Explain about Active Directory database.

The information stored in the Active Directory is called Active Directory database.
The information stored in the Active Directory (i. e., Active directory database) on every
domain controller in the forest is partitioned into three categories. They are
· Domain Partition
· Configuration Partition
· Schema Partition

Domain Partition
The domain partition contains all of the objects in the directory for a domain.
Domain data in each domain is replicated to every domain controller in that domain, but
not beyond its domain.

Configuration Partition
The configuration partition containes all the information of all domains in the forest.

Schema Partition
The schema partition contains all object types and their attributes that can be
created in Active Directory. This data is common to all domain controllers in the domain
tree or forest, and is replicated by Active Directory to all the domain controllers in the
forest.