Which file decide EM to choose which db(10g) ?

I have 2 instances on same machine to be managed by em db console, which file decide EM to choose which db(10g)?
from some document: you can also use DBCA after the installation to configure Database Control for a database.
but I did not see this option in my 10g DBCA.
Thanks.

Don't expect to find a file that configures the so called 'pointer' Enterprise Manager creates a directory where it stores the configuration under a directory named sysman/conf. In your particular case I see you have three instances which have been configured to be managed by Enterprise Manager DB Control Console, the name of your host is m92364 and the three instances are OMFTESET, orcl and TEST. So you only need to change the ORACLE_SID environment variable to 'point' to each oracle Enterprise Manager configuration; actually you don't perform any other task, it is the oemctl command who performs this on your behalf.
~ Madrid
http://hrivera99.blogspot.com/

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