OAM integrates with OID for user mgt. Oracle Database stores user identities and privileges and is integrated with OAM for authentication and authorization. OID stores and manages user identities, groups, and privileges and serves as central user repository. AD is integrated with Oracle IAM to leverage existing user accounts and groups. OVD has a unified view of multiple identity repositories like OID, AD, databases and allows applications to access identities without knowing the underlying data source. The user authenticates to OAM, which validates credentials against OID or AD, and OAM retrieves user's groups and privileges from OID or AD. Finally, OAM authorizes user's access to application based on policies stored in OAM.