We need to transfer the schema operations master role if the domain controller that currently hosts the role is inadequate, has failed, or is being decommissioned. The schema master is a forest-wide operations master (also known as flexible single master operations or FSMO(FIZMO in pronounciations) role.
Transfer the schema master
Open the Active Directory Schema snap-in.
In the console tree, right-click Active Directory Schema, and then click Change Active Directory Domain Controller.
In the Change Directory Server dialog box, under Change to, click This domain Controller or AD LDS instance.
In the list of domain controllers, click the name of the domain controller to which you want to transfer the schema master role, and then click OK.
In the console tree, right-click Active Directory Schema, and then click Operations Master. The Change Schema Master box displays the name of the server that is currently holding the schema master role. The targeted domain controller is listed in the second box.
Click Change. Click Yes to confirm your choice. The system confirms the operation. Click OK again to confirm that the operation succeeded.
Click Close to close the Change Schema Master dialog box.