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Test 1z0-915-1 Preparation, 1z0-915-1 Test Pattern

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Oracle 1z0-915-1 Exam Syllabus Topics:

Topic
Details

Topic 1

MySQL HeatWave Configurations: For database administrators and performance tuning specialists, this part of the exam covers creating custom configurations, comparing configurations, describing the effects of changing dynamic and non-dynamic variables, and updating a DB system configuration.

Topic 2

HeatWave Cluster: For database performance specialists and cloud architects, this section of the exam covers

Topic 3

Backing up and restoring DB systems: For database administrators and disaster recovery specialists, this section of the exam covers backing up and restoring a DB system, managing automatic backups, and performing point-in-time recovery.

Topic 4

Data Migrations: For data migration specialists and database administrators, this part of the exam covers creating a DB system with data import, importing data into a DB system, and exporting data from MySQL servers and DB systems.

Topic 5

Inbound Replication: For database administrators and replication experts, this section of the exam covers setting up and troubleshoot inbound replication and creating channels.

Oracle MySQL HeatWave Implementation Associate Rel 1 Sample Questions (Q38-Q43):

NEW QUESTION # 38
The first query has an estimated cost of 100,000,000 and is offloaded to a HeatWave cluster for execution:
SELECT flightno, departure, country FROM flight JOIN airport_geo ON 'from'=airport_id; The second query has an estimated cost of 10,000 and is NOT offloaded to the Heatwave cluster for execution:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
Which two methods can offload the second query to the Heatwave cluster for execution? (Choose two.)

A. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
B. SET use_secondary_engine=FORCED;
C. SET secondary_engine_cost_threshold=1000;
D. SET optimizer_trace="enabled=on";
E. CALL sys.heatwave_load('["airport_geo"]');

Answer: B,C

Explanation:
To offload the second query to the HeatWave cluster for execution, you can use the following methods:
* SET use_secondary_engine=FORCED(Answer A): This forces the use of the HeatWave secondary engine for query execution, regardless of the estimated cost.
* SET secondary_engine_cost_threshold=1000(Answer B): This lowers the cost threshold for queries to be offloaded to the HeatWave cluster, allowing queries with lower estimated costs to be offloaded.
Steps:
* Before running the second query, executeSET use_secondary_engine=FORCED;to force the offloading of queries to HeatWave.
* Alternatively, executeSET secondary_engine_cost_threshold=1000;to adjust the cost threshold, making the second query eligible for offloading.

NEW QUESTION # 39
You want to enable high availability of a stand-alone DB system. Which two conditions are required? (Choose two.)

A. The DB system delete protection must be enabled.
B. The DB system crash recovery must be enabled.
C. The DB system automatic backup must be enabled.
D. The DB system must be active.
E. The DB system point-in-time recovery must be enabled.

Answer: C,D

Explanation:
To enable high availability for a stand-alone DB system, the following conditions are required:
* The DB system must be active(Answer D): The DB system needs to be in an active state to enable high availability features.
* The DB system automatic backup must be enabled(Answer E): Automatic backups must be enabled to ensure data protection and facilitate failover operations.
Steps:
* Ensure the DB system is running and operational.
* Enable automatic backups through the OCI Console or API.
References:
* MySQL High Availability Documentation
* Automatic Backups Documentation

NEW QUESTION # 40
What must you do before deleting a DB system?

A. Stop the instance if it is running.
B. Disable delete protection if it is enabled.
C. Take a manual backup
D. Stop and remove any connected HeatWave Cluster.

Answer: B

Explanation:
Before deleting a DB system in Oracle Cloud Infrastructure (OCI), you mustdisable delete protection if it is enabled(Answer C). Delete protection is a feature that prevents accidental deletion of DB systems. If enabled, it must be turned off before the DB system can be deleted.
Steps:
* Navigate to the DB system in the OCI Console.
* Check if delete protection is enabled.
* If enabled, disable it by updating the DB system settings.
* Proceed with deleting the DB system.
References:
* OCI Console Documentation on DB System Management
* MySQL Database Service Documentation

NEW QUESTION # 41
You have successfully enabled high availability of a stand-alone DB system. Which is true?

A. The DB system has three instances running in different availability or fault domains.
B. The DB system provides new endpoints to connect to the secondary instances for read-only connections.
C. The DB system provides new port numbers on the same endpoint to connect to the secondary instances for read-only connections.
D. The DB system performs load balancing by distributing client connections to all instances.

Answer: A

Explanation:
When high availability is enabled for a stand-alone DB system,the DB system has three instances running in different availability or fault domains(Answer D).
* High Availability Configuration: This setup involves creating multiple instances of the DB system across different availability or fault domains to ensure redundancy and minimize the risk of downtime due to hardware or network failures.
* Instances: Typically, there are three instances-one primary and two replicas-ensuring that the system can failover seamlessly if one instance goes down.
References:
* OCI MySQL High Availability

NEW QUESTION # 42
Which placement is NOT valid for a high-availability DB system? (Note: AD refers to availability domain and FD refers to fault domain.)

A. Primary instance: AD1-FD1; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
B. Primary instance: AD1-FD3; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
C. Primary instance: AD1-FD1; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
D. Primary instance: AD1-FD3; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3

Answer: D

Explanation:
In a high-availability DB system, the placement of primary and secondary instances should ensure redundancy across different availability domains (ADs) and fault domains (FDs) to minimize downtime and data loss. The placement mentioned in option D is not valid because itplaces the primary and secondary instances in the same availability domain and fault domain, which does not provide high availability.

NEW QUESTION # 43
......

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Ella Nelson Ella Nelson

Biography

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