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- The domain controller assigned to control all updates to the schema within a forest. At any time, there can be only one schema master in the forest. See also domain controller, forest, schema.
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- The master service that maintains the structure of the forest database and authorizes schema changes.
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- Domain Controllers, Domain Naming Master, Infrastructure Master, Operation Masters (OM), Primary Domain Controller Emulator (PDC), Relative ID (RID), Single-master operations