-<primary database name>;
When running this command, which of the following steps can be performed automatically?
1. Remember all data file names on the standby.
2. Restart standby in nomount.
3. Restore controlfile from primary.
4. Mount standby database.
5. Rename data files from stored standby names.
6. Restore new data files to new names.
7. Recover standby.
- A. 1,2,3,4,5,6,7
- B. 1,3,5,6,7
- C. 1, 2,3,4,6,7
- D. 2,3,6,7
- E. 2,3,5,6,7
正解：C
解説：
The RECOVER STANDBY DATABASE FROM SERVICE command in RMAN is designed to automate various steps required to recover the standby database, especially when dealing with an archive gap. When this command is executed, the following actions can occur automatically:
* Remember all data file names on the standby (1): RMAN has the capability to recall the names and paths of all data files associated with the standby database.
* Restart standby in nomount (2): The standby database can be automatically restarted in the NOMOUNT state, allowing recovery operations to proceed without the database being open.
* Restore controlfile from primary (3): RMAN can restore the control file from the primary database to the standby system, ensuring that the standby has the most up-to-date control file.
* Mount standby database (4): After restoring the control file, the standby database is mounted to prepare for data file recovery.
* Rename data files from stored standby names (5): Not typically done automatically by this command.
* Restore new data files to new names (6): New data files added to the primary since the last synchronization can be restored to the standby with their correct names.
* Recover standby (7): Finally, RMAN will apply any necessary redo logs to bring the standby database up to date with the primary.
While some steps, such as renaming data files (5), typically require manual intervention or scripting, most of the recovery process can be handled by RMAN automatically, streamlining the recovery of the standby database.
References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Data Guard Concepts and Administration Guide
質問 # 14
You are monitoring your Data Guard broker configuration and issue this set of DGMGRL commands:
DGMGRL> SHOW CONFIGURATION;
Configuration - DRSolution
Protection Mode: MaxPerformance
Databases:
Close_by - Primary database
FS_inst - Far Sync
Far_away - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
What is true concerning this configuration?
- A. The FS_inst Far Sync instance forwards redo to the Far_away physical standby only if the Close_by primary database is not able to do so.
- B. The Far Sync instance will not forward redo to the Far_away physical standby because the Protection mode is not MaxProtection.
- C. The Close_by primary database instance forwards redo to the FS_inst Far Sync instance, which forwards the redo in turn to the Far_away physical standby database instance.
- D. The Far Sync instance will not forward redo to the Far_away physical standby because Fast-Start Failover is disabled.
- E. The Close_by primary database forwards redo to the Far_away physical standby directly and also sends redo to the FS_inst Far Sync instance.
正解：C
質問 # 15
Your Data Guard environment consists of these components and settings:
A primary database supporting an OLTP workload
A remote physical standby database
Real-time query is enabled
The redo transport mode is set to SYNC
The protection mode is set to Maximum Availability
Which two statements are true regarding the DelayMins database property for the standby database?
- A. It allows logical corruptions on the primary to be recovered by using the physical standby database.
- B. It enables you to bypass the default network timeout interval specified for the standby redo transport destination.
- C. It specifies a delay before the primary ships redo to the standby destination having DelayMins set.
- D. It allows user errors on the primary to be recovered by using the physical standby database.
- E. It can only be enabled for a configuration in Maximum Availability mode.
- F. It can only be enabled for a configuration in Maximum Performance mode.
正解：A、D
質問 # 16
Attempting to start the observer raises an error:
DGMGRL> start observer;
DGM-16954: Unable to open and lock the Observer configuration file
Failed.
Identify two possible ways to start the observer successfully.
- A. Start the observer using a different observer configuration file.
- B. Start the observer in a different working directory.
- C. Set the ObserverOverride property to TRUE before starting the observer.
- D. Enable Fast-Start Failover before starting the observer.
- E. Create a broker configuration and enable Fast-Start Failover before starting the observer.
正解：A、B
質問 # 17
You must design an Oracle Data Guard configuration for a DSS database that meets these permanent requirements:
1. Creating and maintaining bitmap indexes should not impact the performance of the primary database.
2. Creating and maintaining materialized views should not impact the performance of the primary database.
Additionally, there are these requirements, only one of which is ever done at any one time:
1. It should be possible to apply designated patches with a minimum amount of downtime.
2. Upgrading to a new database release should be performed with the least possible amount of downtime.
3. New application software releases should be tested against an exact and up-to-date replica of the primary database.
Which configuration meets these requirements with the fewest of databases?
