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無料でゲット！2026年最新の有効な練習Oracle Database 19c 1z1-076問題と解答でテストエンジン [Q26-Q50]

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無料でゲット！最新の2026年最新の有効な練習Oracle Database 19c 1z1-076問題と解答でテストエンジン

1z1-076問題集PDFで100%合格保証付き

質問 # 26
Which three Data Guard monitoring activities may be performed using Enterprise Manager Cloud Control?

  • A. You can set a warning threshold on the redo generation rate metric for a physical standby database.
  • B. You can monitor the redo apply rate on a snapshot standby database.
  • C. You can check if redo apply needs to be tuned.
  • D. You can check the potential data loss in the event of a disaster.
  • E. You can monitor the redo apply rate on a logical standby database.
  • F. You can set a critical threshold on the redo generation rate metric for a primary database.

正解：D、E、F

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.
Reference:
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 # 27
Which three statements are true about snapshot standby databases?

  • A. A resize command to extend the size of a datafile in the snapshot standby database, which was created in the snapshot standby database, will succeed.
  • B. A resize command to reduce the size of an empty datafile in the snapshot standby database, which was created in the primary database, will succeed.
  • C. A resize command to reduce the size of an empty datafile in the snapshot standby database, which was created in the snapshot standby database, will succeed.
  • D. A resize command to reduce the size of an empty datafile in the snapshot standby database, which was created in the physical standby database, will succeed.
  • E. A resize command to extend the size of a datafile in the snapshot standby database, which was created in the primary database, will succeed.

正解：A、C、E


質問 # 28
A customer has these requirements for their proposed Data Guard implementation:
1. Zero data loss must still be guaranteed through the loss of any one configuration component.
2. The primary database must be protected against a regional disaster.
3. Performance overheads on the primary should be minimized as much as possible given these requirements.
4. Downtime on the primary database for any reason must be kept to a minimum.
Components referred to in the broker commands are:

  • A.
  • B.
  • C.
  • D.

正解：A

解説：
According to the requirements stated:
Zero data loss must be guaranteed despite the loss of any one component: This necessitates synchronous redo transport to at least one standby database (for no data loss).
The primary database must be protected against a regional disaster: This implies that there must be a standby database in a different region.
Performance overhead on the primary should be minimized: This suggests that asynchronous transport should be used where possible to reduce the performance impact on the primary.
Downtime on the primary for any reason must be kept to a minimum: This is indicative of a requirement for a fast failover mechanism, possibly with a fast-start failover (FSFO) and high availability.
Given these requirements, the appropriate option that fulfills all these is:
Option C, where 'prima' is the primary database, 'fs1' is the Far Sync instance in the primary region, and 'physt' and 'physt2' are physical standby databases in the primary and remote regions, respectively. In this configuration:
'prima' is set to send redo to 'fs1' using SYNC to guarantee zero data loss.
'fs1' is set to send redo to 'physt' (local standby) using FASTSYNC, which is a low-latency synchronous transport that is optimized for performance.
The Data Guard configuration's protection mode is set to MAXAVAILABILITY to provide the highest level of data protection that is possible without compromising the availability of the primary database.
This configuration ensures that there is zero data loss even if the primary region is completely lost, maintains performance by limiting the synchronous transport to the local region with a Far Sync instance, and has a remote standby database in a separate region for disaster recovery purposes.
Reference:
Oracle Data Guard Concepts and Administration
Oracle Data Guard Broker documentation


質問 # 29
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 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
  • C. 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
  • 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.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database Testing Guide


質問 # 30
Which THREE statements are true about Far Sync instances?

  • A. A primary database can ship redo directly to multiple Far Sync instances.
  • B. They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary.
  • C. They use an spfMe, a standby controlfile, and standby redo logs.
  • D. They work with any protection level.
  • E. The Data Guard Broker must be used to deploy and manage Far Sync instances.

