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Q1: Does enabling performance insights on a running mysql rds require restart of the rds instance?
Answer1: Turning Performance Insights on and off doesn't cause downtime, a reboot, or a failover.
Q2: After enabling it, will it cause any performance issues?
Answer2: The Performance Insights agent consumes limited CPU and memory on the DB host. When the DB load is high, the agent limits the performance impact by collecting data less frequently.
Source: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.Enabling.html
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