[2026年04月02日] 合格率取得する秘訣は1z0-076認定試験エンジンPDF
1z0-076試験問題集合格できるには更新された2026年04月テスト問題集
Oracle 1z0-076 認定試験の出題範囲：
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質問 # 17
You must configure flashback database for your Oracle 19c databases that will be part of a Data Guard Broker configuration.
The databases are all in ARCHIVELOG mode.
You will execute the SQL statement:
ALTER DATABASE FLASHBACK ON;
Which three are true concerning this command?
- A. If executed successfully on an Oracle 19c primary database, flashback will also be enabled on all physical standby databases that are part of the configuration.
- B. If executed successfully on an Oracle 19c primary database, flashback will also be enabled on all logical standby databases that are part of the configuration.
- C. It will execute successfully on an Oracle 19c logical standby database while SQL apply is active.
- D. It will execute successfully on an Oracle 19c physical standby database while Real Time Query is active.
- E. It will execute successfully while an Oracle 19c primary database is mounted.
- F. It will execute successfully while an Oracle 19c primary database is open.
正解：C、E、F
解説：
The command ALTER DATABASE FLASHBACK ON; enables the Flashback Database feature, which provides a way to quickly revert an entire Oracle database back to a previous point in time. This command can be executed while an Oracle 19c primary database is either open (option A) or mounted (option B). It is also applicable to an Oracle 19c logical standby database while SQL Apply is active (option E). However, it's important to note that enabling Flashback Database on the primary does not automatically enable it on all associated standby databases, whether they are physical or logical. Each database in a Data Guard configuration must have Flashback Database explicitly enabled if desired. Real Time Query being active on a physical standby does not directly relate to the ability to execute this command on the standby. References:
The explanation is based on Oracle's concepts for Flashback Technology and Data Guard configurations as detailed in the Oracle Database Backup and Recovery User's Guide and the Oracle Data Guard Concepts and Administration guide.
質問 # 18
Which three statements are true about Data Guard database modes and states?
- A. Databases in a Data Guard Configuration need not operate in Flashback Logging mode.
- B. Force Logging Mode is not required for a primary database but is recommended.
- C. A primary database may ship redo directly to more than nine standby databases.
- D. The Primary Database can operate in noarchivelog mode.
- E. A Logical Standby Database can be in MOUNT state while applying changes.
正解：A、B、E
質問 # 19
Which three statements are true....... With no Oracle Streams or Goldengate configured?
- A. They are required on a physical standby for real-time apply.
- B. The LGWR process writes to them on ....
- C. They are required only for synchronous redo transport
- D. Only standby databases can write redo....
- E. They are required on a logical standby for real-time apply
- F. It is recommended to have them on the...
正解：A、B、E
解説：
C . The LGWR (Log Writer) process is responsible for writing redo entries from the redo log buffer to the online redo log files on the primary database. This is a fundamental process in the Oracle Database architecture, ensuring that all changes made to the database are captured for purposes such as recovery, replication, and high availability.
D . Real-time apply on a logical standby database requires standby redo log files. The standby redo log files are used to store redo data received from the primary database before it is applied to the logical standby database. This enables the logical standby to apply changes as they are received, without waiting for the current redo log file to be archived.
E . Similarly, on a physical standby database, standby redo log files are used for real-time apply. They store redo data from the primary database, allowing the physical standby to apply redo data concurrently as it is received, rather than waiting for redo log files to be archived. This capability is crucial for maintaining a physical standby database that is closely synchronized with the primary database with minimal lag.
These functionalities are integral to Oracle Data Guard configurations and are not dependent on Oracle Streams or Oracle GoldenGate, which are separate technologies for data replication and integration.
質問 # 20
Which two are true about database roles in an Oracle Data Guard configuration?
- A. A Snapshot Standby Database can be a fast-start failover target.
- B. A Physical Standby Database can be converted into a Logical Standby Database.
- C. A configuration consisting only of a primary and one or more physical standby databases can support a rolling release upgrade.
- D. A Logical Standby Database can be converted to a Snapshot Standby Database.
- E. A Logical Standby Database can cascade redo to a terminal destination.
