You have a DRG attached to a VCN containing your MySQL HeatWave DB system. You need to restrict access to the database from another VCN within the same region. Suggest most effective way to achieve this using DRG and security list configurations?
Your VCN already contains multiple subnets for various purposes. What additional resource should you configure within the chosen subnet before provisioning your MySQL HeatWave DB system?
Your application is configured to connect to the primary instance of your MySQL HeatWave service. You want to switch to a read replica for read-heavy workloads. Which approach is recommended for minimizing application downtime during the switch?