正解：A、B、E

解説：
Far Sync instances are a feature of Oracle Data Guard designed to support zero data loss protection over long distances:
* The Data Guard Broker must be used to deploy and manage Far Sync instances (A): Data Guard Broker simplifies the deployment and management of Far Sync instances, which are an integral part of zero data loss protection configurations.
* They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary (C): Far Sync instances are designed to receive redo from the primary database and then forward it to a remote standby database, thereby avoiding any performance
* impact on the primary database itself.
* A primary database can ship redo directly to multiple Far Sync instances (E): A primary database can be configured to send redo logs to more than one Far Sync instance, which can then forward the redo to their respective remote standby databases.References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Database High Availability Overview


質問 # 31
Suppose that you manage the following databases in your environment:
* boston: Primary database with a single PDB called DEVI
* london: Physical standby database protecting the PDB called DEVI
* orcl: Stand-alone database with a single PDB called PDB1 as a remote clone source You are planning to run the following command to create a remote clone in the primary database (boston) using pdbi in orcl:
Which are the THREE prerequisites for automating instantiation of the PDB in the standby database (london)?

  • A. Set standby_pdb_source_file_dblink to clone_link in the london database.
  • B. Set STANDBY_FILE_MANAGEMENT to auto in the london database.
  • C. Enable Active Data Guard in the _ondon database.
  • D. Open PDBI (remote clone source) in Read Write.
  • E. Open PDBI (remote clone source) in Read Only.
  • F. Set STANDBY_PDB_SOURCE_FILE_DIRECTORY to <location of the PDB> in the london database.

正解：B、E、F

解説：
To automate the instantiation of a PDB in the standby database after creating a remote clone in the primary database, certain conditions must be met:
* Open PDBI (remote clone source) in Read Only (A): The source PDB from which the clone is created must be open in read-only mode to ensure a consistent state during cloning.
* Set STANDBY_PDB_SOURCE_FILE_DIRECTORY to <location of the PDB> in the london database (C): This parameter specifies the location on the standby database where the files from the source PDB should be placed.
* Set STANDBY_FILE_MANAGEMENT to auto in the london database (F): This parameter automates the management of file changes on the standby database when structural changes occur on the primary database, ensuring that the clone operation is reflected automatically on the standby.
References:
* Oracle Multitenant Administrator's Guide
* Oracle Data Guard Broker documentation


質問 # 32
Which four statements are true regarding SQL Apply filters for a logical standby database?

  • A. They can be used to skip CREATE TABLE commands.
  • B. They can be used to skip ALTE1 STEM and ALTER DATABASE commands.
  • C. They can be used to skip all SQL statements executed on a specific pluggable database (PDB) within a standby multitenant container database (CDB).
  • D. They can be used to skip ALTER TABLE commands on specific tables.
  • E. They can be used to stop SQL apply if it encounters an error.
  • F. They can be used to skip execution of DML triggers on a table while allowing the DML to execute.
  • G. They can only be used to skip DML statements on a table.

正解：A、B、D、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.
Reference:
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 # 33
Which three can be done using Data Guard Broker?

  • A. Create a new physical standby database.
  • B. Automating failover to a specified target standby database.
  • C. Configuring the standby control file, server parameter file, and data files for a standby database.
  • D. Monitoring and managing redo transport services, and log apply services.
  • E. Define logical standby database skip rules.
  • F. Converting physical standby databases to snapshot standby databases.

正解：A、B、F


質問 # 34
You must configure on Oracle Data .......
1. A primary database
2. Three Physical Standby Databases
Examine these requirements:
A designated physical standby database should become the primary database automatically whenever the primary database fails.
2. The chosen protection mode should provide the highest level of protection possible without violating the other requirement.
Which redo transport mode and protection mode would you configure to meet these requirements?

