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Oracle Cloud Database Services 2025 Professional Sample Questions (Q22-Q27):

NEW QUESTION # 22
Which two functionalities are provided by the SQL Performance Analyzer (SPA) within Database Management, aiding in cloud database tuning?

A. Automatically rewrite SQL queries to improve their performance.
B. Analyze the execution plan of a SQL statement and suggest alternative indexing strategies.
C. Generate a report highlighting the performance impact of a specific database change on a set of SQL statements.
D. Compare the performance of SQL statements before and after a database change (e.g., upgrade, parameter change).

Answer: C,D

Explanation:
B: Compare SQL performance before and after changes:
* SPA evaluates the effect of configuration changes, upgrades, or patches on SQL performance.
* Provides insights into whether a change improves or degrades query performance.
C: Generate performance impact reports:
* SPA generates reports summarizing the effects of specific changes on SQL workload performance.
* Helps DBAs make informed decisions before implementing changes in production.
Why the other options are incorrect:
* A. Automatically rewriting SQL:SPA does not modify queries; it only analyzes and compares performance.
* D. Suggesting indexing strategies:SPA evaluates performance impacts, but indexing recommendations are made by the SQL Tuning Advisor.

NEW QUESTION # 23
What is the PRIMARY benefit of using Recovery Manager (RMAN) with block change tracking enabled in a BaseDB environment for incremental backups?

A. It significantly reduces the time required for incremental backups by only backing up changed blocks.
B. It eliminates the need for full backups.
C. It automatically validates the integrity of full backups during the backup process.
D. It automatically encrypts all backups with a user-defined key.
E. It allows for point-in-time recovery to any SCN (System Change Number) without restoring a full backup.

Answer: A

Explanation:
Block Change Tracking (BCT):
Enabling BCT withRMANsignificantly speeds upincremental backupsby recording changes made to data blocks since the last backup. Instead of scanning the entire database to detect changes, RMAN consults the block change tracking fileto identify modified blocks, reducing backup time and I/O.
BCT is especially beneficial in large databases where full backups would be time-consuming and resource- intensive. Incremental backups become more efficient, makingdaily or more frequent backups feasible.
Why the other options are incorrect:
* A:Full backups are still required periodically.
* C:Encryption is separate from BCT functionality.
* D:Point-in-time recovery is facilitated by backup logs, not BCT directly.
* E:Integrity checks are performed during validation, not as part of BCT.

NEW QUESTION # 24
When using a NoSQL Database Cloud Service SDK, what is the purpose of handling exceptions or errors returned by the SDK?

A. To provide detailed performance metrics to the database administrators.
B. To automatically recover from hardware failures in the cloud.
C. To ensure data consistency by retrying failed operations.
D. To implement custom logic for handling specific error conditions, such as record not found or insufficient capacity.

Answer: D

Explanation:
Exception Handling in SDKs:
When developing applications using theOracle NoSQL Database Cloud Service SDK, it is essential to implementerror handling logic. This typically includes managing cases like:
* Record Not Found:Handling situations where a queried record does not exist.
* Insufficient Capacity:Managing requests when throughput limits are exceeded.
* Network Failures:Retrying operations or providing fallback mechanisms.The goal is to buildrobust and resilient applicationsthat gracefully handle unexpected conditions.
Why the other options are incorrect:
* A:Cloud infrastructure handles hardware recovery, not the SDK.
* B:While retrying may ensure consistency, it is the developer's responsibility to implement it.
* C:Performance metrics are gathered via monitoring tools, not exception handling.

NEW QUESTION # 25
In the context of BaseDB Database Lifecycle Management, what is the primary purpose of a "pre-check" utility before applying a patch or upgrading the database?

A. To automatically back up the database before the patch or upgrade.
B. To install the patch or upgrade in a test environment for validation.
C. To optimize the database performance after the patch or upgrade.
D. To migrate data to a different storage tier.
E. To determine if the patch or upgrade is compatible with the existing database environment and identify potential conflicts.

Answer: E

Explanation:
Purpose of Pre-Check Utility:
Thepre-check utilityin BaseDB ensures that thedatabase environment is readyfor the upcoming patch or upgrade. It checks for:
* Compatibility issueswith the existing software and configurations.
* Resource availability(like CPU, memory, and storage).
* Dependencies and prerequisitesneeded for a successful upgrade.By identifying potential conflicts in advance, pre-checksminimize the risk of upgrade failuresand reduce downtime.
Why the other options are incorrect:
* A:Backup is a separate process.
* C:Pre-check does not install or validate in a test environment.
* D:Performance optimization happens post-upgrade.
* E:Data migration is unrelated to the pre-check process.

NEW QUESTION # 26
When migrating a MySQL instance to MySQL HeatWave, which method generally provides the MINIMAL downtime for large databases?

A. Using a third-party ETL tool to extract, transform, and load the data into the HeatWave instance.
B. Using mysqldump to create a logical backup and restoring it to the HeatWave instance.
C. Utilizing MySQL replication to replicate data to the HeatWave instance and then performing a switchover.
D. Copying the data files directly from the source instance to the HeatWave instance.
E. Creating a physical backup using MySQL Enterprise Backup and restoring it to the HeatWave instance.

Answer: C

Explanation:
Using MySQL Replication for Minimal Downtime:
Replication allows forreal-time synchronizationbetween the source MySQL instance and theHeatWave instance. Once the replication catches up, performing aswitchoverto the HeatWave instance ensures minimal disruption.
* This method is especially effective forlarge databases, as data is continuouslysynchronized during the migration process.
* The switchover itself incurs minimal downtime as the applications are redirected to the new instance.
Why the other options are incorrect:
* A:mysqldump and restore are time-consuming for large datasets.
* B:Physical backup and restore are faster than logical, but still involve significant downtime.
* D:Direct data file copying is risky and may cause data corruption.
* E:ETL processes are typically slow and prone to data consistency issues.

NEW QUESTION # 27
......

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