The "micro" instance types are no longer supported with RDS Oracle as of Oracle Database 12.2. You will need to scale to a db.t2.small or similar before you will be able to upgrade. To see a full list of supported instance classes please refer to our documentation.
Hope this helps. Thanks!
Turns out micro instances are not supported with v12.2. You need minimum small. This is a shame as they cost much more.
Unfortunately. But not a huge surprise. I believe Micro instances were always documented as not meeting Oracle's configuration requirements and only for use for limited testing. 12.2 probably had just enough increase in resource requirements to cause performance to fall off a cliff on the memory constrained Micros.
Edited by: HalTemp on Mar 22, 2019 5:07 AM
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