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If you are asking about the database hosting the Enterprise Manager repository, the 11gR2 is supported. See Enterprise Manager Cloud Control Basic Installation Guide 12c Release 2 (18.104.22.168)
The existing, certified Oracle Database must be one of the certified databases listed in the Enterprise Manager certification matrix available on My Oracle Support, or a database instance created with a preconfigured Oracle Management Repository (Management Repository) using the database templates offered by Oracle.
To access the Enterprise Manager certification matrix, follow the steps outlined in Appendix E.
For information about creating a database instance with a preconfigured Management Repository using the database templates offered by Oracle, refer to Appendix D.
The database can be on a local or remote host, and if it is on a remote host, it must be monitored by Oracle Management Agent. However, Oracle Real Application Clusters (Oracle RAC) databases must only be on a shared disk.