Oracle 1z0-915-1 MySQL HeatWave Implementation Associate Rel 1 Exam Practice Test

Based on the provided SQL statements, the following two are true:

The data placement key of the airport table is airport_id(Answer A): The primary keyairport_idis used as the data placement key in theairporttable. This means that the data in the table is organized based on theairport_idvalues.

The data of the airport table is loaded into the MySQL DB system(Answer D): TheALTER TABLE airport SECONDARY_LOAD;statement successfully loads the data from the specified object storage file into the MySQL DB system.

References:

MySQL HeatWave Documentation

MySQL Engine Attributes

Automatic DB system version upgrades in OCI are performed to the next release in sequence. This means that the system is upgraded to the next available version rather than skipping to the most recent release, ensuring a stable and tested upgrade path.

To train a model that predicts sales, the appropriate machine learning task would be regression, as it involves predicting a continuous value (sales) based on the given data. The command to train such a model is:

D.CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'regression'), @model);

This command calls theML_TRAINprocedure on theml_data.salestable, withSalesas the target variable, specifying the task as regression.

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

In MySQL HeatWave configurations, dynamic variables can be changed without requiring the configuration to be copied to a new configuration. This allows for more flexible and immediate adjustments to system settings without the need for a server restart or creating a new configuration instance.

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.

To connect to a MySQL DB system from an OCI Cloud Shell session when the VCN is not configured with VCN peering, VPN access, or FastConnect, the following must be true:

A.You must attach the Cloud Shell session to a VCN subnet that can connect to the MySQL DB system: The Cloud Shell must be in the same network or have a route to the network containing the MySQL DB system. C.The MySQL DB system subnet must be in theCloud Shell tenancy home region: Cloud Shell sessions operate within the OCI home region, so the target MySQL DB system must be accessible from within the same region.

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

To copy transactions from an on-premises MySQL instance to a DB system, you useinbound replication(Answer B).

Inbound Replication: This feature allows the MySQL DB system to receive and apply changes (transactions) from an external MySQL instance.

Replication Configuration: You need to set up replication between the on-premises MySQL instance and the MySQL DB system by configuring the master (on-premises) and the slave (DB system) appropriately.

References:

MySQL Replication Documentation

OCI MySQL Database Service Documentation

You can determine the uptime of a DB system bychecking the DB system details in the OCI Web console(Answer B). The console provides information on the system status, including the uptime since the last start.

Steps:

Log in to the OCI Web console.

Navigate to the MySQL DB system.

View the details page of the DB system, where the uptime information is displayed.

References:

OCI Console Documentation

Monitoring DB System Uptime

To determine whether a query is offloaded to the HeatWave cluster for execution,check the value of therapid_query_offload_countglobal status variable(Answer B).

rapid_query_offload_count: This variable indicates the number of queries that have been offloaded to the HeatWave cluster. By checking its value before and after running the query, you can determine if the query was offloaded.

Steps:

Connect to the MySQL DB system.

RunSHOW GLOBAL STATUS LIKE 'rapid_query_offload_count';before and after executing the query to see if the count increases, indicating offloading.

References:

MySQL HeatWave Documentation

Monitoring HeatWave Status Variables

The commandmysqlsh john@10.0.1.122 --auth-method=authentication_oci_clientdoes not require a password because it uses the OCI (Oracle Cloud Infrastructure) client authentication method. This method relies on the correct API key-pair specified in the~/.oci/configfile. This file contains the necessary credentials (user OCID, tenancy OCID, API keys, etc.) to authenticate with the OCI environment without needing a password for each connection.

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

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

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.

To deploy a high-availability MySQL DB system in a region with multiple availability domains, the following types of subnets provide maximum redundancy:

A private regional subnet(Answer B): This type of subnet spans all availability domains in the region, ensuring high availability and fault tolerance.

A public regional subnet(Answer C): Similar to the private regional subnet, a public regional subnet spans all availability domains, providing maximum redundancy and accessibility.

References:

OCI Networking Documentation

MySQL High Availability Documentation

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

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.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.