正解：B、C
解説：
A Physical Standby Database can indeed be converted into a Logical Standby Database, providing flexibility in a Data Guard configuration. This allows for the database to switch roles and supports SQL apply operations, enabling more granular control over the data and transactions being replicated and applied. Additionally, having a configuration with a primary database and one or more physical standby databases allows for rolling upgrades to be performed. This means that each database in the Data Guard configuration can be upgraded in a phased manner, minimizing downtime and ensuring high availability during the upgrade process.
質問 # 21
Which THREE statements are true about Far Sync instances?
- A. They use an spfMe, a standby controlfile, and standby redo logs.
- B. They work with any protection level.
- C. The Data Guard Broker must be used to deploy and manage Far Sync instances.
- D. A primary database can ship redo directly to multiple Far Sync instances.
- E. They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary.
正解：C、D、E
質問 # 22
Which TWO statements are true about Real-Time Query?
- A. Real-Time Query has no limitations regarding the protection level of the Data Guard environment.
- B. Setting standby_max_data_delay=0 requires synchronous redo transport.
- C. Disabling Real-Time Query prevents the automatic start of redo apply when a physical standby databases opened read only.
- D. A standby database enabled for Real-Time Query cannot be the Fast-Start Failover target of the Data Guard configuration.
- E. Real-Time Query sessions can be connected to a Far Sync instance.
正解：B、C
解説：
Real-Time Query is a feature that allows queries to be run on a physical standby database while it is applying redo data. The relevant truths about it are:
Setting standby_max_data_delay=0 requires synchronous redo transport (A): For the real-time apply feature to function with no data delay (zero delay), synchronous redo transport must be used. This setting ensures that the data on the standby database is as current as possible before queries are executed against it.
Disabling Real-Time Query prevents the automatic start of redo apply when a physical standby database is opened read-only (C): If Real-Time Query is disabled, opening the standby database in read-only mode will not start the redo apply process automatically. Redo apply needs to be manually started to synchronize the standby database with the primary.
Reference:
Oracle Data Guard Concepts and Administration Guide
質問 # 23
You are licensed to use Oracle Active Data Guard.
Which TWO statements are true after enabling block change tracking on a physical standby database?
- A. It allows fast incremental backups to be offloaded to the physical standby database.
- B. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
- C. It starts the CTWR process on the primary database instance.
- D. It starts the CTWR process on the physical standby database instance.
- E. It allows fast incremental backups to be taken on the primary database.
- F. It starts the RVWR process on the physical standby database instance.
正解：A、F
解説：
Block change tracking is a feature that enhances the efficiency of incremental backups by recording changed blocks in a tracking file. When used with Oracle Active Data Guard:
It starts the RVWR process on the physical standby database instance (A): When block change tracking is enabled on a physical standby database, the Recovery Writer (RVWR) process is initiated. This process is responsible for recording the changes to blocks in the block change tracking file, which is then used to optimize incremental backups.
It allows fast incremental backups to be offloaded to the physical standby database (E): With block change tracking enabled on the physical standby database, fast incremental backups can be offloaded from the primary database. This reduces the workload on the primary database and utilizes the standby database for backup operations, improving overall system performance and efficiency.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Active Data Guard documentation
質問 # 24
You must configure an Oracle Data..........
1. A primary database
2. A physical standby database
Examine these requirements: 1. Data loss is not permitted.
1. Data loss is not permitted.
2. It should be possible to convert the physical standby database to a snapshot standby database.
3. Under normal operations, transactions should commit when redo is written to disk on the primary database and as soon as it has been received by the standby database instance.
4. The availability of the primary database should not be compromised by the availability of the standby database.
5. It should be possible to convert the physical standby database to a logical standby database
6. It should be possible to deploy Real Application Clusters on the primary database.
7. It should be possible to deploy Real Application Clusters on the physical standby database.
You configure SYNC redo transport mode in combination with Maximum Protection mode.