- A. a primary database with one physical standby database
- B. A primary database with one logical and one physical standby database
- C. a primary database with two logical standby databases
- D. a primary database with two physical standby databases
- E. a primary database with one logical standby database
正解：E
解説：
* Logical standby databases allow the execution of DDL and DML operations, which makes them suitable for maintaining bitmap indexes and materialized views without affecting the performance of the primary database .
* Logical standby databases can be used for performing rolling upgrades and patching with minimum downtime, meeting another requirement .
* They also enable the testing of new application software releases against an up-to-date replica of the primary database, fulfilling the last requirement.
Other configurations involving physical standby databases or combinations of logical and physical standby databases might not meet all the specified requirements as efficiently or with the same level of performance isolation for the primary database.
質問 # 18
Which four statements are true regarding SQL Apply filters for a logical standby database?
- A. They can be used to skip ALTE1 STEM and ALTER DATABASE commands.
- B. They can be used to skip all SQL statements executed on a specific pluggable database (PDB) within a standby multitenant container database (CDB).
- C. They can be used to skip CREATE TABLE commands.
- D. They can only be used to skip DML statements on a table.
- E. They can be used to skip execution of DML triggers on a table while allowing the DML to execute.
- F. They can be used to skip ALTER TABLE commands on specific tables.
- G. They can be used to stop SQL apply if it encounters an error.
正解：A、C、E、F
解説：
Based on the Oracle Database 19c documentation, the correct answers about SQL Apply filters for a logical standby database are:A. They can be used to skip execution of DML triggers on a table while allowing the DML to execute.B. They can be used to skip CREATE TABLE commands.C. They can be used to skip ALTER SYSTEM and ALTER DATABASE commands.G. They can be used to skip ALTER TABLE commands on specific tables.
Comprehensive Detailed Explanation:SQL Apply filters in a logical standby database can be set to control which SQL operations are applied to the standby. These filters allow for certain commands to be skipped, ensuring that they do not impact the standby database. For example, filters can be used to skip the execution of DML triggers to prevent them from firing during SQL Apply, while still allowing the underlying DML to be executed on the logical standby database. This is particularly useful when certain triggers are not desired to run in a standby environment. CREATE TABLE, ALTER SYSTEM, ALTER DATABASE, and specific ALTER TABLE commands can also be skipped using SQL Apply filters to prevent unwanted structural changes or administrative operations from affecting the logical standby database. These capabilities provide a level of control to ensure that the logical standby database reflects only the desired state of the primary database.
References:Oracle Database SQL Language Reference and Oracle Data Guard Concepts and Administration guide offer comprehensive details on the use of SQL Apply filters, including the range of SQL statements that can be influenced by these filters in a logical standby database environment.
質問 # 19
Which THREE are true about using flashback database in a Data Guard environment?
- A. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
- B. It may not be used to flash back a primary database after a failover to a physical standby.
- C. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
- D. It may be used to flash back a physical standby that receives redo from a far sync instance.
- E. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- F. You can use it when real-time apply is enabled in case the phylt may not be used to flash back a primary database after a failover to a logical standby.
正解：A、B、D
解説：
Flashback Database is a feature that allows reverting a database to a previous point in time, which is extremely useful in various Data Guard configurations:
It may be used to flash back a physical standby that receives redo from a far sync instance (C): Flashback Database can be used on a physical standby database to revert it to a past point in time, even when it is receiving redo data from a far sync instance. This can be particularly useful to recover from logical corruptions or unwanted changes.
You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption (D): Even when real-time apply is enabled, which allows redo data to be applied to the standby database as soon as it is received, Flashback Database can be used to revert the physical standby database to a point in time before the logical corruption occurred.
It may not be used to flash back a primary database after a failover to a physical standby (E): After a failover has occurred from a primary to a physical standby database, making the standby the new primary, Flashback Database cannot be used to revert the old primary database to a state before the failover because the failover operation makes irreversible changes to the database role and configuration.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration
質問 # 20
Which TWO statements are true for Data Guard environments with multi-tenant databases?
- A. Different pluggable databases within a logical standby database may have different guard statuses.
- B. The CDBDBA privilege must be used instead of the SYSDBA privilege for connections as SYS to the root container of a multi-tenant standby database.
- C. The Data Guard broker automatically opens all pluggable databases of a primary database after a role change operation.
- D. The Data Guard broker automatically always opens the pluggable databases of a standby database after a role change operation.
