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問題 #32
Examine the Data Guard configuration:

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

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

答案：A,D,E

解題說明：
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.

問題 #33
Which THREE statements are true about Far Sync instances?

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

答案：B,C,D

解題說明：
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.
Reference:
Oracle Data Guard Concepts and Administration Guide
Oracle Database High Availability Overview

問題 #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. ASYNC and Maximum Performance
C. FASTSYNC and Maximum Availability
D. FASTSYNC and Maximum Protection

答案：C

解題說明：
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.
Reference
Oracle Data Guard Concepts and Administration guide, which details the different protection modes and their respective levels of data protection and impact on database operations.

問題 #35
Examine the following parameter settings of the physical standby database:
* STANDBY_FILE_MANAGEMENT=AUTO
* ENABLED_PDBS_ON_STANDBY=<null>
During which TWO tasks are files automatically created in the physical standby database after structure changes on the primary database?

A. Adding or dropping a redo file group
B. Creating a PDB from the existing PDB within the same CDB
C. Adding a data file or creating a tablespace
D. Renaming a data file in the primary database
E. Performing transportable tablespaces

答案：B,C

解題說明：
When STANDBY_FILE_MANAGEMENT is set to AUTO, the Oracle Data Guard automatically creates, deletes, and renames files on the standby database to match the changes made on the primary database. The tasks that lead to the automatic creation of files on the standby include:
* Adding a data file or creating a tablespace (C): When a new tablespace is created or a new data file is added on the primary database, the standby database automatically replicates this action, maintaining structural consistency with the primary database.
* Creating a PDB from the existing PDB within the same CDB (D): Creating a new Pluggable Database (PDB) within a Multitenant Container Database (CDB) on the primary database triggers an automatic creation of the corresponding PDB within the standby CDB.References:
* Oracle Data Guard Concepts and Administration Guide

問題 #36
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. It is necessary to use the failover clause for an address_list with multiple address lists in the tnsnames.ora file.
C. Installing the oracle-database-preinstall-19c package is NOT sufficient to set up operating system kernel parameters for Oracle Net.
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.

答案：C,E

解題說明：
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

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