Netscape DIRECTORY SERVER 6.01 - ADMINISTRATOR Administrator's Manual page 451

Table 15-30 Details of UID Uniqueness Plug-In (Continued)
Plug-in Name UID Uniqueness plug-in
Configurable Enter the following arguments:
Arguments
uid
"DN"
"DN"...
if you want to check for uid attribute uniqueness in all listed
subtrees.
However, enter the following arguments:
attribute="uid"
MarkerObjectclass = "ObjectClassName"
and optionally
requiredObjectClass = "ObjectClassName"
if you want to check for uid attribute uniqueness when adding or
updating entries with the requiredObjectClass, starting from the
parent entry containing the ObjectClass as defined by the
MarkerObjectClass attribute.
N/A
Dependencies
Performance This plug-in may slow down Directory Server performance.
Related Information
In a multimaster replication environment, the UID Uniqueness
plug-in will not work at all and should therefore not be enabled.
If you try to add a new entry to a server where the UID Uniqueness
plug-in is enabled and a referral has been created in a subtree, then
the UID Uniqueness plug-in will not work. It will not work because
if it sees any other error apart from noSuchObject (meaning that the
entry does not already exist), which it will do if a referral is created,
then it will return an operations error preventing you from adding
your new entry. To prevent being blocked by such an operations
error, disable the plug-in on the server where you created the
referral. If, however, you still want to run a UID Uniqueness check,
make sure that you only activate the plug-in on the last of the
referred to servers to prevent it from blocking the referral
mechanism.
Chapter 17, "Using the Attribute Uniqueness Plug-In."
Further Information
Server Plug-in Functionality Reference
Chapter 15 Administering Directory Server Plug-Ins 451