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Oracle Database 19c: Data Guard Administration Sample Questions (Q61-Q66):

NEW QUESTION # 61
Which TWO statements are true about configuring Oracle Net Service in a Data Guard environment?

A. A static service must be registered with the local listener to enable DGMGRL to restart instances during the course of broker operations.
B. Enterprise Manager does not require static service registration to restart instances during the course of broker operations.
C. Install the oracle-database-preinstall-19c package to set the kernel parameters for Oracle Net based on the Data Guard best practice guidelines.
D. Installing the oracle-database-preinstall-19c package is NOT sufficient to set up operating system kernel parameters for Oracle Net.
E. It is necessary to use the failover clause for an address_list with multiple address lists in the tnsnames.ora file.

Answer: A,D

Explanation:
* 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.
References:
* Oracle Data Guard Broker documentation
* Oracle Net Services Administrator's Guide

NEW QUESTION # 62
Which THREE are true about using flashback database in a Data Guard environment?

A. It may not be used to flash back a primary database after a failover to a physical standby.
B. When a flashback database operation is performed on a primary database, a physical standby database is also flashed back automatically.
C. 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.
D. When a flashback database operation is performed on a primary database, a logical standby database is also flashed back automatically.
E. You can use it when real-time apply is enabled in case the physical standby suffers from logical corruption.
F. It may be used to flash back a physical standby that receives redo from a far sync instance.

Answer: A,E,F

NEW QUESTION # 63
Which two are true about database roles in an Oracle Data Guard configuration?

A. A Logical Standby Database can be converted to a Snapshot Standby Database.
B. A Snapshot Standby Database can be a fast-start failover target.
C. A Physical Standby Database can be converted into a Logical Standby Database.
D. A configuration consisting only of a primary and one or more physical standby databases can support a rolling release upgrade.
E. A Logical Standby Database can cascade redo to a terminal destination.

Answer: C,D

Explanation:
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.

NEW QUESTION # 64
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. Client TNS entries for the databases use the correct service names for the intended service.
B. The LOCAL_LISTENER parameter on the primary database instance must always be set.
C. Oracle Net connectivity to the primary database instance must be established on all the standby database instances.
D. The client applications must use the correct TNS entries when requesting connections to the database instances.
E. The standby database services must be defined statically with the Listeners running on the standby database hosts.
F. A service name is registered with the local listener of each database instance.
G. The DB_NAME and DB_UNIQUE_NAME parameters must be set to the same value for all the databases in the Data Guard environment.

Answer: A,D,E

Explanation:
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.

NEW QUESTION # 65
Your Data Guard environment contains a primary database and three standby databases with these attributes:
1. prod : Primary database
2. prod_prq : Physical standby database with real-time query enabled used by reporting applications
3. prod_lsby: Logical standby database used by DSS
4. PROD_SSBY: Snapshot standby database used for Real Application Testing Which TWO can be used to prevent clients from connecting to the wrong database instance?

A. Create database services for each database and use event triggers to make sure that services are activated only when the database is in the correct role.
B. Create a static service for each of the databases, register it with the local listener of each database instance, and add connection descriptors on clients to connect to those services.
C. Establish Oracle Net connectivity to the primary database instance from all the standby database instances.
D. Create role based services with the si vet] utility when using clusterware for Oracle RAC databases or Oracle Restart for single instance Oracle databases.
E. Create database services on each of the standby databases, start the services, and add connection descriptors on the clients to connect to those services.

Answer: A,E

Explanation:
Creating dedicated database services for each database instance (Option D) and utilizing event triggers to manage these services based on the role of the database (Option E) ensure that clients connect to the appropriate database instance based on its current role and state. This approach leverages the flexibility and control provided by Oracle Net services and database event management to direct client connections to the suitable primary or standby instance, enhancing the overall robustness and reliability of the Data Guard environment. References: Based on Oracle Database 19c best practices for managing connectivity and services in a Data Guard setup, including the use of role-based services and event-driven service management.

NEW QUESTION # 66
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