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I need create a copy of an Oracle 12.2 instance (Oracle Restart) running on an Linux VM. The new instance needs a charset conversion from WE8ISO8859P1 to UTF8

I started by creating a clone of the VM that is now up and running.

I was thinking about following these steps:

  1. expdp FULL=YES from the cloned machine to a safe storage location
  2. destroy the database from the clone using DBCA
  3. create a new database on the clone using DBCA setting UTF-8 as charset
  4. impdp FULL=YES from the previous exported datapump

I have some doubts about the impdp FULL=YES... will this work or will it overwite some configuration on SYS or other Oracle maintained schemas with some values that still refers to WE8ISO8859P1 charset?

Will this work or should I exclude all the Oracle maintained schemas from the impdp?

  • Watch out, your varchar2 columns may not be wide enough to hold a string converted from we8iso8859p1 to UTF-8. – Gerard H. Pille Mar 19 at 20:59
  • Sure, the character length semantic is a topic I do know very well ad I already modified on the source database on both objects definition and PL/SQL code variable declaration – Massimo Pasquini Mar 20 at 10:08
  • OK, couldn't tell from your profile what your experience was. Hope you are in good health, better than your avatar. – Gerard H. Pille Mar 20 at 10:59
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On export the documentation states:

A full export does not, by default, export system schemas that contain Oracle-managed data 
and metadata. Examples of system schemas that are not exported by default include 
SYS, ORDSYS, and MDSYS. 

If you want to be absolutely sure I would switch to a schema-mode import instead. You can still use the full export. That way you specify what schemas you want to import.

Regards, Daniel

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