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Oracle Cloud Database Services 2025 Professional Sample Questions (Q25-Q30):

NEW QUESTION # 25
While operating a MySQL HeatWave cluster, you need to resize the HeatWave cluster to accommodate an increased workload. Which method is the most efficient and recommended way to scale the HeatWave cluster?

A. Performing a manual data export and import into a new, larger MySQL Database System.
B. Using the OCI CLI or Console to adjust the HeatWave cluster's shape and node count.
C. Recreating the HeatWave cluster with the desired size.
D. Manually altering the innodb_buffer_pool_size and restarting the MySQL server.
E. Modifying the underlying VM shapes of the MySQL Database System.

Answer: B

Explanation:
Scaling HeatWave Efficiently:
TheOCI CLI or Consoleprovides a streamlined way to scale the HeatWave cluster. You can easily change the shape and node countthrough the console without significant downtime. The system handles the necessary data redistribution and configuration updates automatically.
* This method minimizes disruption and is significantly faster than manual reconfiguration.
* OCI's automated scaling ensures that the cluster maintainsoptimal performancethroughout the operation.
Why the other options are incorrect:
* A:Adjusting buffer size affects memory, not cluster size.
* C:Changing VM shapes does not directly affect HeatWave.
* D:Recreating the cluster is inefficient and time-consuming.
* E:Manual export/import introduces downtime and is not efficient for scaling.

NEW QUESTION # 26
Which statement accurately describes the function of the HeatWave service in relation to a standard MySQL database?

A. HeatWave provides an in-memory, massively parallel query accelerator to MySQL, improving analytical query performance.
B. HeatWave is a clustering solution, where a single MySQL instance is split into multiple parts.
C. HeatWave is a specialized version of MySQL designed solely for transactional workloads, optimized for high concurrency.
D. HeatWave acts as a caching layer in front of MySQL, speeding up access to frequently accessed data.
E. HeatWave is a standalone database system that replaces MySQL, offering enhanced security features.

Answer: A

Explanation:
HeatWave as a Query Accelerator:
HeatWave enhances theMySQL Database Serviceby providing anin-memory, massively parallel query accelerator. It is specifically designed to speed upanalytical (OLAP) queries, making them run significantly faster compared to using MySQL alone.
* The system stores data in acolumnar formatand processes it in memory, utilizingdistributed, parallel processingto achieve high performance.
* Unlike traditional MySQL setups, HeatWave canexecute complex analytical workloadsefficiently.
Why the other options are incorrect:
* A:HeatWave is not a standalone database but an extension of MySQL.
* C:It is optimized foranalytical workloads, not transactional.
* D:It is more than just a caching layer; it actively processes queries.
* E:HeatWave clusters do not split MySQL instances but enhance query processing.

NEW QUESTION # 27
In a column-family NoSQL database, what is the purpose of a "super column"?

A. To represent a single value associated with a row key.
B. To define the primary key for the entire database.
C. To group related columns together, providing a level of hierarchy within the column family.
D. To store large binary objects (BLOBs).

Answer: C

Explanation:
Super Columns in Column-Family Databases:
Asuper columnis a higher-level construct used incolumn-family NoSQL databases(like Apache Cassandra).
It groups related columns together under a single name, forming atwo-level hierarchywithin a column family.
* This structure is useful when storing data that naturally fits anested or hierarchical format.
* For example, a user profile might contain super columns like "Address" (with sub-columns like
"Street", "City", "ZIP") and "Contacts" (with sub-columns like "Phone", "Email").
Why the other options are incorrect:
* A:A regular column represents a single value associated with a row key.
* C:Primary keys are defined at the row level, not using super columns.
* D:While BLOBs can be stored, the primary role of a super column is togroup related columns, not store binary data.

NEW QUESTION # 28
What is the primary purpose of the AutoML feature within MySQL HeatWave?

A. To automatically generate SQL queries based on natural language input.
B. To automatically back up and restore the MySQL database to Oracle Cloud Infrastructure Object Storage.
C. To automatically tune the MySQL server parameters for optimal transactional performance.
D. To automate the process of building, training, and deploying machine learning models directly within the database.
E. To automatically generate data visualization to present database insights.

Answer: D

Explanation:
AutoML in MySQL HeatWave:
TheAutoML featurein MySQL HeatWave integratesmachine learning capabilitiesdirectly within the database, allowing users to:
* Build, train, and deploy modelswithout moving data to external systems.
* Automate the entire ML pipeline, includingdata preprocessing, model selection, and hyperparameter tuning.
* This makes it easier for data engineers and analysts to performpredictive analyticswithout requiring data science expertise.
Why the other options are incorrect:
* A:AutoML does not focus on server tuning; it focuses on machine learning.
* C:Generating SQL queries from natural language is not within AutoML's scope.
* D:AutoML is unrelated to database backup.
* E:Visualization is not the primary function; it focuses on model building.

NEW QUESTION # 29
In a BaseDB environment configured with automatic backups, what happens to the automatic backups when the DB system is terminated?

A. The retention of automatic backups after DB system termination is configurable during DB system creation.
B. The most recent automatic backup is retained, while older backups are deleted.
C. All automatic backups are immediately and permanently deleted from object storage.
D. All automatic backups are retained in object storage for a period determined by the original backup retention policy.
E. Automatic backups are migrated to a lower-cost archive storage tier.

Answer: D

Explanation:
Backup Retention Policy:
When aBaseDB system is terminated, automatic backups are not immediately deleted. Instead, they remain stored inOCI Object Storagefor the duration specified by thebackup retention policythat was configured at the time of database creation.
* This approach ensures that data can be recovered even after the database instance itself is terminated.
* Administrators can manually delete backups if they are no longer needed, but they arenot automatically purged.
Why the other options are incorrect:
* A:Backups are not deleted instantly upon termination.
* B:All backups are retained as per the policy, not just the most recent.
* D:No automatic migration to archive tier occurs.
* E:Backup retention settings are defined during provisioning, but not dynamically configurable after termination.

NEW QUESTION # 30
......

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