- A. 1, 2, 3, 4, 5, 6, and 7
- B. 1, 2, and 5
- C. 1, 6, and 7
- D. 1, 2, 3, 6, and 7
- E. 1, 2, 6, and 7
正解：A
解説：
When SYNC redo transport mode is combined with Maximum Protection mode, it ensures that no data loss will occur (requirement 1). The physical standby can be converted to a snapshot standby (requirement 2) and later to a logical standby database (requirement 5), satisfying both transformation requirements. Transactions commit as soon as redo data is received by the standby database (requirement 3). The availability of the primary is not dependent on the standby database in Maximum Protection mode, as the primary database will halt if the standby cannot acknowledge the redo (requirement 4), thus indirectly ensuring its availability. It is also possible to deploy Real Application Clusters on both the primary (requirement 6) and the physical standby database (requirement 7), providing high availability and scalability.
ReferencesOracle Data Guard documentation detailing the requirements for different database roles, protection modes, and redo transport modes, as well as the capabilities and limitations of each configuration.
質問 # 25
Which three are prerequisites for using Data Guard Broker?
- A. A statically defined listener end-point must be registered with the local listener on the servers hosting the standby database instances.
- B. The broker configuration files for a RAC database must reside in shared storage accessible by all the RAC database instances.
- C. Network connectivity to the primary database instance must be defined on the servers hosting the standby database instances.
- D. If any database in the configuration is a RAC database, then the broker configuration files must reside in shared storage accessible by all database instances for all databases in the broker configuration.
- E. The primary and standby databases must run the same version of the Oracle Database server.
- F. DG_BROKEB_START must be set to TRUE for a database instance before adding the database to the broker configuration.
正解：C、D、E
解説：
Data Guard Broker is a management tool that simplifies the configuration, management, and monitoring of Data Guard environments. The prerequisites for using Data Guard Broker include:
The primary and standby databases must run the same version of the Oracle Database server (A): This ensures compatibility between the primary and standby databases and enables seamless role transitions and data synchronization.
Network connectivity to the primary database instance must be defined on the servers hosting the standby database instances (B): Proper network connectivity is essential for communication between the primary and standby databases, allowing for the replication of data and the synchronization of changes.
If any database in the configuration is a RAC database, then the broker configuration files must reside in shared storage accessible by all database instances for all databases in the broker configuration (D): In Real Application Clusters (RAC) environments, shared storage ensures that all instances of the RAC database can access the broker configuration files, facilitating the management of the Data Guard environment across all instances.
Reference:
Oracle Data Guard Broker documentation
Oracle Real Application Clusters Administration and Deployment Guide
質問 # 26
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. 2,3,5,6,7
- B. 1,3,5,6,7
- C. 1, 2,3,4,6,7
- D. 2,3,6,7
- E. 1,2,3,4,5,6,7
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.
Reference:
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration Guide
質問 # 27
Which four requirements can be met by deploying a logical standby database?
- A. It must provide a disaster-recovery solution that protects all data with capability of performing switchovers and failovers.
- B. It must have the same physical structure as the primary database.
- C. Support for workloads requiring additional materialized views.
- D. It can be used for Real Application Testing without affecting the disaster recovery capabilities.
- E. Support for workloads requiring additional indexes.
- F. It can be used to create additional tables.
- G. It can be used to create additional schemas.
正解：C、D、E、F
解説：
A logical standby database is part of Oracle Data Guard and allows the standby database to be open for read-write operations, providing additional flexibility. The requirements met by a logical standby database include:
* Support for workloads requiring additional materialized views (A): Logical standby databases can support materialized views, allowing for complex data summarization and reporting workloads.
* It can be used to create additional tables (C): Unlike physical standby databases, logical standby databases allow for the creation of additional tables that do not exist in the primary database, enabling custom workloads and reporting.
* It can be used for Real Application Testing without affecting the disaster recovery capabilities (E):
Logical standby databases can be used to test application changes, patches, and upgrades while still maintaining their role as part of the disaster recovery strategy.
* Support for workloads requiring additional indexes (F): Logical standby databases allow for the creation of additional indexes to optimize query performance for reporting and analytical workloads.
