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Oracle 1z0-915-1 Online Practice Test (Oracle-1z0-915-1-Practice-Test)

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Oracle MySQL HeatWave Implementation Associate Rel 1 Sample Questions (Q15-Q20):

NEW QUESTION # 15
Which two are benefits of read replicas? (Choose two.)

A. Reduce down time.
B. Reduce query latency.
C. Scale read queries.
D. Reduce network latency.
E. Speed up analytical queries.

Answer: B,C

Explanation:
A:Reduce query latency: By distributing read queries across multiple replicas, the load on the primary instance is reduced, which can decrease query latency. D.Scale read queries: Read replicas allow scaling of read operations by providing additional instances to handle read queries, improving overall performance and throughput.

NEW QUESTION # 16
You have successfully provisioned a MySQL DB system on Oracle Cloud Infrastructure by using OCI Console. You have installed the standard MySQL client libraries and MySQL Shell on your workstation that is not connected to any VPN, FastConnect, or SSH tunnel.
You CANNOT connect directly to the DB system endpoint from your workstation connected to the Internet.
What is the reason?

A. MySQL DB system allows only connections through a proxy server.
B. MySQL DB system allows only SSL-encrypted connections.
C. MySQL DB system endpoint does not have a public IP address.
D. MySQL DB system cannot use the standard MySQL client libraries.

Answer: C

Explanation:
If you cannot connect directly to the MySQL DB system endpoint from your workstation connected to the Internet, the reason is thatMySQL DB system endpoint does not have a public IP address(Answer B).
* Private Subnet: The MySQL DB system is provisioned in a private subnet, which means it is not directly accessible from the Internet.
* Network Accessibility: To access the DB system, you need to establish a secure connection via a VPN, FastConnect, or SSH tunnel.
References:
* Connecting to a MySQL DB System
* OCI Networking Documentation

NEW QUESTION # 17
Which table option defines a Lakehouse external table based on a CSV file?

A. ENGINE=lakehouse SECONDARY_ENGINE=csv ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }'
B. ENGINE=csv SECONDARY_ENGINE=rapid ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }'
C. ENGINE=csv SECONDARY_ENGINE=lakehouse ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }'
D. ENGINE=lakehouse SECONDARY_ENGINE=rapid ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }'

Answer: C

Explanation:
B:ENGINE=csv SECONDARY_ENGINE=lakehouse ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }': This table option defines a Lakehouse external table based on a CSV file. It specifies thecsvengine for the table and uses thelakehouseas the secondary engine, along with the file's location details in OCI Object Storage.

NEW QUESTION # 18
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?

A. Disabling point-in-time recovery
B. Deleting the DB system
C. Disabling delete protection
D. Enabling point-in-time recovery

Answer: B

Explanation:
When automatic backup retention of a DB system is disabled,deleting the DB system(Answer C) will delete all automatic backups of the DB system.
* Automatic Backups: These are backups created automatically by the OCI service to ensure data protection.
* Backup Deletion: If automatic backups are disabled and you delete the DB system, all associated automatic backups are also deleted. This operation is irreversible, and you should ensure that necessary backups are taken before deleting the DB system.
References:
* OCI MySQL Database Service Backup and Restore

NEW QUESTION # 19
Which MySQL HeatWave AutoML routine evaluates a model?

A. ML_SCORE
B. ML_PREDICT_TABLE
C. ML_EXPLAIN
D. ML_EXPLAIN_TABLE
E. ML_TRAIN

Answer: A

Explanation:
The MySQL HeatWave AutoML routine that evaluates a model isML_SCORE. This routine scores a trained machine learning model on a new dataset and evaluates its performance.

NEW QUESTION # 20
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