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Oracle Cloud Database Services 2025 Professional Sample Questions (Q62-Q67):

NEW QUESTION # 62
How does HeatWave address the challenges of Online Analytical Processing (OLAP) compared to traditional row-based database systems?

A. HeatWave uses a specialized indexing technique to speed up data retrieval.
B. HeatWave automatically shards the database to distribute the workload across multiple nodes.
C. HeatWave leverages AI-powered indexing to optimize the data retrieval.
D. HeatWave employs a columnar data format in memory, enabling faster scans and aggregations for complex queries.
E. HeatWave leverages a distributed caching mechanism to store frequently accessed data.

Answer: D

Explanation:
HeatWave's Columnar Processing:
HeatWave improves OLAP performance by storing data in acolumnar formatin memory. This format is particularly efficient foranalytical queriesbecause:
* It minimizes the amount of data read by only scanning thenecessary columns.
* Columnar storage supportsvectorized processing, which significantly speeds up aggregation operations.
* Beingin-memory, it eliminates disk I/O bottlenecks, crucial for high-speed analytics.
Why the other options are incorrect:
* A:Indexing is useful, but columnar storage is the primary driver of speed.
* C:Caching improves access times but does not address the fundamental OLAP challenge of processing large datasets.
* D:HeatWave distributes workload usingparallel processing, not simple sharding.
* E:AI-powered indexing is not a core feature of HeatWave.

NEW QUESTION # 63
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 determine if the patch or upgrade is compatible with the existing database environment and identify potential conflicts.
C. To install the patch or upgrade in a test environment for validation.
D. To optimize the database performance after the patch or upgrade.
E. To migrate data to a different storage tier.

Answer: B

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 # 64
Within an IAM policy for Oracle NoSQL Database Cloud Service, what is the purpose of the "resource" element when defining table access permissions?

A. To determine the geographical region where the NoSQL database is located.
B. To set the expiration date for the IAM policy.
C. To specify the IAM group that the policy applies to.
D. To define the specific NoSQL table or tables to which the policy's permissions apply.

Answer: D

Explanation:
B: Define specific NoSQL table permissions:
* The"resource"element specifies which Oracle NoSQL tables the IAM policy will apply to.
* It allows fine-grained access control by linking specific tables to permission statements.
* This ensures that only authorized users or groups can perform operations on specified tables.
Example IAM Policy Syntax:
{
"action": "nosql:table:read",
"resource": "ocid1.nosqltable.oc1..exampleuniqueID",
"effect": "allow"
}
Why the other options are incorrect:
* A. Specify IAM group:Groups are defined in the"subject"element, not the "resource" element.
* C. Geographical region:The region is usually part of theOCID(Oracle Cloud Identifier), not directly specified in the resource element.
* D. Set expiration date:Expiry is not defined within the "resource" element.

NEW QUESTION # 65
Which of the following is the recommended approach for migrating a large, mission-critical database from an on-premises Exadata system to Exadata Database Service with minimal downtime?

A. Performing a full backup and restore to a new Exadata Database Service instance.
B. Traditional export/import using Data Pump over a public network.
C. Creating a physical standby database using Data Guard and switching over to the standby in OCI.
D. Using SQL Developer to copy the data over a VPN connection.

Answer: C

Explanation:
B: Using Data Guard for physical standby and switchover:
* This method enablesminimal downtimemigration.
* Steps:
* Configure Data Guard to synchronize thestandby databasewith the primary on-premises database.
* Once synchronized, perform aswitchoverto make the standby the new primary.
* Downtime is limited to the switchover duration.
* This approach leveragesreal-time replicationto minimize disruption.
Why the other options are incorrect:
* A. Export/Import with Data Pump:Too time-consuming for large databases.
* C. Full backup and restore:High downtime due to the time required for data transfer and restoration.
* D. Copying via SQL Developer:Not feasible for mission-critical and large databases due to slow transfer speeds.

NEW QUESTION # 66
Which statement accurately describes the patching process for Oracle Grid Infrastructure (GI) and ASM components on a BaseDB VM system when using user-managed patching?

A. GI and ASM patching is fully automated by Oracle Cloud Infrastructure and requires no user intervention.
B. Patching GI and ASM components is only required when the operating system of the VM is upgraded.
C. GI and ASM patching is integrated with the database patching process and is automatically handled when the database is patched.
D. The DBA must manually download the GI and ASM patch bundles and apply them using the appropriate patching tools.

Answer: D

Explanation:
B: Manual patching for GI and ASM:
* In auser-managed environment, the DBA is responsible for downloading and applying patches for Grid Infrastructure (GI)andAutomatic Storage Management (ASM).
* These patches are distinct fromdatabase patchesand need to be applied using tools likeopatchorOracle Universal Installer (OUI).
* The process involves:
* Downloading the patch from Oracle Support.
* Staging the patch on the server.
* Applying the patch using the appropriate commands.
Why the other options are incorrect:
* A. Fully automated by OCI:OCI does not automatically patch GI and ASM in user-managed environments.
* C. Integrated with database patching:GI and ASM patching is handled separately.
* D. Required only during OS upgrade:Incorrect, as patching is required independently for security and stability.

NEW QUESTION # 67
......

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