References:
* Oracle Data Guard Concepts and Administration
* Oracle Database High Availability Overview
質問 # 28
Which TWO statements are true about database parameters for databases in a Data Guard environment?
- A. The databases that are part of a Data Guard configuration must have different DB_UNIQUE_NAME initialization parameters.
- B. If DB_RECOVERY_FILE_DEST is specified, then LOG_ARCHIVE_DEST_n is not required for local archive logs.
- C. LOG_FILE_NAME_CONVERT applies to online redo logs and archived logs.
- D. DB_FILE_NAME_CONVERT is only required if the standby database is on the same host as the primary database.
- E. COMPATIBLE must have identical values for primary and standby databases.
正解：A、E
質問 # 29
Which two statements are true regarding Data Guard environments in an Oracle Muti-tenant architecture?
- A. The Data Guard broker may be used for multi-tenant databases.
- B. PDB_FILE_NAME CONVERT must be set to enable creation of standby databases if they are created on the same host as the primary.
- C. Different redo transport methods can be configured for different pluggable databases within one Data Guard environment.
- D. Standby redo log files are required for each pluggable database that is protected with Data Guard.
- E. A Data Guard environment with a multi-tenant primary database can operate in any Protection mode.
正解：A、E
解説：
Oracle Multi-tenant architecture and Data Guard have several interactions, but specific aspects hold true in such environments:
* The Data Guard broker may be used for multi-tenant databases (B): Data Guard Broker simplifies the management and monitoring of Data Guard configurations and is fully compatible with the Oracle Multi-tenant architecture, allowing for easy management of Data Guard configurations that include multi-tenant container databases (CDBs) and their pluggable databases (PDBs).
* A Data Guard environment with a multi-tenant primary database can operate in any Protection mode (E): Data Guard can be configured to operate in Maximum Performance, Maximum Availability, or Maximum Protection mode, regardless of whether the primary database is a multi-tenant database.
This flexibility ensures that Data Guard can meet various data protection and availability requirements in multi-tenant environments.References:
* Oracle Data Guard Broker documentation
* Oracle Multitenant Administrator's Guide
質問 # 30
Your Data Guard environment has two remote physical standby databases.
Client applications use the local naming method to connect to the primary database instance.
You want applications to automatically connect to the new primary database instance in case of a switchover or a failover.
Which set of actions will fulfill this requirement?
- A. Create a database service on the primary database that is started automatically by a trigger, when the database role is PRIMARY; modify the connection descriptors used by client applications to include all the standby hosts and connect to the database instance using that service name.
- B. Set the LOCAL_LISTENER parameter for all the database instance to register services with the default listener on the primary database host.
- C. Set DB_NAME and DB_UNIQUE_NAME identically on all databases; modify the connection descriptors on client applications to include all the standby hosts and connect to the database instance using that service name.
- D. Set the INSTANCE NAME parameter identically on all databases; modify the connection descriptor on client applications to include all the standby hosts and connect to the database instance using that service name.
正解：A
解説：
For seamless client redirection in a Data Guard environment, the following steps should be taken:
* Create a database service on the primary database that is started automatically by a trigger when the database role is PRIMARY (B): This ensures that the service is only available on the primary database and is automatically started after a role transition due to switchover or failover.
* Modify the connection descriptors used by client applications to include all the standby hosts and connect to the database instance using that service name (B): Client applications use the connection descriptors that include all potential primary hosts (i.e., the current primary and all standbys). This enables clients to connect to whichever database is currently acting as the primary using the service name.References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Real Application Clusters Administration and Deployment Guide
質問 # 31
Examine the fast-start failover configuration:
- A. You must disable fast-start failover first to change the fast-start failover target to East sales.
- B. A failover may occur if the observer has lost connectivity to the primary database, even if the Fast-Start Failover target standby database has a good connection to the primary database
- C. The observer is running.
- D. The observer will initiate a failover when the primary database is unable to produce local archived redo log files.
- E. If South_Sales develops a problem and cannot be the target of a failover, the broker automatically changes the fast-start failover target to one of the other candidate targets.
正解：B、C、D
質問 # 32
Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?
