Groups have the following advantages:
Static groups are the only standards-based grouping mechanism. Static groups are therefore interoperable with most client applications and LDAP servers.
If you only need to enumerate members of a given set, static groups are less costly. Enumerating members of a static group by retrieving the member attribute is easier than recovering all entries that share a role. In Directory Server, significant performance improvements have been made for large multi-valued attributes. Equality matching and modify operations on these attributes are greatly improved, specifically in relation to static groups. Membership testing for group entries has also been improved. These improvements remove some of the previous restrictions on static groups, specifically the restriction on group size.
Directory Server also provides group membership directly in user entries, with the isMemberOf operational attribute. This feature applies to static groups only but includes nested groups. For more information, see Managing Groups in Sun Directory Server Enterprise Edition 7.0 Administration Guide.
Static groups are preferable to roles for management operations such as assigning and removing members.
Static groups are the simplest mechanism for assigning a user to a set or removing a user from a set. Special access rights are not required to add the user to the group.
The right to create the group entry automatically gives you the right to assign members to that group. This is not the case for managed and filtered roles. In these roles, the administrator must also have the right to write the nsroledn attribute to the user entry. The same access right restrictions also apply indirectly to nested roles. The ability to create a nested role implies the ability to pull together other roles that have already been defined.
Dynamic groups are preferable to roles for use in filter-based ACIs.
If you only need to find all members based on a filter, such as for designating bind rules in ACIs, use dynamic groups. Although filtered roles are similar to dynamic groups, filtered roles trigger the roles mechanism and generate the virtual nsRole attribute. If your client does not need the nsRole value, use dynamic groups to avoid the overhead of this computation.
Groups are preferable to roles for adding or removing sets into or from existing sets.
If you want to add a set to an existing set, or remove a set from an existing set, the groups mechanism is simplest. The groups mechanism presents no nesting restrictions. The roles mechanism only allows nested roles to receive other roles.
Groups are preferable to roles if flexibility of scope for grouping entries is critical.
Groups are flexible in terms of scope because the scope for possible members is the entire directory, regardless of where the group definition entries are located. Although roles can also extend their scope beyond a given subtree, they can only do so by adding the scope-extending attribute nsRoleScopeDN to a nested role.