Upgrade to 12c database, what type of issues were reported

We are thinking about upgrade to 12c database. Would like to find out what type of issues were reported after database from 11g to 12c. We want to prepare any possible issues that might happen.
Thanks everyone for your inputs.

I believe your database version is 11.2.0.2.0, since it is the minimum required version for 12c.
You can apply latest PSU patch to 12c oracle home which has many bug fixes for 12c.
In case your environment is a critical production system and you can perform testings to judge how the performance will be after upgrade.
For that you can make use of "Real Application Testing" concept which is called as Database replay
It works as below
1) We will be creating test database instance having same configuration as production (hardware, resource)
2) Invoke database replay capture activity at source database, it will start capturing database metrics. Perform necessary operations which should be tested in upgraded instance. For example, Load tests, EOD operation (Performance issue will create more impact to these tests)
Capture mechanism will record necessary details and stores it in source database server. We will be notified about the location.
Capture activity's overhead is very less. It will not impact normal db operations.
3) Once testing is over move the captured results to test machine
4) Upgrade test instance to 11.2.0.3 version (in our case)
5) Invoke database reply to apply the captured tests (production) to test instance.
6) Execute replay reports that will give good comparison details on Performance, Data variation, etc
Data variation gives comparison between query results in source and test instance.
Thanks,
Krishna

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