Hmm unless you change the installed clients you DBD::Oracle should still work. 
as 11->12 should work
If you are having problems you most likely will have to recompile DBD::Oracle 
against the new client

Checking DBD::Oracle I see it hasn't seen an update for at least 4 years or so 
and therefor not sure if you will need to re-compile and they do not list a 
compatibly chart anymore  so not 100% sure on the aboce.  Hopefully your 
DBD::Oracle was copiled against the 11.2 client and therefor you should have a 
seemless update to the 12 server.

cheers
John
________________________________
From: tim.bu...@pobox.com <tim.bu...@pobox.com>
Sent: April 10, 2018 11:02 AM
To: dbi-users@perl.org
Cc: Seidler, Reinhard
Subject: (Fwd) Perl with Oracle 12c

----- Forwarded message from "Seidler, Reinhard" 
<reinhard.seid...@amtc-dresden.com> -----

Date: Tue, 10 Apr 2018 12:16:09 +0000
From: "Seidler, Reinhard" <reinhard.seid...@amtc-dresden.com>
To: "tim.bu...@pobox.com" <tim.bu...@pobox.com>
Subject: Perl with Oracle 12c

   Hi Tim,

   We develop Perl applications connecting and working with Oracle database 
(DBD:Oracle). So far it was
   Oracle version 11. Now the database will be migrated to 12.2.0.1. How should 
we deal with that? Any
   answer would be appreciated.

   Thanks in advance.

   With best regards
   Reinhard

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