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Oracle Database 19c: Data Guard Administration Sample Questions (Q58-Q63):

NEW QUESTION # 58
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. The DB_NAME and DB_UNIQUE_NAME parameters must be set to the same value for all the databases in the Data Guard environment.
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. Oracle Net connectivity to the primary database instance must be established on all the standby database instances.
G. A service name is registered with the local listener of each database instance.

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.
Reference:
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 # 59
Which three statements are true about snapshot standby databases?

A. A logical standby database can be converted into a snapshot standby database.
B. Tables can be dropped.
C. The FATLOVER TO command results in a transition of a snapshot standby database to the primary role.
D. Tablespaces can be created.
E. The switchover TO command allows a switchover operation to a snapshot standby database.
F. Tablespaces can be dropped.

Answer: B,D,F

Explanation:
A snapshot standby database is a fully updateable standby database that is created by converting a physical standby database into a snapshot standby database. The main characteristics of a snapshot standby database include:
* B: Tablespaces can indeed be dropped in a snapshot standby database because it is updateable and allows all types of DML and DDL operations that do not conflict with the standby role.
* C: Tablespaces can be created in a snapshot standby database for the same reasons that they can be
* dropped; it supports all operations that do not interfere with its standby nature.
* E: Tables can be dropped in a snapshot standby database, as it is a fully updateable standby.
Options A and D are incorrect because 'FAILOVER TO' and 'SWITCHOVER TO' commands are not used with snapshot standby databases in these contexts. A failover converts a standby database into the primary role after the original primary has become unavailable, and is not a reversible role transition. Switchover is a planned role reversal between the primary database and one of its standby databases and is not applicable to snapshot standby databases in the context provided.
Option F is incorrect because a logical standby database cannot be converted into a snapshot standby database directly. A logical standby is used for different purposes such as reporting and querying with real-time data, and its structure is different from a physical standby which can be converted into a snapshot standby.
References: Oracle Data Guard Concepts and Administration guide details the operations allowed on snapshot standby databases and the processes for transitioning between physical, snapshot, and logical standby databases.

NEW QUESTION # 60
You created a physical standby database prodsbyi from the primary database prod using SQL and RMAN. Which THREE are prerequisites for creating a Data Guard Broker configuration to manage these databases?

A. A local net service name to enable connectivity to the PRODSBYI database instance must be defined on the primary database host.
B. The LOG_ARCHIVE_DEST_n parameters with the service attribute set must be cleared.
C. The primary database must have FORCE LOGGING enabled.
D. The standby database must have supplemental logging enabled.
E. The DG_BROKER_START parameter must be set to TRUE for both database instances.
F. The primary database must have supplemental logging enabled.

Answer: A,E,F

Explanation:
When setting up a Data Guard Broker configuration for a primary database and its physical standby, the following prerequisites must be met:
A: Oracle Net connectivity must be defined on both the primary and standby hosts to enable the respective database instances to communicate with each other.
B: Supplemental logging is required on the primary database because it provides additional logging necessary for the standby database to be able to apply changes from the primary database accurately.
F: The DG_BROKER_START parameter must be set to TRUE for both the primary and standby database instances. This parameter is used to start the Data Guard Broker process which manages the configuration.
Options C and D are not prerequisites for creating a Data Guard Broker configuration. Additionally, while FORCE LOGGING mode (option E) is recommended as a best practice to prevent possible data inconsistencies during media recovery, it is not a strict prerequisite for creating a Data Guard Broker configuration.

NEW QUESTION # 61
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 the buffer cache on the physical standby database instances.
E. Increase the size of standby redo log files on the standby databases.

Answer: A,E

Explanation:
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 .

NEW QUESTION # 62
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 the primary database can be automatically recovered, using a block from a standby database with Real-Time Query enabled.
B. 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.
C. A corrupt block on a standby database with Real-Time Query enabled, can be automatically recovered, using a block from the primary database.
D. A corrupt block on a standby database with Real-Time Query enabled, is automatically recovered, using flashback logs from the standby database.
E. A corrupt block on the primary database is automatically recovered, using a block from a flashback log from the primary database.

Answer: A,E

Explanation:
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

NEW QUESTION # 63
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