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The Active Directory support files are listed below. These are the files that you specify a location for when you promote a server to a domain controller:

• Ntds.dit (NT Directory Services): Ntds.dit is the core Active Directory database. This file on a domain controller lists the naming contexts hosted by that particular domain controller.
• Edb.log: The Edb.log file is a transaction log. When changes occur to Active Directory objects, the changes are initially saved to the transaction log before they are written to the Active Directory database.
• Edbxxxxx.log: This is auxiliary transaction logs that can be used in cases where the primary Edb.log file fills up prior to it being written to the Ntds.dit Active Directory database.
• Edb.chk: Edb.chk is a checkpoint file that is used by the transaction logging process.
• Res log files: These are reserve log files whose space is used if insufficient space exists to create the Edbxxxxx.log file.
• Temp.edb: Temp.edb contains information on the transactions that are being processed.

Schema.ini: The Schema.ini file is used to initialize the Ntds.dit Active Directory database when a domain controller is promoted.