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need a spare active directory user attribute

I need to add a unique id to each active directory user account
should I try to find an existing attribute to use or extend the schema and create a new one
is it safe to extend schema and how can I do this?
or how can I find an attribute that is never used?
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dougdog
Asked:
dougdog
1 Solution
 
172pilotSteveCommented:
Why not use the "ObjectGUID" or "SID" for the user?  Those are both definitely unique..
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Joseph MoodyBlogger and wearer of all hats.Commented:
Extending the schema is as safe as working in the registry. Perfectly fine if you know what you are doing and plan ahead of time.

I would just use a spare attribute though. Info is a good one.
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dougdogAuthor Commented:
Why not use the "ObjectGUID" or "SID" for the user
these are both in use
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MaheshArchitectCommented:
You can fill values with employeeID OR employeeNumber attribute which are already present in AD and also unique with each account and some applications may use this for account query.  
You can think addition of schema attribute only if required by any application to query active directory.
It will require lot of perfect scripting work.It may affect AD schema if programmed wrongly.
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dougdogAuthor Commented:
how can I search the whole AD to make sure the attribute I choose is def not used
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MaheshArchitectCommented:
You can query AD for perticular attribute
you can user Bulk AD users from wisesoft and can search any custom attribute for single user or all users in entire domain.
There is option called "Properties to load" there.
You can enter any custom attribute there
For Ex.employeeNumber OR employeeID
also u can export search results to excel or csv
the tool can downloaded as freeware from below site
http://wisesoft.co.uk/software/bulkadusers/default.aspx

OR

alternatively you can check through adsiedit.msc if u have 2003 DC or you can use attribute editor if you have 2008 DC
hope that helps
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dougdogAuthor Commented:
so employee id or info are def not used and would be safer to use that creating a new one?
also do I need to add this to the GC list to be replicated
or is it already in there
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MaheshArchitectCommented:
EmployeeID and EmployeeNumber are the attribute which are not written automatically during user creation.
Also these attributes are not replicated with global catalog.
If you want you can add to replicated attributes through GC.
Please check below article
http://msdn.microsoft.com/en-us/library/windows/desktop/ms675160(v=vs.85).aspx
Below article is written for windows 2000, but still applies to later versions also.
http://support.microsoft.com/kb/248717
Below is the list of attributes replicated with GC
http://support.microsoft.com/kb/257203
Hope that helps
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