  • A. SYNC and Maximum Protection
  • B. FASTSYNC and Maximum Protection
  • C. ASYNC and Maximum Performance
  • D. FASTSYNC and Maximum Availability

正解：D

解説：
To meet the requirements of automatic failover and the highest level of protection without data loss, the combination of FASTSYNC redo transport mode and Maximum Availability protection mode is appropriate.
FASTSYNC ensures that the performance impact on the primary database is minimized while still providing synchronous transport. Maximum Availability protection mode offers the highest level of data protection without compromising the availability of the primary database. In case of a network failure or a standby failure, the primary will not halt, avoiding disruption to the primary database operations.
ReferencesOracle Data Guard Concepts and Administration guide, which details the different protection modes and their respective levels of data protection and impact on database operations.


質問 # 35
Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?

  • A. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required
  • B. performing role transitions when switchover requests are made
  • C. activating role-based services appropriately in the various database instances of the configuration, based on the database role
  • D. maintaining information about all members of the broker configuration in binary configuration files.
  • E. communicating with dkon processes in other database instances that are part of the broker configuration

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.
Reference:
Oracle Data Guard Concepts and Administration
Oracle Data Guard Broker documentation


質問 # 36
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, 6, and 7
  • B. 1, 2, and 5
  • C. 1, 2, 6, and 7
  • D. 1, 2, 3, 4, 5, 6, and 7
  • E. 1, 2, 3, 6, and 7

正解：D

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 # 37
Examine the Data Guard configuration:
DGMGRL> show configuration;
Configuration - Animals
Protection Mode: Max Availability
Databases:
dogs - Primary database sheep
- Physical standby database cats
- Physical standby database
Fast-Start Failover: DISABLED
Configuration Status: SUCCESS
An attempt to enable fast-start failover raises an error:
DGMGRL> enable fast_start failover;
Error: ORA-16693: requirements not met for enabling fast-start failover Failed.
Identify three possible reasons for this error.

  • A. The fastStartFailoverTarget property is not set on Dogs.
  • B. The LogxptModr property is set to async on Sheep while Sheep is the target standby database.
  • C. The LogXptMode property is set to fastsync on Dogs.
  • D. The LogXptMode property is set to async on Dogs.
  • E. The LogXptMode property is set to FASTSYNC on Cats while Sheep is the target standby database.

正解：A、B、D

解説：
When enabling fast-start failover, certain conditions must be met:
* The fastStartFailoverTarget property is not set on Dogs (A): The primary database (Dogs) needs to have a fast-start failover target configured for the operation to succeed.
* The LogXptMode property is set to ASYNC on Sheep while Sheep is the target standby database (B): Fast-start failover requires synchronous redo transport (SYNC or FASTSYNC) to ensure zero data loss, which is a prerequisite for enabling the feature.
* The LogXptMode property is set to ASYNC on Dogs (D): Similar to the previous point, the primary database must be configured to use synchronous redo transport for the fast-start failover to be possible.
References:
* Oracle Data Guard Broker documentation
* Oracle Database Error Messages Guide


質問 # 38
You notice that the SQL apply lag on your logical standby database has increased but the redo transport lag has not.
Which four could be reasons for the increase in SQL apply lag?

  • A. An increased number of bulk inserts on the primary
  • B. Many SQL apply operations do full table scans
  • C. An undersized shared pool
  • D. An undersized undo tablespace on the logical standby
  • E. An increased number of bulk updates on the primary
  • F. The standby redo log files are undersized on the primary database

正解：B、C、D、E

解説：
The SQL apply lag on a logical standby database can be caused by several factors:
A: An undersized undo tablespace can lead to delays in SQL apply operations as it may not be able to handle the volume of undo records generated by the SQL apply process.
B: SQL apply operations that do full table scans can consume significant system resources, potentially leading to higher apply lag.
C: An increased number of bulk updates on the primary database may generate a large volume of redo data, which can cause apply lag if the logical standby cannot apply the changes quickly enough.
F: An undersized shared pool may affect the parsing and execution of SQL statements by SQL apply, which can contribute to the apply lag.
Option D is less likely to be a direct cause of SQL apply lag compared to bulk updates, as inserts generate new data rather than modifying existing data, which SQL apply can typically handle more efficiently.
Option E is incorrect because the size of the standby redo log files on the primary database impacts redo transport lag, not SQL apply lag.