- A. communicating with dkon processes in other database instances that are part of the broker configuration
- B. activating role-based services appropriately in the various database instances of the configuration, based on the database role
- C. maintaining information about all members of the broker configuration in binary configuration files.
- D. performing role transitions when switchover requests are made
- E. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required
正解：B、C、D
解説：
The Data Guard Monitor (DMON) process is a key component of Oracle Data Guard. It plays a crucial role in managing and monitoring the state of both the primary and standby databases in a Data Guard configuration.
* Performing role transitions when switchover requests are made (A): DMON is responsible for coordinating the switchover process between the primary and standby databases. This involves safely transitioning the roles of the databases to ensure data protection and availability.
* Maintaining information about all members of the broker configuration in binary configuration files (B): DMON maintains detailed information about the databases in the Data Guard configuration, including their roles, states, and network addresses. This information is stored in binary configuration files, which are used by the Data Guard Broker to manage the Data Guard environment.
* Activating role-based services appropriately in the various database instances of the configuration, based on the database role (C): DMON activates services that are appropriate for the role of each database in the Data Guard configuration. For example, it may activate different services on a primary database than on a standby database, based on the specific requirements of each role.
References:
* Oracle Data Guard Concepts and Administration
* Oracle Data Guard Broker documentation
質問 # 33
Examine the Data Guard configuration:
Which three will be true after a successful failover to Cats?
- A. Sheep will be in the disabled state.
- B. The configuration will be in Maximum Availability mode.
- C. Dogs will be in the disabled state and has to be manually reinstated.
- D. Sheep will be in the enabled state.
- E. The configuration will be in Maximum Performance mode.
正解：B、C、D
解説：
After a successful failover to the 'cats' database in a Data Guard configuration:
* B: Sheep, being another standby database, would typically remain in the enabled state unless specifically disabled or if there was a configuration issue.
* D: Dogs, which was the primary database prior to failover, will be in a disabled state as part of the failover process. Manual intervention is required to re-establish 'dogs' as a standby database or to return it to the primary role through another role transition.
* E: If the configuration was in Maximum Availability mode before failover, it would remain in this mode after failover, provided all settings were properly configured and no changes were made to the protection mode.
Option A is incorrect because failover does not automatically change the protection mode to Maximum Performance. The protection mode remains as it was prior to the failover unless manually altered.
References: The behavior of Oracle Data Guard during failover and the resulting configuration state is described in the Oracle Data Guard Broker documentation.
質問 # 34
Examine this validate command:
DGMGRL> VALIDATE DATABASE VERBOSE "<database name>";
Which THREE statements are TRUE?
- A. The command performs a comprehensive set of database checks prior to a role change.
- B. The command performs network connectivity checks between members of a broker configuration.
- C. The command can be used for a logical standby database.
- D. The command performs a comparison of SPFILE entries between the primary database and a specified standby database.
- E. The command uses information available in various Oracle Data Guard views as well as the Automatic Diagnostic Repository.
正解：A、B、C
解説：
* The command performs a comprehensive set of database checks prior to a role change (A): The VALIDATE DATABASE command in Data Guard Manager (DGMGRL) is designed to perform an exhaustive check of a specified database's readiness for a role change, such as a switchover or failover.
* The command performs network connectivity checks between members of a broker configuration (C): One of the checks includes verifying that the necessary network connectivity exists between the databases in a Data Guard Broker configuration.
* The command can be used for a logical standby database (D): The VALIDATE DATABASE command is versatile and can be used for both physical and logical standby databases to ensure their readiness for role changes.
References:
* Oracle Data Guard Broker documentation
* Oracle Data Guard Concepts and Administration Guide
質問 # 35
Which three are prerequisites for enabling Fast-Start Failover?
- A. The maximum protection mode can be used, but with two or more standby databases.
- B. The configuration must be operating in either Maximum Performance or Maximum Protection mode.
- C. You can specify only one standby database as the fast-start failover target.
- D. Flashback Database must be enabled only on the Fast-Start Failover target standby database.
- E. Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database.
- F. The Data Guard environment must be managed by the Data Guard Broker.
