1z0-915-1 MySQL HeatWave Implementation Associate Rel 1 Questions and Answers

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

When training a classification model with MySQL HeatWave AutoML, the following requirements must be met:

The target column and all feature columns must be stored in a single table(Answer B): All data necessary for training the model should be in one table to simplify the data processing and training pipeline.

The target column must have at least two distinct values(Answer E): For classification tasks, the target column must have multiple distinct values to enable the model to differentiate between classes.

References:

MySQL HeatWave AutoML Documentation

MySQL HeatWave User Guide

A.You can set a value for any global MySQL variable in a configuration: MySQL HeatWave allows you to configure and set global MySQL variables to optimize performance and customize the environment as needed.

C.You can view custom configuration sets with the OCI CLIoci mysql db-system getcommand: The OCI CLI provides commands to retrieve details about MySQL DB systems, including custom configurations.

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

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 creating a replication channel and selecting "Source cannot use GTID auto-positioning", it typically indicates that the source's GTID mode is off. GTID (Global Transaction Identifier) auto-positioning allows for automated recovery and positioning of transactions in replication, but it requires that GTID mode be enabled on the source database.

Data loaded into a MySQL HeatWave cluster:

B.Data is partitioned across cluster nodes for scalability: This allows the system to distribute the workload and handle large datasets efficiently. D.Data is stored in hybrid columnarformat to speed up analytic queries: The hybrid columnar format optimizes storage and speeds up query performance, especially for analytic workloads.

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

When changing the storage size of a DB system,you cannot decrease the DB system's storage size(Answer B). This restriction ensures data integrity and prevents potential data loss that could occur if the storage size were reduced.

You can only increase the storage size of the DB system.

The storage increase is done online without shutting down the DB system, allowing for uninterrupted operations.

References:

OCI MySQL DB System Scaling Documentation

To prepare data for a new DB system with data import in OCI, you shouldexport the data into an Object Storage bucket with a MySQL Shell dump utility(Answer B). This method allows you to store the data in a scalable and durable object storage service before importing it into the new DB system.

Steps:

Use MySQL Shell dump utility to export the data.

Save the export files to an Object Storage bucket in OCI.

Import the data from the Object Storage bucket into the new DB system.

References:

MySQL Shell Documentation

OCI Object Storage Documentation

To enable client applications to connect to a MySQL DB system that uses default port numbers and is attached to a subnet, you need tocreate an ingress rule that allows stateful connections on port 3306 and 33060(Answer C).

Ingress Rule: An ingress rule specifies the types of inbound connections that are allowed to a resource within a subnet.

Stateful Connections: Stateful connections keep track of the state of network connections passing through them, allowing return traffic to pass automatically.

Steps:

Navigate to the Virtual Cloud Network (VCN) in the OCI Console.

Open the subnet to which the MySQL DB system is attached.

Add an ingress rule to the subnet's security list to allow traffic on port 3306 (MySQL) and 33060 (MySQL X Protocol).

Ensure the rule is stateful to maintain the connection state.

References:

OCI Networking Documentation

MySQL X Protocol Documentation

When you perform a switchover of a high-availability DB system with an attached HeatWave cluster, theHeatWave cluster is attached to the new primary instance(Answer B). This ensures continuous operation and access to the HeatWave cluster's capabilities without the need to delete or re-create the cluster.

During a switchover, the system promotes the standby instance to the primary role.

The HeatWave cluster, which was previously attached to the original primary instance, is now re-attached to the new primary instance.

This allows the new primary instance to continue processing queries using the HeatWave cluster seamlessly.

References:

MySQL HeatWave High Availability Documentation

When restoring the backup of a stand-alone DB system to a new DB system, the following changes are allowed:

Use a different subnet for the new DB system(Answer B): You can select a different subnet within the same VCN or a different VCN for the new DB system, providing flexibility in network configuration.

Use a different shape for the new DB system(Answer C): You can choose a different compute shape for the new DB system, allowing you to scale the compute resources according to the requirements.

References:

OCI MySQL Database Service Backup and Restore Documentation

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

When creating a channel for replication in MySQL, the following must be provided:

Channel name(Answer A): The unique identifier for the replication channel.

Source connection SSL mode(Answer B): Specifies the SSL mode for the connection to the source server.

Source connection password(Answer D): The password for the source server connection.

Steps:

UseCHANGE MASTER TOcommand to set up the replication channel.

Provide the channel name, SSL mode, and connection password as part of the configuration.

References:

MySQL Replication Documentation

Setting Up Replication Channels