質問 # 39
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 starts the CTWR process on the primary database instance.
  • B. It starts the RVWR process on the physical standby database instance.
  • C. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
  • D. It allows fast incremental backups to be offloaded to the physical standby database.
  • E. It allows fast incremental backups to be taken on the primary database.
  • F. It starts the CTWR process on the physical standby database instance.

正解：B、D

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.References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Active Data Guard documentation


質問 # 40
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 DB_NAME and DB_UNIQUE_NAME parameters must be set to the same value for all the databases in the Data Guard environment.
  • C. A service name is registered with the local listener of each database instance.
  • D. Client TNS entries for the databases use the correct service names for the intended service.
  • E. The client applications must use the correct TNS entries when requesting connections to the database instances.
  • F. The LOCAL_LISTENER parameter on the primary database instance must always be set.
  • G. Oracle Net connectivity to the primary database instance must be established on all the standby database instances.

正解：A、D、E

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.
* References: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 # 41
Examine the Data Guard configuration:

Which three will be true after a successful failover to Cats?

  • A. The configuration will be in Maximum Performance mode.
  • B. Sheep will be in the disabled state.
  • C. Sheep will be in the enabled state.
  • D. The configuration will be in Maximum Availability mode.
  • E. Dogs will be in the disabled state and has to be manually reinstated.

正解：C、D、E

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.


質問 # 42
Which three are true regarding prerequisites for a logical standby database as a disaster recovery solution?

  • A. Ensure that no ROWID data types are contained in the primary database.
  • B. Ensure that no BFILE LOB data types are contained in the primary database.
  • C. Ensure that supplemental logging is enabled on the primary database.
  • D. Do not perform any nologging operations on the primary.
  • E. Ensure that flashback is enabled on the primary database.

正解：B、C、D


質問 # 43
Active Data Guard (ADG) databases are widely used to offload reporting or ad hoc query-only jobs from the primary database. Reporting workload profile is different from the primary database and often requires tuning.
Which tool is used to tune SQL workloads running on an ADG database?

  • A. In-Memory Active Session History (ASH)
  • B. Automatic Workload Repository (AWR)
  • C. SQL Tuning Advisor
  • D. Standby Statspack
  • E. Automatic Diagnostic Database Monitor (ADDM)

正解：B

解説：
AWR collects, processes, and maintains performance statistics for problem detection and self-tuning purposes.
In an Active Data Guard environment, where the physical standby database can be used for read-only workloads, AWR can be instrumental in identifying performance bottlenecks and areas for optimization. It provides detailed reports that include wait events, time model statistics, and active session history, making it an invaluable tool for tuning SQL queries and overall database performance in an ADG setup.


質問 # 44
Which two statements are true regarding Data Guard environments in an Oracle Muti-tenant architecture?

  • A. A Data Guard environment with a multi-tenant primary database can operate in any Protection mode.
  • B. Different redo transport methods can be configured for different pluggable databases within one Data Guard environment.
  • C. Standby redo log files are required for each pluggable database that is protected with Data Guard.
  • D. PDB_FILE_NAME CONVERT must be set to enable creation of standby databases if they are created on the same host as the primary.
  • E. The Data Guard broker may be used for multi-tenant databases.

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.
Reference:
Oracle Data Guard Broker documentation
Oracle Multitenant Administrator's Guide


質問 # 45
Examine the Data Guard configuration:
DGMGRL> show configuration;
Configuration - Animals
Protection Mode: Max Availability
Databases:
dogs - Primary database sheep
- Physical standby database cats
- Physical standby database
Fast-Start Failover: DISABLED
Configuration Status: SUCCESS
An attempt to enable fast-start failover raises an error:
DGMGRL> enable fast_start failover;
Error: ORA-16693: requirements not met for enabling fast-start failover Failed.
Identify three possible reasons for this error.