正解：C、E、F
解説：
To enable Fast-Start Failover in a Data Guard environment, the following conditions must be in place:
The Data Guard environment must be managed by the Data Guard Broker (A): The Broker simplifies management tasks and is required to enable fast-start failover, which is an automatic failover mechanism provided by Data Guard.
You can specify only one standby database as the fast-start failover target (C): Fast-start failover is designed to fail over to a single, predetermined standby database, known as the target standby.
Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database (F): Flashback Database provides a quick way to revert a database to a point in time before a logical or physical corruption or error occurred. It must be enabled on both the primary and target standby databases to allow for the possibility of reinstating the old primary as a standby after a failover.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database High Availability Overview
質問 # 36
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 phylt may not be used to flash back a primary database after a failover to a logical standby.
- B. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
- C. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
- D. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
- E. It may not be used to flash back a primary database after a failover to a physical standby.
- F. It may be used to flash back a physical standby that receives redo from a far sync instance.
正解：D、E、F
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 # 37
You are planning to perform block comparison using the dbms comp package:
Which TWO statements are true?
- A. It can be used to detect lost writes and inconsistencies between the primary database and the cascaded standbys.
- B. The databases should be at least mounted before block comparison.
- C. Logical standby databases can be the target database for the dbms_dbcomp.dbcomp procedure.
- D. You can monitor the progress of an ongoing block comparison operation by querying VS SES SION_LONGOPS.
- E. It requires that the DB_LOST_WKITE_protect initialization parameter be enabled.
正解：B、D
解説：
The DBMS_COMPARISON package, used for comparing and converging data objects within a single database or between databases, requires that the databases involved in the block comparison be at least mounted (A). This allows the procedure to access the data blocks for comparison. Additionally, the progress of long-running operations such as block comparison can be monitored using the dynamic performance view V$SESSION_LONGOPS (D), which provides information on the operation's progress and estimated completion time.
References:Oracle Database PL/SQL Packages and Types Reference provides comprehensive details on the DBMS_COMPARISON package, including its procedures and how to monitor their progress. Additionally, Oracle Database Reference explains the V$SESSION_LONGOPS view, which is commonly used for monitoring long operations in the database.
質問 # 38
Examine this query and its output:
Which two statements are true?
- A. The master observer is not connected to the database on which the query was executed.
- B. Cats is a bystander database.
- C. The master observer is currently running on ol7.example.com.
- D. The master observer is connected to the database on which the query was executed.
- E. The master observer is not running, but should run on ol7.example.com.
正解：A、B
解説：
D: The database role indicated by FS_FAILOVER_STATUS as BYSTANDER implies that the database is a standby database in the Data Guard configuration. This means the database is neither a primary database nor an active failover target.
E: Since the FS_FAILOVER_OBSERVER_HOST column shows cats, it suggests that this is the host on which the observer would run. However, because the FS_FAILOVER_OBSERVER_PRESENT column is not shown, we cannot definitively state if the observer is currently connected or not. If FS_FAILOVER_OBSERVER_PRESENT is 'YES', the observer is connected, if 'NO', then it's not. In the absence of this column's output, the best assumption based on the available data is that the observer is not connected.
The output shows that the FS_FAILOVER_STATUS is BYSTANDER, which indicates that the database in question is not actively involved in a fast-start failover configuration as a primary or standby. It is in a bystander role, meaning that while it is part of a Data Guard configuration, it is neither a target for failover nor actively participating in failover operations. Additionally, FS_FAILOVER_OBSERVER_HOST shows
'cats', which indicates the host where the observer process is expected to run. However, since there is no information about the observer being present, we can infer that although 'cats' is designated for the observer to run, the observer is not currently connected to this database.
ReferencesOracle documentation on Data Guard configurations and the V$DATABASE view which provides information about the fast-start failover status and observer host.
質問 # 39
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. Enable Fast-Start Failover before starting the observer.
- B. Create a broker configuration and enable Fast-Start Failover before starting the observer.
- C. Start the observer using a different observer configuration file.
- D. Set the ObserverOverride property to TRUE before starting the observer.
- E. Start the observer in a different working directory.
正解：C、E
質問 # 40
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