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user522961 wrote:it depends.
on 11g R2 I have some manually copied databases. I back up them in nocatalog mode. Then in controlfiles.
I heard about DBID and then I looked at documentation that says :
Then can we say DBID is not a concern/problem for me because I do not have a RMAN repository and it is not necessary to change DBID of copied databases ?
Because Recovery Manager (RMAN) distinguishes databases by DBID, you could not register a seed database and a manually copied database together in the same RMAN repository.
answer depends upon what you are going to restore where.
DBID must be unique on single system.
thank you. I want to restore on the same physical server.