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Oracle 1z1-076全真模擬試験: Oracle Database 19c: Data Guard Administration - MogiExamプロフェッショナルオファー
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Oracle Database 19c: Data Guard Administration 認定 1z1-076 試験問題 (Q105-Q110):
質問 # 105
Which THREE statements are TRUE about the supported workload in Active Data Guard standby databases?
- A. The DML operations on a standby can be transparently redirected to and run on the primary database
- B. The DDL operations on private temporary tables are transparently redirected to the primary database.
- C. Read-mostly reporting applications that use global temporary tables for storing temporary data can be offloaded.
- D. You might have to use sequences with global temporary tables to support read-mostly applications by using Active Data Guard.
- E. PL/SQL blocks that you run on Active Data Guard standby databases can be always redirected to and run on the primary database.
正解:A、C、D
解説:
In an Oracle Active Data Guard environment:
* B: Read-mostly reporting applications that utilize global temporary tables to store session-specific data can be effectively offloaded to an Active Data Guard standby database, reducing the load on the primary database.
* C: Sequences can be used with global temporary tables on an Active Data Guard standby database to support certain types of read-mostly applications, though some restrictions on sequence use may apply.
* E: In Oracle Database 19c and later, DML redirection allows DML operations performed on an Active Data Guard standby database to be transparently redirected to the primary database. This is part of the DML Redirection feature.
Option A is incorrect because not all PL/SQL blocks run on an Active Data Guard standby database can be redirected to the primary database. Some PL/SQL executions, specifically those that would attempt to make changes to the database, are not supported on the standby.
Option D is incorrect because DDL operations on private temporary tables are not redirected; instead, private temporary tables are session-specific and are not persisted on disk, so they do not generate redo and are not applicable to an Active Data Guard standby.
References: The behavior and capabilities of Active Data Guard standby databases are documented in the Oracle Data Guard Concepts and Administration guide and the Active Data Guard documentation.
質問 # 106
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. Sheep will be in the enabled state.
- C. Dogs will be in the disabled state and has to be manually reinstated.
- D. The configuration will be in Maximum Availability mode.
- 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.
質問 # 107
Your Data Guard environment consists of these components and settings:
1. A primary database
2. Two remote physical standby databases
3. The redo transport mode is set to sync
4. Real-time query is enabled for both standby databases
5. The DB_BLOCK_CHECKING parameter is set to TRUE on both standby databases You notice an increase in redo apply lag time on both standby databases.
Which two would you recommend to reduce the redo apply lag on the standby databases?
- A. Lower DB_BLOCK_CHECKING to MEDIUM or low on the standby databases.
- B. Decrease the redo log file size on the primary database.
- C. Increase the number of standby redo log files on the standby databases.
- D. Increase the size of standby redo log files on the standby databases.
- E. Increase the size of the buffer cache on the physical standby database instances.
正解:A、D
解説:
To reduce the redo apply lag on standby databases, one could increase the size of the standby redo log files. Larger redo log files can accommodate more redo data, which may reduce the frequency of log switches and allow for more continuous application of redo data. Additionally, lowering the DB_BLOCK_CHECKING parameter to MEDIUM or LOW on the standby databases can help improve redo apply performance. High block checking can impose additional CPU overhead during the application of redo data, potentially increasing apply lag times. By reducing the level of block checking, you can lessen this overhead and help reduce the apply lag .
質問 # 108
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. Real-time query will be disabled on the physical standby.
- C. The protection mode will automatically change to Maximum Performance.
- D. The physical standby database instance is shut down by the Data Guard broker.
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 # 109
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. Sheep will be in the enabled state.
- C. Dogs will be in the disabled state and has to be manually reinstated.
- D. The configuration will be in Maximum Availability mode.
- 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 # 110
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