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/Cannot upgrade RDS PostgreSQL 9.5 to 12.5/

Cannot upgrade RDS PostgreSQL 9.5 to 12.5

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As we are forced to upgrade PostgreSQL 9.5 to 12.5, I have activated the maintenance upgrade which has started to work and also took the instance down for a while. After finishing it change status to Available however PostgreSQL version was still 9.5. There's no way for seeing what went wrong.

What should we do now?

1 Answers
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I would say, starting point would be to check your RDS Events and may be logs as well. Before any upgrade, there is a PreUpgrade checks that happen and may be, those checks have failed for some reason which you can find in RDS Events of that instance.

answered 3 months ago
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