1z0-915-1 Practice Questions

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.

A.  

D.  

When creating a new MySQL DB system in the OCI Console, you have the following options:

High availability(Answer A): This option allows you to create a DB system that can automatically fail over to a standby instance in case of hardware or software failure, ensuring minimal downtime.

Standalone server(Answer C): This option lets you create a DB system with a single instance, suitable for workloads that do not require high availability or read replicas.

References:

OCI MySQL Database Service Documentation

MySQL High Availability

To connect to a MySQL DB system using MySQL Shell, you can use several command-line formats. Here, we will analyze the provided options:

A.  

Incorrect format. The password should not be directly placed after the-pflag without a space or equals sign.

B.  

Incorrect format. The username should come before the password in the URL.

C.  

Correct format. This is a valid way to connect using a URL-like format whereadminis the username,MySQL8.0is the password, and10.0.1.221is the host.

D.  

Correct format. This is a valid way to connect using flags, with no spaces between the flags and their values.

E.  

Incorrect format. MySQL Shell uses-h,-u, and-pfor specifying host, username, and password respectively.

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

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