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Oracle MySQL HeatWave Implementation Associate Rel 1 Sample Questions (Q57-Q62):

NEW QUESTION # 57
There are more than 10 concurrent users running queries on the DB system. The airport_geo table has been loaded successfully into a HeatWave cluster.
You want to run this query:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
How do you determine whether the query is offloaded to the HeatWave cluster for execution?

A. Query the rpd_tables table in performance_schema.
B. View the Query Execution Plan of the query by running EXPLAIN.
C. Check the value of the rapid_query_offload_count global status variable.
D. Check the value of the hw_data_scanned global status variable.

Answer: C

Explanation:
To determine whether a query is offloaded to the HeatWave cluster for execution,check the value of the rapid_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

NEW QUESTION # 58
Why would you select "Source cannot use GTID auto-positioning" when creating a channel?

A. Some tables have no primary key
B. The target DB system is a high-availability DB system.
C. The binary log offset is unknown.
D. The source gtid mode is OFF.

Answer: D

Explanation:
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.

NEW QUESTION # 59
Which sequence of steps must you perform to change the configuration of a high-availability DB system?

A. Disable high availability, edit the DB system, change the configuration, and enable high availability.
B. Edit the DB system and change the configuration.
C. Edit and change the configuration of all secondary instances, switch over to a secondary instance, andedit and change the configuration of the former primary instance.
D. Stop the DB system, edit the DB system, change the configuration, and start the DB system.

Answer: D

Explanation:
To change the configuration of a high-availability DB system, you must follow these steps:
* Stop the DB system: This ensures that the system is in a consistent state and that no transactions are being processed during the configuration change.
* Edit the DB system: Make the necessary changes to the configuration.
* Change the configuration: Apply the configuration changes.
* Start the DB system: Restart the system to apply the new configuration settings.

NEW QUESTION # 60
Which operation is necessary before enabling a MySQL HeatWave cluster?

A. Start Cloud Shell in OCI Console connected to the DB system's network.
B. Offload the data to object storage to facilitate reloading into the cluster.
C. Create all the schemas and tables in the DB system but do not load the data.
D. Create a DB system with a HeatWave shape.

Answer: D

Explanation:
Before enabling a MySQL HeatWave cluster,you must create a DB system with a HeatWave shape(Answer D). The HeatWave shape includes the necessary resources and configuration to support the HeatWave in-memory query accelerator.
Steps:
* Create a MySQL DB system in OCI Console.
* Choose a HeatWave shape during the DB system creation process.
* Once the DB system is created, you can enable and configure the HeatWave cluster.
References:
* MySQL HeatWave Documentation

NEW QUESTION # 61
You want to change the configuration of an active stand-alone DB system. The DB system is configured as the target of a channel, and the channel is currently active.
Which sequence of steps must you perform?

A. Edit the DB system and change the configuration.
B. Delete the channel, edit the DB system, change the configuration, and re-create the channel.
C. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
D. Stop the channel, edit the DB system, change the configuration, and start the channel.

Answer: D

Explanation:
To change the configuration of an active stand-alone DB system that is configured as the target of a channel, and the channel is currently active, you must:
D:Stop the channel, edit the DB system, change the configuration, and start the channel: This sequence ensures that no data inconsistency or replication issues occur while the configuration changes are being applied.

NEW QUESTION # 62
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