1z0-915-1 Oracle MySQL HeatWave Implementation Associate Rel 1 Free Practice Exam Questions (2025 Updated)

To minimize DB system downtime caused by automatic maintenance operations, you should enable high availability. High availability ensures that there are multiple instances of your database running in different fault domains or availability domains, reducing the impact of maintenance on the system's availability.

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.

To use the point-in-time recovery feature in a DB system,automatic backupsmust be enabled (Answer B).

Point-in-Time Recovery: This feature allows you to restore your database to a specific point in time, which is crucial for recovering from accidental data loss or corruption.

Automatic Backups: These provide the necessary backup data that can be used to restore the database to the desired point in time.

References:

OCI MySQL Database Service Point-in-Time Recovery

Automatic Backups Documentation

When exporting data to Object Storage withMySQL Shell util.dumpInstance,you must specifyociParManifest: true(Answer B). This option creates a pre-authenticated request (PAR) manifest file, which allows for secure access and upload to Object Storage without requiring direct credentials.

References:

MySQL Shell Documentation

OCI Object Storage Documentation

The following are features of MySQL AutoPilot:

Auto encoding(Answer C): MySQL AutoPilot automatically determines the best encoding for data to optimize storage and performance.

Auto provisioning(Answer D): MySQL AutoPilot can automatically provision additional resources based on workload demands, ensuring optimal performance.

AutoML(Answer E): MySQL AutoPilot includes AutoML capabilities, which automate the process of machine learning model selection, training, and deployment.

References:

MySQL HeatWave AutoPilot Documentation

MySQL AutoPilot Features

To speed up the data load into a DB system usingMySQL Shell util.loadDump(), you can use thedeferTableIndexes: alloption (Answer D). This option defers the creation of indexes until after the data has been loaded, which can significantly improve the speed of the loading process.

Steps:

Export your data using MySQL Shell dump utility.

Useutil.loadDump()to import the data and specify thedeferTableIndexes: alloption.

The data is loaded without building indexes initially, reducing the time required for the import.

After the data load is complete, indexes are created in a batch process, which is more efficient than creating them during the data load.

References:

MySQL Shell Dump & Load Documentation

When performing a node estimate while adding a HeatWave cluster to a DB system in OCI Console, the process undertakes the following tasks:

Estimate the number of OCPUs required to process selected user tables(Answer B): The node estimation process calculates the necessary OCPUs based on the size and complexity of the tables selected by the user. This ensures that the cluster has adequate processing power for efficient performance.

Estimate the memory required for each user table(Answer C): This task involves determining the memory requirements for each table that will be loaded into the HeatWave cluster. This ensures that there is sufficient memory to handle the data and execute queries efficiently.

References:

OCI Console Documentation on HeatWave

MySQL HeatWave User Guide

You can stop a MySQL DB system using the following methods:

A.Use the STOP action on the DB system details page in the OCI Console: This is a straightforward way to stop the DB system via the Oracle Cloud Infrastructure web interface. D.Execute themysql db-system stopcommand from OCI CLI: This command uses the Oracle Cloud Infrastructure Command Line Interface to stop the DB system programmatically.

When creating a Bastion service to connect to a MySQL DB system, the following are true:

The Bastion CIDR block allowlist must include the IP address of all valid client machines(Answer C): This ensures that only the IP addresses specified in the allowlist can access the Bastion service, enhancing security by restricting access to known clients.

The Bastion subnet must have an ingress rule to allow stateful connections on the MySQL DB system port number(Answer E): This allows the Bastion service to communicate with the MySQL DB system by permitting traffic through the necessary ports.

References:

OCI Bastion Service Documentation

Setting Up Bastion with MySQL DB System

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

When a DB system has been successfully deleted, the following operations are allowed:

Restore the DB system from an existing manual backup(Answer C): Even after the DB system is deleted, you can restore it from any existing manual backups. This allows you to recover the data and configuration from a point-in-time backup.

View the API call logs on the Audit page(Answer E): You can view the API call logs related to the deleted DB system on the Audit page. These logs provide a record of actions taken on the DB system, including the deletion event.

References:

OCI Backup and Restore Documentation

OCI Audit Documentation

To determine the version of MySQL running on your DB system, you can use the following SQL statements:

SELECT @@version;(Answer B): This query retrieves the MySQL server version from the system variables.

SHOW VARIABLES LIKE 'version';(Answer C): This query displays the server version along with other related version variables.

Steps:

Connect to your MySQL DB system.

Execute eitherSELECT @@version;orSHOW VARIABLES LIKE 'version';to retrieve the version information.

References:

MySQL Server Version Information

SHOW VARIABLES Syntax

Creating a new DB system with data import provides the benefit of faster import with minimal logging. This process is optimized to import large datasets efficiently and quickly, reducing the amount of logging overhead and ensuring a rapid setup of the new DB system.

A query may not be offloaded to the HeatWave cluster for execution due to the following reasons:

A.Theuse_secondary_enginesession variable is OFF: This setting controls whether queries should be offloaded to the secondary engine (HeatWave). B.The client is connected to the DB system instead of the HeatWave cluster: For queries to be offloaded, the client must be connected to the HeatWave cluster. E.A required column is excluded from the RAPID secondary engine: If a necessary column is not available in the HeatWave (RAPID) secondary engine, the query cannot be offloaded.

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.

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

The following are true about the read replica load balancer:

It distributes connections among the source DB system and all read replicas(Answer B): The load balancer distributes incoming read traffic across all read replicas and the source DB system to balance the load and improve performance.

It distributes connections among read replicas(Answer E): The load balancer ensures that read traffic is evenly distributed among all available read replicas, providing high availability and scalability for read operations.

References:

OCI MySQL Database Service Read Replicas Documentation

To create a second user calledadmin2with the same privileges as the administrator, you can use the following statement:

D.CREATE USER admin2 IDENTIFIED BY 'Password'; GRANT ALL PRIVILEGES ON *.* TO admin2 WITH GRANT OPTION;

This creates the useradmin2and grants all privileges, along with the ability to grant those privileges to other users.