- E. A multi-tenant standby database can have fewer pluggable databases than the primary container database.
正解：A、E
質問 # 21
A customer asks for your recommendation regarding this requirement:
1. We plan to have a Data Guard Configuration with one primary database and one physical standby database.
2. We want zero data loss in case of a disaster involving the loss of one component.
3. We want to do Real Application Testing occasionally on the Standby Database.
Which solution, if any, satisfies these requirements?
- A. These requirements cannot be met.
- B. A far sync instance plus a snapshot standby database and real time apply that can be converted regularly into logical standby database to do real application testing
- C. A snapshot standby database with real time query that can be converted regularly into a physical standby database open read write, to do real application testing
- D. A physical standby database with synchronous redo transport that can be converted regularly into a snapshot standby to do real application testing
正解：D
解説：
* Synchronous redo transport for zero data loss (B): To guarantee zero data loss in the case of a disaster, synchronous redo transport must be configured between the primary and standby databases.
* Conversion to snapshot standby for testing (B): A physical standby database can be temporarily converted into a snapshot standby database to perform real application testing. After testing is completed, the snapshot standby can be converted back to a physical standby to resume its disaster recovery role.
References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Database Testing Guide
質問 # 22
Which three Data Guard monitoring activities may be performed using Enterprise Manager Cloud Control?
- A. You can monitor the redo apply rate on a logical standby database.
- B. You can set a warning threshold on the redo generation rate metric for a physical standby database.
- C. You can check if redo apply needs to be tuned.
- D. You can set a critical threshold on the redo generation rate metric for a primary database.
- E. You can check the potential data loss in the event of a disaster.
- F. You can monitor the redo apply rate on a snapshot standby database.
正解：A、D、E
解説：
Enterprise Manager Cloud Control offers comprehensive monitoring capabilities for Oracle Data Guard environments. It enables monitoring the rate at which redo is being applied on a logical standby database (A), which is crucial for ensuring that the standby database is keeping up with the changes from the primary. It also allows setting thresholds on performance metrics, such as the redo generation rate on the primary database (B), to alert administrators when values exceed critical or warning thresholds. Additionally, it provides the capability to estimate the potential data loss in the event of a disaster (E), helping in disaster recovery planning and ensuring business continuity.
References:Oracle Enterprise Manager Cloud Control documentation provides extensive information on its monitoring features for Oracle Data Guard, including setting thresholds, estimating potential data loss, and tracking redo apply rates.
質問 # 23
Which THREE statements are true about snapshot standby databases?
- A. A snapshot standby database can be the only standby database in a Maximum Protection Oracle Data Guard configuration.
- B. A guaranteed restore point is created automatically when a physical standby database is converted into a snapshot standby database.
- C. A snapshot standby database must be opened at least once in read-write mode before it can be converted into a physical standby database.
- D. Snapshot standby databases may be used for rolling database upgrades.
- E. If datafiles grow while a database is a snapshot standby database, then they shrink when converted back to a physical standby database.
正解：B、C、D
質問 # 24
Your Data Guard configuration consists of these components and settings:
1. A primary database
2. A remote physical standby database
3. Real-time query is enabled
4. Redo transport mode is synchronous
5. Protection mode is maximum availability
6. The Data Guard broker is used
You notice that the standby destination fails to acknowledge reception of redo within net_timeout period of time.
Which is true in this scenario?
- A. Synchronous redo transport mode connections to the standby database are terminated.
- B. The physical standby database instance is shut down by the Data Guard broker.
- C. Real-time query will be disabled on the physical standby.
- D. The protection mode will automatically change to Maximum Performance.
正解：A
解説：
In a Data Guard configuration where the protection mode is set to Maximum Availability and synchronous redo transport is enabled, if the standby destination fails to acknowledge the reception of redo within the net_timeout period, the primary database will terminate the synchronous redo transport mode connections to the standby database to protect the primary database from hanging (C). The primary database then operates in a Maximum Performance mode until the issue is resolved. This behavior ensures that the primary database can continue to process transactions even when the standby database is temporarily unavailable.
References:The Oracle Data Guard Broker documentation and Oracle Data Guard Concepts and Administration guide detail the behavior of different protection modes and the response to network timeouts, including the fallback to asynchronous redo transport to maintain primary database availability.
質問 # 25
Your Data Guard environment has a remote physical standby database with real-time query enabled, which is used for reporting, and a logical standby database used for DSS reporting.
Switchovers or failovers are possible due to testing or in case of a disaster.
