Active Directory Database Partition and Structure

Active Directory Database Partition:
1.       Schema Partition: (Object Classes)
Only one schema partition exists per Active Directory forest. Schema partition is stored on all Domain Controllers within a forest. It contains definitions of all attributes and objects t that can be produced in the directory, and the rules for creation and manipulating them. Schema partitions information is replicated to all domain controllers in the attribute definitions.
·         It defines the Active Directory database for all the domains in the forest.
·         Defines all the objects in the Active Directory Database.
·         Changes to the Schema affects all domains in the forest.
·         Schema determines what can be stored in Database.

2.       Configuration Partition:

This partition contains data to deal with the configuration of the forest. Site information under sites and services is found here.

·         Information about Active Directory partitions is found here.
·         Data in this partition applies to all the forest.
·         Holds Active Directory structure sites, one partition in whole forest.

3.       Domain Partition:

Many Domain partitions can exists per forest, information about users, computers and organizational units.

·         It contains only domain data.
·         Active Directory Users and Computers data gets replicated to that domain only.

4.       Application Partition:

If any application wants to store information in Application Partition, it can create its own application partition to store information.
Example: Integrated DNS

·         There can be more than one application partition
·         Replication can be to any DC in the forest
·         It can be stored on one Domain Controller or all Domain Controller’s.
·         Application partitions store information about applications in Active Directory.

Note: If DNS (Domain Name System) is integrated with AD: Two partitions for DNS Zones is available
                All domain controllers and DNS servers in a forest receive a replica of this partition. A forest wide application partition stores the forest zone data.
                Unique for each domain

5.       Global Catalog:

It contains partial replica of all objects in the forest replicated to all Global Catalog’s in the forest. Global catalog is a distributed repository that contains a searchable, partial copy of evening object is every domain. This partition is stored on a DC designated as a global catalog server role., replication topology used is multiple master replication

·         It holds read/write attribute of its local domain, but readonly for forest domains.
·         Partial Attribute Set (PAS) Only limited set of attributes is included for each object.

Active Directory partitions divide up the AD Database for administration and replication accuracy.
Global Catalog
All GC's in the forest
All DC's in the forest
Any specified DC's in the forest
All DC's in the forest

Active Directory Structure
1.       Logical Structure: (Hierarchical Structure)
Contains Organization Unit (OU), Trees and Forest
2.       Physical Structure:
Sites (including Physical Internet Address subnets) and Domain controllers.

NTDS.DIT full form: New Technology Directory Service. Directory Information Tree

2 Responses to “Active Directory Database Partition and Structure”

27 January 2015 at 07:09

Appreciated for the information shared which is useful

Prashant Shalgar said...
27 January 2015 at 08:28

Awesomely written bro

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