CREATE CONTROLFILE REUSE DATABASE OR SET DATABASE

Question

Hi Guys,
I'm doing a db migration from one mount point to another mount point in the same server.
The location of controlfile, log files and datafiles will be change.
I have updated the new controfile location in my pfile and startup nomount.
When creating the controfile to reflect the new location of redo logs / datafiles, should i use "reuse" or "set" syntax? Can explain what's the diff between the 2? Have read up the document but not able to understand.
thanks

Answer 1

Here not only controlfile but also data & redo log files That's irrelevant. The REUSE in the CREATE CONTROLFILE statement applies only to the controlfile.
(REUSE for Datafiles is in ALTER ... CREATE ... DATAFILE .... etc).
REUSE in CREATE CONTROLFILE is to specify that existing controlfiles are to be overwritten.
SET in CREATE CONTROLFILE is to specify that the DB_NAME is being changed from whatever is the existing name in datafile headers.
They are two different clauses for two different purposes. It is not an "either/or" decision.
I can REUSE with SET.
I can REUSE without SET.
I can exclude REUSE but use SET.
I can exclue REUSE and exclude SET.
Hemant K Chitale