  • A. The fastStartFailoverTarget property is not set on Dogs.
  • B. The LogxptModr property is set to async on Sheep while Sheep is the target standby database.
  • C. The LogXptMode property is set to fastsync on Dogs.
  • D. The LogXptMode property is set to async on Dogs.
  • E. The LogXptMode property is set to FASTSYNC on Cats while Sheep is the target standby database.

正解：A、B、D

解説：
When enabling fast-start failover, certain conditions must be met:
The fastStartFailoverTarget property is not set on Dogs (A): The primary database (Dogs) needs to have a fast-start failover target configured for the operation to succeed.
The LogXptMode property is set to ASYNC on Sheep while Sheep is the target standby database (B): Fast-start failover requires synchronous redo transport (SYNC or FASTSYNC) to ensure zero data loss, which is a prerequisite for enabling the feature.
The LogXptMode property is set to ASYNC on Dogs (D): Similar to the previous point, the primary database must be configured to use synchronous redo transport for the fast-start failover to be possible.
Reference:
Oracle Data Guard Broker documentation
Oracle Database Error Messages Guide


質問 # 46
Which TWO statements correctly describe the behavior of Automatic Block Media Recovery in a Data Guard environment, for a corrupt block in the example tablespace encountered by a session logged in as the SH user?

  • A. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
  • B. A corrupt block on a standby database with Real-Time Query enabled, can be automatically recovered, using a block from the primary database.
  • C. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from a standby database with Real-Time Query enabled.
  • D. A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled.
  • E. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database.

正解：D、E

解説：
Automatic Block Media Recovery can be a significant feature for maintaining data integrity within a Data Guard configuration.
* A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled (A): When a corrupted block is encountered on the primary database, Oracle can automatically replace it with a good block from the standby database where Real-Time Query is enabled, leveraging the standby as a source of good data.
* A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database (E): If a good block version is available in the flashback logs of the primary database, Automatic Block Media Recovery can use it to recover the corrupted block on the primary.References:
* Oracle Database Backup and Recovery User's Guide


質問 # 47
Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?

  • A. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required
  • B. performing role transitions when switchover requests are made
  • C. activating role-based services appropriately in the various database instances of the configuration, based on the database role
  • D. maintaining information about all members of the broker configuration in binary configuration files.
  • E. communicating with dkon processes in other database instances that are part of the broker configuration

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 # 48
Which TWO statements correctly describe the behavior of Automatic Block Media Recovery in a Data Guard environment, for a corrupt block in the example tablespace encountered by a session logged in as the SH user?

  • A. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
  • B. A corrupt block on a standby database with Real-Time Query enabled, can be automatically recovered, using a block from the primary database.
  • C. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from a standby database with Real-Time Query enabled.
  • D. A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled.
  • E. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database.

正解：D、E

解説：
Automatic Block Media Recovery can be a significant feature for maintaining data integrity within a Data Guard configuration.
A corrupt block on the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled (A): When a corrupted block is encountered on the primary database, Oracle can automatically replace it with a good block from the standby database where Real-Time Query is enabled, leveraging the standby as a source of good data.
A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database (E): If a good block version is available in the flashback logs of the primary database, Automatic Block Media Recovery can use it to recover the corrupted block on the primary.
Reference:
Oracle Database Backup and Recovery User's Guide


質問 # 49
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. It will execute successfully while an Oracle 19c primary database is mounted.
  • 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 physical standby database while Real Time Query is active.
  • D. 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.
  • E. It will execute successfully on an Oracle 19c logical standby database while SQL apply is active.
  • F. It will execute successfully while an Oracle 19c primary database is open.

正解：A、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. Reference: 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 # 50
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