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If the master definition site of a master group becomes unavailable or you simply want to relocate the master definition site for the group, then complete the following steps to relocate the master definition site:
In Enterprise Manager, connect to the Database Instance Home page as the replication administrator.
Click Data Movement.
Under the Advanced Replication section, click Manage.
The Administration Overview page appears.
Under the Multimaster Replication section, click the number link next to Master Groups to open the Master Groups page.
Select the target master group that contains the master site that you want to make the new master definition site and click Edit.
The General subpage of the Edit Master Group page appears.
Click Master Sites.
The Master Sites subpage of the Edit Master Group page appears.
Click Change next to the Master Definition Site field.
The Change Master Definition Site page appears.
When you relocate the master definition site for a master group, you can choose to notify:
The current master definition site.
Disable this setting when the current master definition site is unavailable.
All other master sites in the replication environment.
Select the new master definition site from the list of Available Master Sites.
Click OK.
Click Apply at the bottom of the Master Sites page.
API Equivalent: DBMS_REPCAT.RELOCATE_MASTERDEF