What are the things we need to take care while moving from 11g to 12c.

Dear All,
One of my client having the application running on 11g and now he wants to move it on 12c.
Now he is asking to me that, what are the things will not work or impacted due to this. Any code level changes, syntax, functions etc are working in 11g and now there is difference or not working in 12c. Could you please help me in this.
Is there any document for all these thing. I searched on google but not able to find any specific doc.
Thanks in advance.
Regards,
ganesh

Gaurav_91 wrote:
Hi,
Moving from 11g to 12c will not impact anything.
Database in 11g will now act as PDB's in 12c.
And what makes you say so? What about the changes/fixes done in the optimizer that would alter the plans? What about if the client wants to use in-memory database option? And your statement that database in 11g will now act as PDB in 12c doesn't make any sense. What if the client is not willing to move to multitenancy? What about the scripts that are running in 11g without any issues and suddenly, will break in 12c  due to PDB's ? Do you have any technical reference to validate your claim that there won't be any impact ?
Aman....

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