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Oracle Database 19c: Data Guard Administration Sample Questions (Q34-Q39):

NEW QUESTION # 34
Which two are prerequisites for configuring flashback database for Oracle 19c databases, in a Data Guard environment?

* A. A far sync instance must be configured to flash back a standby when the primary has been flashed back.
* B. A fast recovery area must be configured.
* C. The database must be in ARCHTVELOG mode.
* D. The data guard broker must be used.
* E. The Data Guard real-time apply feature must be enabled.
Answer: B,C

Explanation:
* A fast recovery area must be configured (emoticon: Flashback Database requires a fast recovery area to be set up because flashback logs are stored there. The fast recovery area is a unified storage location for all recovery-related files and activities.
* The database must be in ARCHIVELOG mode (C): Flashback Database operation relies on the ability to archive redo logs. Therefore, the database must be running in ARCHIVELOG mode for Flashback Database to be enabled.
References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Data Guard Concepts and Administration Guide

NEW QUESTION # 35
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 LogXptMode property is set to FASTSYNC on Cats while Sheep is the target standby database.
* B. The LogXptMode property is set to fastsync on Dogs.
* C. The LogxptModr property is set to async on Sheep while Sheep is the target standby database.
* D. The fastStartFailoverTarget property is not set on Dogs.
* E. The LogXptMode property is set to async on Dogs.
Answer: C,D,E

Explanation:
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 (emoticon: 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

NEW QUESTION # 36
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 physical standby database instance.
* B. It starts the RVWR process on the physical standby database instance.
* C. It starts the CTWR process on the primary database instance.
* D. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.
* E. It allows fast incremental backups to be taken on the primary database.
* F. It allows fast incremental backups to be offloaded to the physical standby database.
Answer: B,F

Explanation:
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

NEW QUESTION # 37
Examine this list of possible steps:
1. Raise the compatibility level on both databases.
2. Restart SQL Apply on the upgraded logical standby database.
3. Start SQL Apply on the old primary database.
4. Perform a Switchover to the logical standby database.
5. Upgrade the logical standby database.
6. Upgrade the old primary database.
Which is the minimum number of steps in the correct order, to perform a rolling release upgrade of a data guard environment using an existing logical standby database and to enable the new functionality?

* A. 5,2,4,6,3,1
* B. 1,5,2,4,6,3
* C. 5,2,4,1
* D. 5,2,4,3,6,1
* E. 4,6,5,2,3,1
Answer: B

Explanation:
The process of performing a rolling release upgrade in a Data Guard environment using a logical standby database generally involves these steps:
* Raise the compatibility level on both databases (1): Ensuring both the primary and logical standby databases are operating with the same and correct compatibility level is essential before starting the upgrade process.
* Upgrade the logical standby database (5): Apply the database upgrade to the logical standby first, which allows the primary database to continue serving the workload without interruption.
* Restart SQL Apply on the upgraded logical standby database (2): Once the logical standby has been upgraded, SQL Apply must be restarted to apply the redo data from the primary database, which is still running the earlier version.
* Perform a switchover to the logical standby database (4): After confirming that the logical standby database is successfully applying redo data, perform a switchover to make it the new primary database.
* Upgrade the old primary database (6): With the new primary database now in place, upgrade the old primary database (which is now the new standby) to the new Oracle Database release.
* Start SQL Apply on the old primary database (3): Finally, start SQL Apply on what is now the standby database to synchronize it with the new primary database.References:
* Oracle Data Guard Concepts and Administration Guide
* Oracle Database Upgrade Guide

NEW QUESTION # 38
Which THREE statements are true about snapshot standby databases?

* A. FLASHBACK DATABASE must be manually enabled on a physical standby database before converting it into a snapshot standby database.
* B. FLASHBACK DATABASE is enabled automatically on a physical standby database as part of the conversion into a snapshot standby database, if not already enabled.
* C. A snapshot standby database may be opened read-write.
* D. A snapshot standby database may be opened read-only.
* E. FLASHBACK DATABASE is enabled automatically on a snapshot standby database after converting it from a physical standby database if not already enabled.
* F. A snapshot standby database can have Real-Time apply enabled.
Answer: B,C,E

Explanation:
Snapshot standby databases are a feature of Oracle Data Guard that allows a physical standby database to be temporarily converted into a read-write database for testing or other purposes. The true statements about snapshot standby databases are:
* FLASHBACK DATABASE is enabled automatically on a snapshot standby database after converting it from a physical standby database if not already enabled (emoticon: When a physical standby is converted to a snapshot standby, FLASHBACK DATABASE is automatically enabled to allow the database to be easily reverted back to its original state.
* FLASHBACK DATABASE is enabled automatically on a physical standby database as part of the conversion into a snapshot standby database, if not already enabled (C): As part of the conversion process, FLASHBACK DATABASE is turned on to ensure that changes made while the database is in snapshot standby mode can be undone.
* A snapshot standby database may be opened read-write (E): Once a physical standby is converted to a snapshot standby, it can be opened for read-write operations, allowing for testing and other tasks that require a writable database.
References:
* Oracle Data Guard Concepts and Administration
* Oracle Database Backup and Recovery User's Guide

NEW QUESTION # 39
......

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