Grid Control repository is run on SYSMAN account - it is created and populated while installing Grid Control or Database Control option of database installation.
Agents connect to database targets by DBSNMP accounts - those accounts are created always during database installation. However if You have not chosen Database Control option, it is locked and password stays set to change_on_install. Those accounts are granted with OEM_MONITOR role which allows for SELECT ANY DICTIONARY and usage of few other privileges (managing statistics and queues, creating jobs, managing advisors) needed for performing basic administration tasks.
However to access part of the console one needs to log on to a chosen database once again - this time directly from OMS using some account - it can be also DBSNMP, however one might be not allowed to perform all possible on console operations.
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