Typically, OIA would use the global user import will use the Username as the authoritative information for that identity. Based on different scenarios, OIA will treat this in a different manner.
Scenario One: Import 1 user
Scenario Two: Import 1 user though surname changes
Scenario Three: Import 2 users
Scenario Four: Import 1 user, then another user (non-case sensitive UN)
Scenario Five: Import 1 user, then another user (case sensitive UN)
Scenario One: Import 1 user
Username: C000020
Name: Daniel Redfern
You will find when you import the user, and the user does not exist within the globaluser table, it will create an identity as normal. If you import the same user and nothing has changes, OIA will acknowledge the existing user and will reframe from creating a new one
Scenario Two: Import 1 user though surname changes
You import the data feed, though the user gets married. (Daniel Redfern marries and is now called Daniel Rogers) If you import a new identity data feed this time, with the surname being the only data that changed, OIA will acknowledge that and simply update the surname, still with only 1 globaluser account.
Scenario Three: Import 2 users
Username: C000020
Name: Daniel Redfern
Username: c000020
Name: David Rogers
This is where the ruling changes, because if you import 2 users, both with the same username though different because it's case sensitive, OIA will treat the last user within the globaluser feed and only create one identity within globalusers table.
Scenario Four: Import 1 user, then another user (non-case sensitive UN)
Username: C000020
Name: Daniel Redfern
Username: C000020
Name: David Rogers
Same scenario as #3, though this time the globaluser data is separated into two file. If you import the file one first with Daniel Redfern in, it will create the globaluser. If you then import the second feed, which contains only David Rogers with the same username, it will simply update the 'Daniel Redfern' globaluser (thinking this person has changed personal information
Scenario Five: Import 1 user, then another user (case sensitive UN)
Username: C000020
Name: Daniel Redfern
Username: c000020
Name: David Rogers
Same scenario as #4, though this time the username information is case sensitive. OIA will treat this as a separate user within the globalusers table with the idea that the globaluser import is taken from 2 separate identity repositories.
Conclusion
OIA is case sensitive on globalusers, though only if it's imported into two separate data feeds.
About the author
Daniel is a Technical Manager with over 10 years of consulting expertise in the Identity and Access Management space.Daniel has built from scratch this blog as well as technicalconfessions.com
Follow Daniel on twitter @nervouswiggles
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