Clients use local TNSNAMES.ORA files to define connection strings to the database instances.
Which three will prevent clients from connecting to the wrong database instances?
- A. The standby database services must be defined statically with the Listeners running on the standby database hosts.
- B. The client applications must use the correct TNS entries when requesting connections to the database instances.
- C. Client TNS entries for the databases use the correct service names for the intended service.
- D. The DB_NAME and DB_UNIQUE_NAME parameters must be set to the same value for all the databases in the Data Guard environment.
- E. The LOCAL_LISTENER parameter on the primary database instance must always be set.
- F. Oracle Net connectivity to the primary database instance must be established on all the standby database instances.
- G. A service name is registered with the local listener of each database instance.
正解：A、B、C
解説：
Based on Oracle Database 19c: Data Guard Administration documents, the three measures that can prevent clients from connecting to the wrong database instances during switchovers, failovers, or regular operations in a Data Guard environment are:
B . The standby database services must be defined statically with the Listeners running on the standby database hosts.
D . The client applications must use the correct TNS entries when requesting connections to the database instances.
E . Client TNS entries for the databases use the correct service names for the intended service.
In an Oracle Data Guard configuration, correctly configuring Oracle Net Services (including TNS entries and listeners) is crucial for ensuring that clients connect to the appropriate database instance, whether it's the primary or standby. Defining services on the standby database and associating them with listeners ensures that client applications can connect to the standby when needed, especially useful in a role transition or when the standby is open for read-only access or real-time query. It's essential that TNS entries used by client applications specify the correct service names that correspond to the intended database roles, such as primary or standby. This setup facilitates seamless connectivity to the appropriate instance based on the role, especially critical during switchovers and failovers when the roles of the databases change.
Reference:
Oracle's Data Guard concepts and administration guide provides extensive information on configuring network services for Data Guard environments, ensuring that applications connect to the correct database instance based on the current role of the databases in the Data Guard configuration.
質問 # 26
In Oracle Database 19c, you can set the value of database initialization parameters in a database using the EDIT DATABASE... SET PARAMETER Command:
DGMGRL> EDIT DATABASE 'boston' SET PARAMETER log_archive_trace - 1;
Which THREE statements are TRUE about the command?
- A. The database must be available when the above command is run.
- B. The edit database parameter command can only be used to modify the value of a dynamic parameter in a database.
- C. The value set using this command is directly applied to the boston database.
- D. The EDIT DATABASE PARAMETER command can be used to set the value of a static parameter in a database.
- E. The value set using this command is directly stored in the broker configuration file.
正解：A、B、C
解説：
The EDIT DATABASE...SET PARAMETER command in Data Guard Management (DGMGRL) is used to modify the value of initialization parameters for a database within a Data Guard configuration. This command can be used to modify both static and dynamic parameters, but if a static parameter is changed, the new value will take effect only after the database is restarted. The database must be up and running for the command to execute, and the values set using the command are directly applied to the specified database (in this case, 'boston') .
質問 # 27
Which TWO statements are true about configuring Oracle Net Service in a Data Guard environment?
- A. Install the oracle-database-preinstall-19c package to set the kernel parameters for Oracle Net based on the Data Guard best practice guidelines.
- B. Installing the oracle-database-preinstall-19c package is NOT sufficient to set up operating system kernel parameters for Oracle Net.
- C. It is necessary to use the failover clause for an address_list with multiple address lists in the tnsnames.ora file.
- D. Enterprise Manager does not require static service registration to restart instances during the course of broker operations.
- E. A static service must be registered with the local listener to enable DGMGRL to restart instances during the course of broker operations.
正解：B、E
解説：
A static service must be registered with the local listener to enable DGMGRL to restart instances during the course of broker operations (A): For DGMGRL (Data Guard Manager Command-Line Interface) to perform instance management operations, such as restarting instances, a static service registration in the listener is required. This allows the broker to connect to the database instance even when the instance is not fully up and the dynamic service registration is not available.
Installing the oracle-database-preinstall-19c package is NOT sufficient to set up operating system kernel parameters for Oracle Net (C): While the oracle-database-preinstall-19c package automates the setting of several kernel parameters to meet the preinstallation requirements for Oracle Database, it does not specifically tailor all settings for Oracle Net in a Data Guard configuration. Additional manual configuration may be required to optimize Oracle Net services for Data Guard operations.
Reference:
Oracle Data Guard Broker documentation
Oracle Net Services Administrator's Guide
質問 # 28
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