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I upgraded my RDS instance (db.t2.medium) from Postgres 9.5 to 9.6 couple of days back. Since the upgrade, the CPU usage was almost 100% all the time. This brought down my application. Presuming that the problem is with the 9.6 version, I did another upgrade to 10.6. It got better but still considerably higher than the CPU usage for the original 9.5 version.

I haven't changed the application code during the upgrade. How can I check the reason for the increased CPU usage and possibly fix it?

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